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Original Article

Prevalence of Clonorchis sinensis Metacercariae in Freshwater Fish from Three Latitudinal Regions of the Korean Peninsula

Shin-Hyeong Cho1, Woon-Mok Sohn2, Byoung-Kuk Na2, Tong-Soo Kim3, Yoon Kong4, Keeseon Eom5, Won-Seok Seok6, Taejoon Lee6
The Korean Journal of Parasitology 2011;49(4):385-398.
Published online: December 16, 2011

1Division of Malaria and Parasitic Diseases, National Institute of Health, Centers for Disease Control and Prevention, Osong 363-951, Korea.

2Department of Parasitology and Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju 660-751, Korea.

3Department of Parasitology and Inha Research Institute for Medical Sciences, Inha University College of Medicine, Incheon 400-712, Korea.

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Corresponding author (wmsohn@gnu.ac.kr)
• Received: September 20, 2011   • Revised: October 31, 2011   • Accepted: November 3, 2011

© 2011, Korean Society for Parasitology

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  • A large-scale survey was conducted to investigate the infection status of fresh water fishes with Clonorchis sinensis metacercariae (CsMc) in 3 wide regions, which were tentatively divided by latitudinal levels of the Korean peninsula. A total of 4,071 freshwater fishes were collected from 3 regions, i.e., northern (Gangwon-do: 1,543 fish), middle (Chungcheongbuk-do and Gyeongsangbuk-do: 1,167 fish), and southern areas (Jeollanam-do, Ulsan-si, and Gyeongsangnam-do: 1,361 fish). Each fish was examined by the artificial digestion method from 2003 to 2010. In northern areas, only 11 (0.7%) fish of 2 species, Pungtungia herzi and Squalidus japonicus coreanus from Hantan-gang, Cheolwon-gun, Gangwon-do were infected with av. 2.6 CsMc. In middle areas, 149 (12.8%) fish were infected with av. 164 CsMc. In southern areas, 538 (39.5%) fish were infected with av. 159 CsMc. In the analysis of endemicity in 3 regions with an index fish, P. herzi, 9 (6.2%) of 146 P. herzi from northern areas were infected with av. 2.8 CsMc. In middle areas, 34 (31.8%) of 107 P. herzi were infected with av. 215 CsMc, and in southern areas, 158 (92.9%) of 170 P. herzi were infected with av. 409 CsMc. From these results, it has been confirmed that the infection status of fish with CsMc is obviously different among the 3 latitudinal regions of the Korean peninsula with higher prevalence and burden in southern regions.
  • Key words: Clonorchis sinensis, metacercaria, freshwater fish, prevalence, latitudinal level
Recent trends of helminthic infections in the Republic of Korea are characterized by a remarkable decrease of soil-transmitted nematodiases and moderate endemicity of foodborne trematode (FBT) infections. Among FBT infections prevailing in the Republic of Korea, clonorchiasis has been known as the most important endemic disease, and its endemicity has maintained at relatively high levels in riverside areas [1-6]. Especially, in 1981, Seo et al. [1] reported prevalence rates of clonorchiasis among the residents in 7 major rivers, Nakdong-gang (River) (40.2%), Youngsan-gang (30.8%), Seomjin-gang (17.3%), Tamjin-gang (15.9%), Han-gang (15.7%), Gum-gang (12.0%), and Mangyeong-gang (8.0%). In 2008, Cho et al. [5] reported the egg positive rates of residents living in 4 river basins, Nakdong-gang (17.1%), Seomjin-gang (11.2%), Youngsan-gang (5.5%), and Gum-gang (4.6%), located in southern parts of Korea. Although the Korea Association of Health Promotion (KAHP) and the Korea Center for Disease Control and Prevention (KCDCP) have been performing control programmes of clonorchiasis for more than 20 years, clonorchiasis is still prevalent throughout the country [3,6].
Clonorchiasis is contracted by eating raw or undercooked fish intermediate hosts containing the metacercariae of C. sinensis. As the second intermediate hosts of C. sinensis, total 40 species of freshwater fishes have been reported in Korea [2,7]. Among them, some species, such as Pseudorasbora parva, Pungtungia herzi, Sarcocheilichthys spp., Squalidus spp., and Pseudogobio esocinus, have been known as the more susceptible hosts to cercariae, and they have sometimes enormous amount of metacercariae [8-12].
On the other hand, the survey on the infection status of FBT metacercariae in intermediate hosts is one of the important epidemiological indices together with surveys on adult worm infections in the definitive and reservoir hosts. Many Korean workers have investigated the infection status of C. sinensis metacercariae (CsMc) in fishes from various endemic areas to estimate the endemicity of clonorchiasis [8,9,11-17]. Especially, Kim et al. [12] investigated 677 freshwater fish of 21 species to know the current infection status with CsMc in Korea. However, large-scale surveys have not been conducted to compare the prevalence and density of CsMc in freshwater fishes collected by different latitudinal levels of the Korean peninsula. Therefore, in the present study, we investigated on the infection status of CsMc in freshwater fish from 3 wide regions, which were tentatively divided by the latitudinal levels of the Korean peninsula.
Surveyed areas
Surveyed areas were largely divided into 3 latitudinal regions of the Korean peninsula (Fig. 1). The northern area was comprised of 7 administrative regions of Gangwon-do, ① Inje-gun, ② Hongcheon-gun, ③ Cheolwon-gun, ④ Yanggu-gun, ⑤ Yangyang-gun, ⑥ Youngweol-gun, and ⑦ Samcheok-si, which are located over 37° North Latitude. The middle area contained 10 regions of Chungcheongbuk-do (⑧ Gum-gang in Okcheon-gun, ⑨ Cheong-cheon in Goisan-gun, and ⑩ Daecheong-ho), and Gyeongsangbuk-do (⑪ Ahndong-si, ⑫ Sangju-si, ⑬ Bonghwa-gun, ⑭ Yecheon-gun, ⑮ Youngyang-gun, ⑯ Youngdeok-gun, and ⑰ Gunwi-gun), which are located between 36° and 37° North Latitude. The southern area was comprised of 8 administrative regions of Jeollanam-do (⑱ Gokseong-gun, ⑲ Gurye-gun, ⑳ Naju-si, ㉑ Gangjin-gun, ㉒ Jangheung-gun, and ㉓ Boseong-gun), Ulsan Metropolitan City (㉔ Taehwa-gang) and Gyeongsangnam-do (㉕ Sancheong-gun), which are located below 36° North Latitude.
Freshwater fishes examined
In western parts of Gangwon-do, we collected 678 freshwater fishes (36 species) from 4 localities, Soyang-gang (Inje-gun in October 2003 and April 2004), Hongcheon-gang (Hongcheon-gun in October 2003, and July and October 2010), Hantan-gang (Cheolwon-gun in April 2005 and October 2010), and Hwa-gang (Cheolwon-gun in June 2010) in Gangwon-do. We also collected 865 fishes (32 species) from 5 localities of eastern parts of Gangwon-do, Sooip-cheon (Yanggu-gun), Namdae-cheon (Yangyang-gun), Dong-gang (Youngweol-gun), Osip-cheon, and Gagok-cheon (Samcheok-si) 2 times in June and October 2009. The numbers and species of fish examined are shown in Tables 1 and 2.
In middle regions, a total of 451 fishes (32 species) were collected from 3 sites, Gum-gang (Okcheon-gun in April and September 2006), Cheong-cheon (stream in Goisan-gun on June 2003) and Daecheong-ho (Lake, on June 2003), located in Chungcheongbuk-do. The numbers and species of fish examined are shown in Table 3. To investigate the infection status of CsMc in fishes from the upper reaches of Nakdong-gang, we collected total 716 freshwater fishes (35 species) from 7 localities, Ahndong-si, Sangju-si, Bonghwa-gun, Yecheon-gun, Youngyang-gun, Youngdeok-gun and Gunwi-gun, Gyeongsangbuk-do in October and November, 2008 (Table 4).
In western parts of southern localities, 452 freshwater fishes (35 species) were collected from 6 localities, Seomjin-gang (Gokseong-gun in September 2004 and May 2005) (Gurye-gun in September 2004), Youngsan-gang (Naju-si in October 2005), Tamjin-gang (Gangjin-gun and Jangheung-gun, in October 2005) and Boseong-gang (Boseong-gun in October 2005), in Jeollanam-do. The numbers and species of fish examined are shown in Table 5. In eastern parts, we also collected 909 freshwater fishes (24 species) from Taehwa-gang (Ulsan Metropolitan City in April and September 2006) and Yangcheon-gang (Sancheong-gun in each October of 2006 and 2007, June and July 2010) in Gyeongsangnam-do (Table 6).
Examination methods
All collected fishes with ice were transferred to the laboratory of the Department of Parasitology, Gyeongsang National University School of Medicine, Jinju, Korea. After identification of fish species [18], they were individually ground with a mortar with a pestle or a grinder. Each ground fish meat was mixed with artificial gastric juice and the mixture was incubated at 36℃ for 2-3 hr. The digested material was filtered with 1×1 mm of mesh, and washed with 0.85% saline untill the supernatant is clear. The sediment was carefully examined under a stereomicroscope. The metacercariae of C. sinensis were collected based on their general features [7], and they were counted to get hold of the infection densities by fish species.
Infection status of freshwater fish from northern areas
The metacercariae of C. sinensis were found in only 2 fish species, P. herzi and Squalidus japonicus coreanus, collected from Hantan-gang in Cheolwon-gun, Gangwon-do. Total 6 CsMc were detected in 3 out of 8 P. herzi examined in April, 2005. They were also detected in 6 (85.7%) of 7 P. herzi and both 2 of S. japonicus coreanus examined in October 2010. The metacercarial densities were 3.2 and 2.0 per infected fish. However, they were not found in fishes from 7 localities, Hongcheon-gang in Hongcheon-gun, Hwa-gang in Cheolwon-gun, Sooip-cheon in Yanggu-gun, Namdae-cheon in Yangyang-gun, Dong-gang in Youngweol-gun, and Osip-cheon and Gagok-cheon in Samcheok-si, Gangwon-do.
Infection status of freshwater fish from middle areas
A total of 50 CsMc were detected in 22 (10 species) of 356 freshwater fish (28 species) collected from Gum-gang, and total 27 metacercariae were found in 6 (3 species) of 53 fish from Cheong-cheon. Their infection status by fish species were as shown in Table 7. No CsMc were found in 42 fishes from Daecheong-ho.
CsMc were found in 3 (12.5%) of 24 P. herzi and only 1 (4.8%) Zacco platypus from Ahndong-si, and their average densities were 62 in P. herzi and only 1 in Z. platypus infected. They were also detected in all 6 P. herzi and only 1 of 2 Acanthorhodeus gracilis from Sangju-si, and their average densities were 11 in P. herzi and only 1 in A. gracilis infected. Total 46 CsMc were detected in 10 (35.7%) of 28 Squalidus gracilis majimae from Youngdeok-gun. However, CsMc were not found in other fishes from Bonghwa-gun.
A total of 68 CsMc were found in 9 (15.8%) out of 57 fish of 7 species, Ladislabia taczanowskii, Culter brevicauda, P. herzi, Z. platypus, Pseudogobio esocinus, Hemibarbus longirostris. and Hemibarbus labeo from Yecheon-gun. Total 31 (36.0%) fishes of 6 species, P. herzi, Squalidus chankaensis tsuchigae, Microphysogobio koeensis, Coreoleuciscus splendidus, Acheilognathus signifer and Z. platypus, out of 86 fish in 12 species from Youngyang-gun, were infected with 1-630 CsMc (av. 126 per fish). Among 136 fishes of 16 species collected from Gunwi-gun, 70 (51.5%) of 14 species were infected with 1-2,105 CsMc (av. 287). The infection status in fishes from Yecheon-gun, Youngyang-gun, and Gunwi-gun were detailed in Table 8.
Infection status of freshwater fish from southern areas
Among 191 fishes (22 species) from Seomjin-gang in Gokseong-gun, 42 (13 species) were infected with 2,496 CsMc (av. 59), and 37 fishes (9 species) from Seomjin-gang in Guryu-gun were infected with total 1,390 CsMc (av. 49). Their infection status by fish species were shown in Table 9.
A total of 1,831 CsMc (av. 80) were detected in 23 (9 species) of 65 freshwater fish (11 species) from Youngsan-gang in Naju-si. Among 58 fishes (11 species) from Tamjin-gang in Gangjin-gun, 39 (9 species) were infected with total 8,020 CsMc (av. 206), and a total of 162 CsMc (av. 32) were detected in 5 (4 species) of 18 freshwater fish (10 species) collected from Boseong-gang in Boseong-gun, Jeollanam-do. Infection status by fish species from 3 aforementioned regions were presented in Table 10. No CsMc were found in 52 fish from Tamjin-gang in Janghung-gun, Jeollanam-do.
Total 175 CsMc (av. 22) were detected in 8 (32.0%) of 25 S. chankaensis tsuchigae, and 5 CsMc in 3 (5.0%) Z. platypus collected from Taehwa-gang in Ulsan Metropolitan City. Total 381 (48.2%) of 790 fish from Yangcheon-gang in Sancheong-gun, Gyeongsangnam-do were infected with 1-2,345 CsMc (av. 187). The infection status by fish species and examination year were shown in Table 11.
Comparative prevalence and density of CsMc in freshwater fish from 3 regions
Among 1,543 fish from northern areas, only 11 (0.7%) of 2 species, P. herzi and S. japonicus coreanus, from Hantan-gang in Cheolwon-gun, were infected with total 29 CsMc (av. 2.6 per infected fish). Total 149 (12.8%) of 1,167 fish from middle areas were infected with total 24,384 CsMc (av. 163.7). Of 1,361 fish from southern areas, 538 (39.5%) were infected with total 85,428 CsMc (av. 158.8).
In an analysis with an index fish, P. herzi, total 25 CsMc (av. 2.8) were detected in 9 (6.2%) of 146 fishes from northern areas. Among 107 P. herzi from middle areas, 34 (31.8%) were infected with total 7,300 CsMc (av. 214.7). Total 158 (92.9%) of 170 P. herzi collected from southern areas were infected with total 64,674 CsMc (av. 409.3). On the other hand, no CsMc were found in 247 Z. platypus from northern areas. Of 223 Z. platypus from middle areas, 17 (7.6%) were infected with total 147 CsMc (av. 8.6). Total 13 (5.7%) of 228 Z. platypus from southern areas were infected with 139 CsMc (av. 10.7) (Table 12).
As the second intermediate hosts of C. sinensis, total 102 species of freshwater fishes (59 genera, 15 families) have been reported in China, including Taiwan, and total 40 species (31 genera, 6 families) have been listed in the Republic of Korea [7,19]. In the present study, CsMc were detected in 36 fish species. Of the 36 positive fish species, 28 have been already known as the second intermediate hosts of C. sinensis. However, 8 species, namely, Pseudopuntungia nigra, Rhynchocypris oxycephalus, Ladislabia taczanowskii, Microphysogobio longidorsalis, Acheilognathus majusculus, Acheilognathus koreensis, Acanthorhodeus macropterus, and Odontobutis platycephala, have not been listed in the Republic of Korea [7]. Among aforementioned 8 new fish hosts, R. oxycephalus is the same fish species with Phoxinus (or Morocco) oxycephalus, which has been already recorded. Accordingly, total 47 fish species (34 genera, 7 families) are included among the second intermediate hosts of C. sinensis in the Republic of Korea.
The successful sampling of subjected materials is one of the important factors in epidemiological surveys. A satisfactory fish collection is not easy in surveys like the present study. Fish ecologies are variable by natural conditions, and collected fish species are different by the catching methods (netting, casting net, and trapping) and timings. Although a total of 4,071 freshwater fish were examined in the present study, the fish examined more than 200 in number were only 7 species, i.e. Z. platypus (698), P. herzi (423), Zacco temminckii (344), Pseudogobio esocinus (236), C. auratus (204), Coreoperca herzi (203), and C. splendidus (200). Among 7 major fish species examined, Z. platypus and P. herzi were predominant, and they were evenly collected in each of 3 regions. Total 247, 223, and 228 Z. platypus and 146, 107, and 170 P. herzi were examined in each of 3 regions, northern, middle, and southern areas of Korea. Therefore, these 2 fish species are good to use as index fish species to compare the endemicities of C. sinensis infection in 3 regions of the present study. Until now the susceptible fish host for CsMc, P. parva, has been used as an index species for distribution of C. sinensis at certain areas [10,12,20-22]. However, in this study, their number examined were limited.
By the present study, it is confirmed again that the southern areas are highly endemic for clonorchiasis in Korean peninsula [1-6]. The positive rates and infection densities of CsMc are higher in over all fish examined, as well as in P. herzi, from these southern areas, although they are exceptionally higher in fish species, i.e. P. herzi, P. esocinus, S. gracilis majimae and S. japonicus coreanus, from Gunwi-gun, Gyeongsangbuk-do. In the analysis with the index fish, P. herzi, the positive rates are relatively proportioned with the average metacercarial density per infected fish. Therefore, the highly susceptible fish species, P. herzi, can be the real index fish of clonorchiasis transmission in the natural condition, and the presence of metacercariae in this fish species may suggest the maintaining of C. sinensis life cycle in subjected areas.
On the other hand, in case of Z. platypus, CsMc were not detected in 247 fish from northern areas. Total 17 (7.6%) out of 223 Z. platypus from middle areas were infected with 147 CsMc, and 13 (5.7%) out of 228 fishes from southern areas were infected with 139 CsMc. From the above findings, we could not find any special trend in the endemicity of C. sinensis infection in 3 regions. Therefore, it is confirmed that a less susceptible fish species, like Z. platypus, is unsuitable as an index fish, although they are widely collected in 3 regions as dominant fish species.
CsMc were not found in all fishes from 9 localities in northern areas except 2 species, P. herzi and S. japonicus coreanus, from Hantan-gang in Cheolwon-gun, Gangwon-do. In the study by Kim et al. [12], all the fish from upper regions of Cheongju, Chungcheongbuk-do were negative for CsMc, even though the number of susceptible fishes examined were limited. It is interesting that CsMc were detected only in fishes from Hantan-gang in northern areas. First of all, as an important epidemiologic factor for clonorchiasis, the availability of the snail intermediate host, Parafossarulus manchouricus, should be investigated in the near future in Hantan-gang in Cheolwon-gun, Gangwon-do. There have been few studies on the CsMc infection status of fishes from Gangwon-do, whreas many studies have been performed to investigate the infection status of intestinal flukes, including Metagonimus spp. in fishes from Gangwon-do [23-28]. It is probably due to the reasion that Gangwon-do is endemic for intestinal fluke infections rather than clonorchiasis.
Among the 47 fish species listed as the second intermediate hosts of C. sinensis in Korea, Hypomesus olidus (the pond smelt) and Z. platypus are favoritely eaten raw in Korea. Fortunately, they are relatively unsusceptible for CsMc. In our study, CsMc were not found in 247 Z. platypus from Gangwon-do, and in extensive examinations of pond smelts from several lakes in Korea previously by Cho et al. [29]. Moreover, in the present study, they were not detected in 1,532 fishes from Gangwon-do, and in 42 fish from Daecheong-ho. However, Park et al. [30] detected CsMc in H. olidus and Z. platypus from Soyang-ho and Daecheong-ho. Especially, it was remarkable that total 369 CsMc were detected in 100 H. olidus from Daecheong-ho [30]. Judging by aforementioned data and ecological and biological characteristics of C. sinensis, the findings of Park et al. (2004) need further verification.
The positive rates and densities of CsMc were relatively high in fishes from the upper reaches of Nakdong-gang in Youngyang-gun and Gunwi-gun, Gyeongsangbuk-do. Of the 86 fishes from Youngyang-gun, 31 (36.0%) were infected with av. 126 CsMc, and 70 (51.5%) of 136 fishes from Gunwi-gun were infected with av. 287 CsMc. Chung et al. [31] examined 794 fishes, including 140 P. herzi from Youngyang-gun, and they detected 2.1 CsMc per gram of muscles from only 10 (23.3%) of 43 Gnathopogon atromaculatus (=Squalidus chankaensis tsuchigae) examined. Kim et al. [32] detected 11.6 CsMc per gram of muscles in 61 (43.9%) of 139 fishes from Wicheon in Uiseong-gun, Gyeongsangbuk-do. Accordingly, we could determine that the endemicity of CsMc in fishes from Youngyang-gun and Gunwi-gun are a little higher in the present study than in previous reports.
There have been few studies that examined the infection status of CsMc in fishes from Jeollanam-do. Kim et al. [12] roughly revealed the distribution of fishes infected with CsMc based on individual fish species. The present study showed a more detailed information on the endemicity of CsMc in fishes from 6 localities, Gokseong-gun, Gurye-gun, Naju-si, Gangjin-gun, Jangheung-gun, and Boseong-gun, in Jeollanam-do. The endemicity was relatively higher in fishes from 5 localities except Jangheung-gun. Especially, it is interesting to note that the endemicity of C. sinensis in fishes from Gangjin-gun is high, because Gangjin-gun has been well known as a highly endemic area of metagonimiasis [33,34].
Studies on the CsMc infection status of fishes from Taehwa-gang in Ulsan Metropolical City were performed by some workers. Joo [15,35] examined 504 and 697 freshwater fishes from Taehwa-gang, and reported 31 (6.2%) and 126 (18.1%) fish infected with CsMc. Rim et al. [36] also reported 29 (47.5%) CsMc positive fishes, of 2 species, P. parva and S. chankaensis tsuchigae, out of 61 fishes examined in Taehwa-gang. In the present study, we detected total 180 CsMc in 11 (9.2%) fishes of only 2 species, S. chankaensis tsuchigae, and Z. platypus, out of 119 fishes from Taehwa-gang. Therefore, we could determine that the endemicity of CsMc in the present study is much lower than those in the previous studies.
Bae et al. [37] extensively surveyed on C. sinensis infections in the first and second intermediate hosts, definitive hosts, and inhabitants, residing along Nam-gang, in Gyeongsangnam-do. Especially on the second intermediate hosts, they reported that 83 (34.7%) of 239 fishes, including 64 P. parva, were infected with CsMc. In the present study, we examined total 790 freshwater fishes from Yangcheon-gang, a stream of Nam-gang, in Sancheong-gun, Gyeongsangnam-do, and detected av. 187 CsMc from 381 (48.2%) fishes. Until now the endemicity of CsMc in fishes from streams of Nam-gang, including Yangcheon-gang, is as high as in old days. It seems to be one of the reasons why Sancheong-gun is the most highly endemic area of clonorchiasis around the whole country [5]. Therefore, inhabitants residing in endemic areas, like Sancheong-gun, should pay attention to clonorchiasis, and consumption of raw freshwater fish naturally produced in these areas should be avoided.
This study was supported by an anti-communicable diseases control program (NIH 348-6111-215) and a project on the parasite fauna of the Republic of Korea and management of parasitic diseases cyber-musium (2008-E00165-00) of National Institute of Health, Ministry of Health and Welfare, the Republic of Korea. We thank Young-Kil Kim (Division of Public Health Policy, Province of Gyeongsangbuk-do) and Sook-Nam Hwang (Division of Microbiology, Ulsan Institute of Health and Environment), for their help in collection of freshwater fish, and A-Ra Cho, Hae-In Ryu, Jung-A Kim, and Hee-Joo Kim (Department of Parasitology, Gyeongsang National University School of Medicine, Jinju, Korea), for their help in examination of fishes.
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Fig. 1
The surveyed areas. The northern area located over 37° North Latitude is comprised of 7 administrative regions of Gangwon-do (① Inje-gun: Soyang-gang, ② Hongcheon-gun: Hongcheon-gang, ③ Cheolwon-gun: Hantan-gang and Hwa-gang, ④ Yanggu-gun: Sooip-cheon, ⑤ Yangyang-gun: Namdae-cheon, ⑥ Youngweol-gun: Dong-gang and ⑦ Samcheok-si: Osip-cheon and Gagok-cheon). The middle area located between 36° and 37° North Latitude is contained 3 regions of Chungcheongbuk-do (⑧ Okcheon-gun: Gum-gang, ⑨ Goisan-gun: Cheong-cheon and ⑩ Daecheong-ho), and 7 regions of Nakdong-gang (⑪ Ahndong-si, ⑫ Sangju-si, ⑬ Bonghwa-gun, ⑭ Yecheon-gun, ⑮ Youngyang-gun, ⑯ Youngdeok-gun and ⑰ Gunwi-gun) in Gyeongsangbuk-do. The southern area located below 36° North Latitude is comprised of 6 administrative regions of Jeollanam-do (⑱ Gokseong-gun: Seomjin-gang, ⑲ Gurye-gun: Seomjin-gang, ⑳ Naju-si: Youngsan-gang, ㉑ Gangjin-gun: Tamjin-gang, ㉒ Jangheung-gun: Tamjin-gang and ㉓ Boseong-gun: Boseong-gang), and ㉔ Ulsan Metropolitan City (Taehwa-gang) and ㉕ Sancheong-gun (Yangcheon-gang) in Gyeongsangnam-do.
kjp-49-385-g001.jpg
Table 1.
Fishesa collected from northern regions (Gangwon-do), Korea
Table 1.
Species of fish No. of fish collected from 6 localitesb
① ②-1 ②-2 ③-1 ③-2 ③-3 Total
Cypriniforms
 Zacco platypus 40 10 20 16 30 3 119
 Pungtungia herzi 14 20 25 8 7 13 87
 Zacco temminckii 6 - 16 19 30 10 81
 Hemibarbus longirostris 5 - 20 14 3 12 54
 Pseudogobio esocinus 10 1 23 5 8 3 50
 Coreoleuciscus splendidus 5 3 18 19 - 2 47
 Microphysogobio longidorsalis - - 20 4 - 8 32
 Carassius auratus 6 - 2 2 3 5 18
 Acheilognathus signifer - 10 - - - 4 14
 Hemibarbus labeo 10 - 1 2 - - 13
 Acheilognathus majusculus - - 6 - 6 - 12
 Cyprinus capio 5 - - - - - 5
 Acheilognathus yamatsutae - - - 5 - - 5
 Acheilognathus rhombeus 5 - 5
 Opsariichthys uncirostris 3 - 2 - - - 5
 Pseudopungtungia tenuicorpa 1 3 - - - - 4
 Pseudobagrus fulvidraco - - - 4 - - 4
 Hemibarbus mylodon - - - 1 3 - 4
 Acanthorhodeus gracills - - - 3 - - 3
 Acheilognathus lanceolatus - - - - 1 2 3
 Hemiculter leucisculus 3 - - - - - 3
 Koreocobitis rotundicaudata - - - 3 - - 3
 Orthrias toni - 3 - - - - 3
 Rhynchocypris steidachneri - - - - 3 - 3
 Rhynchocypris oxycephalus - - - 2 - - 2
 Squalidus japonicus coreanus - - - - 2 - 2
 Sarcocheilichthys nigripinnis - - - - 1 - 1
 Microphysogobio jeoi - - - - 1 - 1
 Abbottina springeri 1 - - - - - 1
 Abbotina revulais - 1 - - - - 1
Siluriformes
 Liobagrus andersoni 4 10 - - - - 14
 Leiocassis ussuriensis 3 - - - - - 3
Perciformes
 Coreoperca herzi - 15 20 3 5 7 50
 Siniperca scherzeri 7 - 11 - - - 18
 Odontobutis platycephala - 6 2 - - - 8
Total 123 82 186 110 108 69 678

aTotal 678 freshwater fishes of 36 species were examined.

b① Inje-gun (Soyang-gang); ②-1 Hongcheon-gun (Hongcheon-gang, 2003); ②-2 Hongcheon-gun (Hongcheon-gang, 2010); ③-1 Cheolwon-gun (Hantan-gang, 2005); ③-2 Cheolwon-gun (Hantan-gang, 2010); ③-3 Cheolwon-gun (Hwa-gang, 2010).

Table 2.
Fishesa collected from northern regions (Gangwon-do), Korea (2009)
Table 2.
Species of fish No. of fish collected from 5 localitiesb
④ ⑤ ⑥ ⑦-1 ⑦-2 Total
Cypriniforms
 Zacco platypus 26 30 30 23 19 128
 Zacco temminckii 23 30 30 - 20 103
 Coreoleuciscus splendidus 27 - 30 30 8 95
 Pungtungia herzi 11 15 16 - 17 59
 Tribolodon hakonensis - 30 - 21 - 51
 Microphysogobio longidorsalis 25 - 25 - - 50
 Rhynchocypris oxycephalus 10 3 - 1 25 39
 Hemibarbus longirostris 14 - 16 - - 30
 Pseudogobio esocinus 11 - 10 - - 21
 Gobiobotia brevibarba - - 18 - - 18
 Carassius auratus 14 2 - - - 16
 Hemibarbus labeo - - 13 - - 13
 Koreocobitis rotundicaudata - - 13 - - 13
 Hemibarbus mylodon 2 - 10 - - 12
 Acanthorhodeus macropterus - - 10 - - 10
 Orthrias toni - - - 8 - 8
 Opsariichthys uncirostris 5 - - - - 5
 Misgurnus mizolepis - - 5 - - 5
 Ladislabia taczanowskii - - - 3 - 3
 Gobiobotia macrocephala - - 3 - - 3
 iksookimia koreensis - - 2 - - 2
 Cyprinus capio 1 - - - - 1
 Pseudobagrus fulvidraco - - 1 - - 1
Osmeriformes
 Plecoglossus altivelis - 25 - 29 - 54
Salmoniformes
 Onchorhynchus masou masou - 5 - 2 3 10
Siluriformes
 Liobagrus andersoni 10 - 3 - - 13
 Silurus asotus - - 1 - - 1
Perciformes
 Coreoperca herzi 17 10 15 - - 42
 Chaenogobius urotaenia - - - 19 8 27
 Tridentiger brevispinis - - - 15 9 24
 Rhinogobius giurinus - - - 4 - 4
 Acanthogobius pflaumi - 4 - - - 4
Total 196 154 251 155 109 865

aTotal 865 freshwater fishes of 32 species were examined.

b5 localities, ④ Yanggu-gun (Sooip-cheon); ⑤ Yangyang-gun (Namdae-cheon); ⑥ Youngweol-gun (Dong-gang); ⑦-1 Samcheok-si (Osip-cheon); ⑦-2 Samcheok-si (Gagok-cheon).

Table 3.
Fishesa collected from middle regions (Chungcheongbuk-do), Korea
Table 3.
Species of fish No. of fish collected from 3 localitiesb
⑧ ⑨ ⑩ Total
Cypriniforms
 Zacco platypus 43 20 2 65
 Acheilognathus lanceolatus 49 - 2 51
 Acanthorhodeus gracilis 41 - - 41
 Hemibarbus labeo 34 - 5 39
 Hemiculter eigenmanni 28 - 4 32
 Pungtungia herzi 25 6 - 31
 Carassius auratus 21 - 10 31
 Opsariichthys uncirostris 14 - 10 24
 Squalidus gracilis majimae 20 - - 20
 Culter brevicauda 20 - - 20
 Pseudogobio esocinus 12 5 - 17
 Hemibarbus longirostris - 15 - 15
 Cyprinus carpio 6 - 7 13
 Acheilognathus rhombeus 5 - - 5
 Sarcocheilichthys variegatus 2 3 - 5
 Squalidus japonicus coreanus 4 - - 4
 Acanthorhodeus macropterus 4 - - 4
 Pseudorasbora parva 3 - - 3
 Coreoleuciscus splendidus - 2 - 2
 Sarcocheilichthys nigripinnis 2 - - 2
 Squaliobarbus curriculus 1 - 1 2
 Pseudorasbora parva 1 - - 1
 Pseudopungtungia nigra 1 - - 1
 Rhynchocypris oxycephalus 1 - - 1
 Aphyocypris chinensis 1 - - 1
 Cobitis lutheri - 1 - 1
 Plecoglossus altivelis 1 - - 1
Siluriformes
 Leiocassis ussuriensisa 1 - - 1
Perciformes
 Odontobutis platycephala 12 - - 12
 Siniperca scherzeri 2 - 1 3
 Coreoperca herzi 2 1 - 3
Total 356 53 42 451

aTotal 451 freshwater fishes of 32 species were examined.

b3 localities, ⑧ Okcheon-gun (Gum-gang); ⑨ Goisan-gun (Cheong-cheon); ⑩ Daecheong-ho (Lake).

Table 4.
Fishesa collected from middle regions (Gyeongsangbuk-do), Korea
Table 4.
Species of fish No. of fish collected from 7 localitiesb
⑪ ⑫ ⑬ ⑭ ⑮ ⑯ ⑰ Total
Cypriniforms
 Zacco platypus 21 - 11 26 24 39 37 158
 Pungtungia herzi 24 6 11 2 15 14 4 76
 Zacco temminckii 25 - 7 - 8 2 9 51
 Squalidus gracilis majimae 5 - - - - 28 9 42
 Coreoleuciscus splendidus 13 - 17 - 8 - - 38
 Carassius auratus 1 3 - 14 - 1 14 33
 Squalidus japonicus coreanus - - - - - - 29 29
 Niwaella multifasciata 3 - 10 - 15 - - 28
 Pseudogobio esocinus - 3 - 12 - - 1 16
 Hemibarbus longirostris - - - 10 - - 4 14
 Acanthorhodeus gracilis - 2 - 10 - - 2 14
 Acheilognathus signifer 4 - - - 2 - 6 12
 Cyprinus capio - 2 - 10 - - - 12
 Misgurnus anguillicaudatus 8 2 - - 1 - - 11
 Hemibarbus labeo - 6 - 3 - - 1 10
 Opsariichthys uncirostris - - - 4 - - 6 10
 Acheilognathus yamatsutae - - - - - - 9 9
 Pseudobagrus fulvidraco - - - 9 - - - 9
 Koreocobitis naktongensis - - 8 - - - - 8
 Tribolodon hakonensis - - - - - 6 - 6
 Pseudobagrus koreanus - 3 - 2 - - - 5
 Microphysogobio koreensis - - 1 - 2 - - 3
 iksookimia yongdokensis - - - - - 3 - 3
 Culter brevicauda - - - 2 - - - 2
 Squalidus chankaensis tsuchigae - - - - 1 - - 1
 Ladislabia taczanowskii - - - 2 - - - 2
 Pseudorasbora parva - - - - - - 1 1
 Cobitis sinensis - - - - - - 1 1
Osmeriformes
 Plecoglossus altivelis - - - - - 10 - 10
Siluriformes
 Liobagrus andersoni - - 15 - - - - 15
 Liobagrus obesus - - 10 - 1 - - 11
 Silurus microdorsalis 1 - - 8 - - - 9
Perciformes
 Coreoperca herzi 6 10 6 11 6 - 3 42
 Siniperca scherzer - 1 - 1 - - - 2
 Odontobutis platycephala 7 7 1 5 3 - - 23
Total 118 45 97 131 86 103 136 716

aTotal 716 freshwater fishes in 35 species were examined.

b⑪ Ahndong-si; ⑫ Sangju-si; ⑬ Bonghwa-gun; ⑭ Yecheon-gun; ⑮ Youngyang-gun; ⑯ Youngdeok-gun; ⑰ Gunwi-gun.

Table 5.
Fishesa collected from southern regions (Jeollanam-do), Korea
Table 5.
Species of fish No. of fish collected from 6 localitiesb
⑱ ⑲ ⑳ ㉑ ㉒ ㉓ Total
Cypriniforms
 Zacco platypus 42 1 20 10 10 1 84
 Carassius auratus 13 7 10 - 2 2 34
 Squalidus chankaensis tsuchigae 4 25 - - - - 29
 Acheilognathus yamatsutae 12 7 3 2 - 3 27
 Pungtungia herzi 12 1 - 6 3 2 24
 Pseudogobio esocinus 8 3 3 3 3 2 22
 Liobagrus mediadiposalis 21 - - - - - 21
 Acheilognathus lanceolatus - 1 8 - 10 - 19
 Zacco temminckii 8 - - 1 10 - 19
 Sarcocheilichthys variegatus 4 - - 15 - - 19
 Coreoleuciscus splendidus 17 1 - - - - 18
 Acanthorhodeus macropterus - - - 8 10 - 18
 Hemibarbus longirostris 2 6 4 3 - - 15
 Squalidus japonicus coreanus 12 - 1 - - - 13
 Hemibarbus labeo 3 - 8 - - - 11
 Sarcocheilichthys nigripinis - 10 - - - - 10
 Opsariichthys uncirostris 3 - 2 - - 1 6
 Hemiculter eigenmanni 5 - - - - - 5
 Acheilognathus majusculus 4 - - - - - 4
 Abbottina springeri 3 - - - - - 3
 Gnathopogon strigatus - - - 3 - - 3
 Rhodeus ocellatus - - - - 3 - 3
 Cobitis lutheri - - - - - 3 3
 Ladislabia taczanowskii 2 - - - - - 2
 Microphysogobio koreensis - 2 - - - - 2
 Pseudorasbora parva - - - 1 - - 1
 Cyprinus capio 1 - - - - - 1
 Misgurnus anguillicaudatus - - - - - 1 1
 Microphysogobio longidorsalis - 1 - - - - 1
Osmeriformes
 Plecoglossus altivelis - 2 - 6 - - 8
Siluriformes
 Liobagrus mediadiposalis - - - - - 1 1
Perciformes
 Coreoperca herzi 7 - - - - - 7
 Siniperca scherzeri 5 1 - - - - 6
 Micropterus salmoides - - 5 - - - 5
 Odontobutis platycephala 3 - 1 - 1 2 7
Total 191 68 65 58 52 18 452

aTotal 452 freshwater fishes of 35 species were examined;

b⑱ Gokseong-gun (Seomjin-gang); ⑲ Gurye-gun (Seomjin-gang); ⑳ Naju-si (Youngsan-gang); ㉑Gangjin-gun (Tamjin-gang); ㉒ Jangheung-gun (Tamjin-gang);㉓Boseong-gun (Boseong-gang).

Table 6.
Fishesa collected from southern regions (Ulsan Metropolitan City and Gyeongsangnam-do), Korea
Table 6.
Species of fish No. of fish collected from 3 localitiesb
㉔ ㉕-1 ㉕-2 ㉕-3 Total
Cypriniforms
 Pungtungia herzi - 24 44 78 146
 Zacco platypus 60 21 19 44 144
 Pseudogobio esocinus - 34 16 60 110
 Zacco temminckii 4 34 20 32 90
 Carassius auratus 5 36 13 18 72
 Hemibarbus longirostris - 31 15 22 68
 Acheilognathus majuscules - 25 13 10 48
 Squalidus chankaensis tsuchigae 25 7 2 3 37
 Acanthorhodeus macropterus - 15 - 15 30
 Squalidus gracilis coreanus - - 2 9 11
 Pseudorasbora parva 5 - - 1 6
 Acheilognathus signifer - - 6 - 6
 Hemibarbus labeo 5 - - - 5
 Acheilognathus rhombeus - 3 - 2 5
 Acheilognathus koreensis - - 4 - 4
 Culter brevicauda - - 4 - 4
 Sarcocheilichthys variegates - - 2 2 4
 Hemiculter eigenmanni 2 - 2 - 4
 Opsariichthys uncirostris 3 - - - 3
 Pseudobagrus koreanus - 2 - - 2
 Sarcocheilichthys nigripinnis - - 1 - 1
Perciformes
 Coreoperca herzi 2 19 8 30 59
 Siniperca scherzeri - 2 - - 2
 Odontobutis platycephala 8 8 8 24 48
Total 119 261 179 350 909

aTotal 909 freshwater fishes of 24 species were examined;

b㉔ Ulsan Metropolitan City (Taehwa-gang); ㉕-1 Sancheong-gun (Yangcheon-gang, 2006); ㉕-2 Sancheong-gun (Yangcheon-gang, 2007); ㉕-3 Sancheong-gun (Yangcheon-gang, 2010).

Table 7.
Prevalence and density of C. sinensis metacercariae in fishes from Chungcheongbuk-do, a middle region of Korea
Table 7.
Location and fish sp. No. of fish examined No. (%) of fish infected No. of metacercariae detected
Total Range Average
⑧ Gum-gang (River)
 Sarcocheilichthys nigripinnis 2 1 (50.0) 20 - 20.0
 Pungtungia herzi 25 1 (4.0) 2 - 2.0
 Squalidus gracilis majimae 20 8 (40.0) 15 1-4 1.9
 Acanthorhodeus gracilis 41 4 (9.8) 5 1-2 1.3
 Acheilognathus ianceolatus 49 3 (6.1) 3 - 1.0
 Hemibarbus labeo 34 1 (2.9) 1 - 1.0
 Hemiculter eigenmanni 28 1 (3.6) 1 - 1.0
 Sarcocheilichthys varbgatus 2 1 (50.0) 1 - 1.0
 Pseudopungtungia nigra 1 1 (100) 1 - 1.0
 Rhynchocypris oxycephalus 1 1 (100) 1 - 1.0
 Subtotal 203 22 (10.8) 50 1-20 2.3
⑨ Cheong-cheon (Stream) in Goisan-gun
 Pungtungia herzi 6 4 (66.7) 23 2-12 5.8
 Zacco platypus 20 1 (5.0) 3 - 3.0
 Sarcocheilichthys varbgatus 3 1 (33.3) 1 - 1.0
 Subtotal 29 6 (20.7) 27 1-12 4.5
Total 232 28 (12.1) 77 1-20 2.8
Table 8.
Prevalence and density of C. sinensis metacercariae in fishes from Nakdong-gang, Gyeongsangbuk-do, a middle region of Korea
Table 8.
Location and fish sp. No. of fish examined No. (%) of fish infected No. of metacercariae detected
Total Range Average
⑭ Yecheon-gun
 Ladislabia taczanowskii 2 2 (100) 33 5-28 16.5
 Culter brevicauda 2 2 (100) 19 2-17 9.5
 Pungtungia herzi 2 1 (50.0) 8 - 8.0
 Zacco platypus 26 1 (3.8) 4 - 4.0
 Pseudogobio esocinus 12 1 (8.3) 1 - 1.0
 Hemibarbus longirostris 10 1 (10.0) 2 - 2.0
 Hemibarbus labeo 3 1 (33.3) 1 - 1.0
 Subtotal 57 9 (15.8) 68 1-28 7.6
⑮ Youngyang-gun
 Pungtungia herzi 15 15 (100) 3,736 13-630 249.1
 Squalidus chankaensis tsuchigae 1 1 (100) 56 - 56.0
 Microphysogobio koeensis 2 2 (100) 54 1-53 27.0
 Coreoleuciscus splendidus 8 7 (87.5) 45 1-16 6.4
 Acheilognathus signifer 2 1 (50.0) 4 - 4.0
 Zacco platypus 24 5 (20.8) 13 1-6 2.6
 Subtotal 52 31 (59.6) 3,908 1-630 126.1
⑰ Gunwi-gun
 Pseudogobio esocinus 1 1 (100) 2,105 - 2,105
 Squalidus gracills majimae 9 9 (100) 7,463 385-1,875 829.2
 Pungtungia herzi 4 4 (100) 3,279 329-1,180 819.8
 Squalidus japonicus coreanus 29 29 (100) 6,872 9-875 237.0
 Acanthorhodeus gracilis 2 2 (100) 136 54-82 68.0
 Zacco platypus 37 9 (24.3) 126 1-77 14.0
 Pseudorasbora parva 1 1 (100) 11 - 11.0
 Hemibarbus longirostris 4 4 (100) 34 3-13 8.5
 Acheilognathus signifer 6 6 (100) 43 2-11 7.2
 Zacco temminckii 9 1 (11.1) 3 - 3.0
 Acheilognathus yamatsutae 9 1 (11.1) 2 - 2.0
 Opsariichthys uncirostris 6 1 (16.7) 1 - 1.0
 Coreoperca herzi 3 1 (33.3) 1 - 1.0
 Hemibarbus labeo 1 1 (100) 1 - 1.0
 Subtotal 111 70 (63.1) 20,077 1-2,105 286.8
Total 220 110 (50.0) 24,053 1-2,105 218.7
Table 9.
Prevalence and density of C. sinensis metacercariae in fishes from Seomjin-gang (River), Jeollanam-do, a southern region of Korea
Table 9.
Location and fish sp. No. of fish examined No. (%) of fish infected No. of metacercariae detected
Total Range Average
⑱ Gokseong-gun
 Ladislabia taczanowskii 2 2 (100) 604 259-345 302.0
 Sarcocheilichthys varbgatus 4 2 (50.0) 379 20-359 189.5
 Zacco platypus 42 1 (2.4) 118 - 118.0
 Pungtungia herzi 12 10 (83.3) 1,139 1-275 113.9
 Squalidus japonicus coreanus 12 3 (25.0) 164 20-93 54.7
 Abbottina springeri 3 2 (66.7) 27 2-25 13.5
 Squalidus chankaensis 4 3 (75.0) 31 4-16 10.3
 Hemibarbus longirostris 2 2 (100) 7 2-5 3.5
 Cyprinus capio 1 1 (100) 2 - 2.0
 Acheilognathus majusculus 4 2 (50.0) 4 - 2.0
 Coreoleuciscus splendidus 17 11 (64.7) 18 1-3 1.6
 Carassius auratus 13 1 (7.7) 1 - 1.0
 Hemibarbus labeo 3 2 (66.7) 2 - 1.0
 Subtotal 119 42 (35.3) 2,496 1-359 59.4
⑲ Gurye-gun
 Pungtungia herzi 1 1 (100) 377 - 377.0
 Squalidus chankaensis tsuchigae 25 19 (76.0) 771 1-351 40.6
 Sarcocheilichthys nigripinis 10 10 (100) 217 6-62 21.7
 Microphysogobio koreensis 2 1 (50.0) 14 - 14.0
 Siniperca scherzeri 1 1 (100) 4 - 4.0
 Hemibarbus longirostris 6 1 (16.7) 3 - 3.0
 Pseudogobio esocinus 3 2 (66.7) 2 - 1.0
 Acheilognathus yamatsutae 7 1 (14.3) 1 - 1.0
 Microphysogobio longidorsalis 1 1 (100) 1 - 1.0
 Subtotal 56 37 (66.1) 1,390 1-377 37.6
Total 175 79 (45.1) 3,886 1-377 49.2
Table 10.
Prevalence and density of C. sinensis metacercariae in fishes from rivers in Jeollanam-do, southern regions of Korea
Table 10.
Location and fish sp. No. of fish examined No. (%) of fish infected No. of metacercariae detected
Total Range Average
⑳ Youngsan-gang in Naju-si
 Squalidus japonicus coreanus 1 1 (100) 815 - 815.0
 Acheilognathus lanceolatus 5 5 (100) 730 2-460 146.0
 Hemibarbus longirostris 4 4 (100) 215 23-107 53.8
 Opsarichthys uncirostris 2 1 (50.0) 28 - 28.0
 Pseudogobio esocinus 3 3 (100) 24 1-12 8.0
 Acheilognathus yamatsutae 3 2 (66.7) 10 1-9 5.0
 Zacco platypus 20 1 (5.0) 2 - 2.0
 Hemibarbus labeo 8 5 (62.5) 6 1-2 1.2
 Carassius auratus 10 1 (10.0) 1 - 1.0
 Subtotal 56 23 (41.1) 1,831 1-460 79.6
㉑ Tamjin-gang in Gangjin-gun
 Pungtungia herzi 6 6 (100) 2,520 95-846 420.0
 Sarcocheilichthys varbgatus 15 15 (100) 5,342 65-682 356.1
 Gnathopogon strigatus 3 3 (100) 122 30-52 40.7
 Pseudorasbora parva 1 1 (100) 6 - 6.0
 Acanthorhodeus macropterus 8 5 (62.5) 14 1-9 2.8
 Pseudogobio esocinus 3 3 (100) 6 1-3 2.0
 Acheilognathus yamatsutae 2 2 (100) 4 1-3 2.0
 Hemibarbus longirostris 3 3 (100) 5 1-3 1.7
 Zacco platypus 10 1 (10.0) 1 - 1.0
 Subtotal 51 39 (76.5) 8,020 1-846 205.6
㉓ Boseong-gang in Boseong-gun
 Pungtungia herzi 2 2 (100) 157 9-148 78.5
 Pseudogobio esocinus 2 1 (50.0) 2 - 2.0
 Acheilognathus yamatsutae 3 1 (33.3) 2 - 2.0
 Zacco platypus 1 1 (100) 1 - 1.0
 Subtotal 8 5 (62.5) 162 1-148 32.4
Total 115 67 (58.3) 10,013 1-846 149.4
Table 11
Prevalence and density of C. sinensis metacercariae in fishes from Yangcheon-gang (River), Sancheong-gun, Gyeongsangnam-do, a southern region of Korea
Table 11
Year examined and fish sp. No. of fish examined No. (%) of fish infected No. of metacercariae detected
Total Range Average
2006
 Pungtungia herzi 24 24 (100) 19,044 324-1,408 793.5
 Squalidus chankaensis tsuchigae 7 7 (100) 1,775 100-380 253.6
 Pseudogobio esocinus 34 34 (100) 3,643 2-313 107.2
 Acheilognathus rhombeus 3 3 (100) 187 37-112 62.3
 Acanthorhodeus macropterus 15 10 (66.7) 335 1-83 33.5
 Acheilognathus majuscules 25 18 (72.0) 100 1-44 5.6
 Hemibarbus longirostris 31 7 (22.6) 13 1-3 1.9
 Zacco temminckii 34 4 (11.8) 6 1-3 1.5
 Zacco platypus 21 3 (14.3) 3 - 1.0
 Subtotal 194 110 (56.7) 25,106 1-1,408 228.2
2007
 Pungtungia herzi 44 44 (100) 28,294 106-2,345 707.4
 Squalidus chankaensis tsuchigae 2 2 (100) 658 178-480 329.0
 Sarcocheilichthys varbgatus 2 2 (100) 551 145-406 275.5
 Squalidus gracilis coreanus 2 2 (100) 298 89-209 149.0
 Pseudogobio esocinus 16 13 (81.3) 817 1-197 62.9
 Sarcocheilichthys nigripinnis 1 1 (100) 11 - 11.0
 Hemiculter eigenmmni 2 2 (100) 14 - 7.0
 Acheilognathus signifer 6 6 (100) 35 1-16 5.8
 Coreoperca herzi 8 1 (12.5) 4 - 4.0
 Hemibarbus longirostris 15 8 (53.3) 23 1-10 2.9
 Zacco platypus 19 1 (5.3) 2 - 2.0
 Acheilognathus koreensis 4 2 (50.0) 4 1-3 2.0
 Acheilognathus majusculus 13 9 (69.2) 16 1-4 1.8
 Carassius auratus 13 1 (7.7) 1 - 1.0
 Odontobutis platycephala 8 1 (12.5) 1 - 1.0
 Subtotal 155 95 (61.3) 30,729 1-2,345 323.4
2010
 Sarcocheilichthys varbgatus 2 2 (100) 542 240-302 271.0
 Pungtungia herzi 78 71 (91.0) 13,143 1-1,286 185.1
 Squalidus chankaensis tsuchigae 3 3 (100) 235 48-131 78.3
 Pseudorasbora parva 1 1 (100) 45 - 45.0
 Acheilognathus rhombeus 2 2 (100) 51 15-36 25.5
 Squalidus gracilis coreanus 9 8 (88.9) 191 2-59 23.9
 Acheilognathus macropterus 15 11 (73.3) 263 4-98 23.9
 Pseudogobio esocinus 60 55 (91.7) 994 1-136 18.1
 Zacco platypus 44 5 (11.4) 12 1-8 2.4
 Hemibarbus longirostris 22 17 (77.3) 37 1-6 2.2
 Acheilognathus majusculus 10 1 (10.0) 1 - 1.0
 Subtotal 246 176 (71.5) 15,514 1-1,286 88.1
Total 595 381 (64.0) 71,349 1-2,345 187.3
Table 12.
Comparative prevalencea and densitya of C. sinensis metacercariae in fishes from 3 latitudinal regions
Table 12.
Items Infection status (%) in fishes from
Northern Middle Southern Total
No. (%) of fish examined 1,543 (37.9) 1,167 (28.7) 1,361 (33.4) 4,071 (100)
Total positive rate (%) 11/1,543 (0.7) 149/1,167 (12.8) 538/1,361 (39.5) 698/4,071 (17.1)
Overall metacercarial density/fish 2.6 163.7 158.8 157.4
Positive rate (%) of P. herzi 9/146 (6.2) 34/107 (31.8) 158/170 (92.9) 201/423 (47.5)
Metacercarial density in P. herzi 2.8 214.7 409.3 358.2
Positive rate (%) of Z. platypus 0/247 (0) 17/223 (7.6) 13/228 (5.7) 30/698 (4.3)
Metacercarial density in Z. platypus 0 8.6 10.7 9.5

aPrevalence: no. of fish infected/no. of fish examined×100; density: mean no. of metacercariae per infected fish.

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Prevalence of Clonorchis sinensis Metacercariae in Freshwater Fish from Three Latitudinal Regions of the Korean Peninsula
Korean J Parasitol. 2011;49(4):385-398.   Published online December 16, 2011
DOI: https://doi.org/10.3347/kjp.2011.49.4.385
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Prevalence of Clonorchis sinensis Metacercariae in Freshwater Fish from Three Latitudinal Regions of the Korean Peninsula
Korean J Parasitol. 2011;49(4):385-398.   Published online December 16, 2011
DOI: https://doi.org/10.3347/kjp.2011.49.4.385
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Prevalence of Clonorchis sinensis Metacercariae in Freshwater Fish from Three Latitudinal Regions of the Korean Peninsula
Image
Fig. 1 The surveyed areas. The northern area located over 37° North Latitude is comprised of 7 administrative regions of Gangwon-do (① Inje-gun: Soyang-gang, ② Hongcheon-gun: Hongcheon-gang, ③ Cheolwon-gun: Hantan-gang and Hwa-gang, ④ Yanggu-gun: Sooip-cheon, ⑤ Yangyang-gun: Namdae-cheon, ⑥ Youngweol-gun: Dong-gang and ⑦ Samcheok-si: Osip-cheon and Gagok-cheon). The middle area located between 36° and 37° North Latitude is contained 3 regions of Chungcheongbuk-do (⑧ Okcheon-gun: Gum-gang, ⑨ Goisan-gun: Cheong-cheon and ⑩ Daecheong-ho), and 7 regions of Nakdong-gang (⑪ Ahndong-si, ⑫ Sangju-si, ⑬ Bonghwa-gun, ⑭ Yecheon-gun, ⑮ Youngyang-gun, ⑯ Youngdeok-gun and ⑰ Gunwi-gun) in Gyeongsangbuk-do. The southern area located below 36° North Latitude is comprised of 6 administrative regions of Jeollanam-do (⑱ Gokseong-gun: Seomjin-gang, ⑲ Gurye-gun: Seomjin-gang, ⑳ Naju-si: Youngsan-gang, ㉑ Gangjin-gun: Tamjin-gang, ㉒ Jangheung-gun: Tamjin-gang and ㉓ Boseong-gun: Boseong-gang), and ㉔ Ulsan Metropolitan City (Taehwa-gang) and ㉕ Sancheong-gun (Yangcheon-gang) in Gyeongsangnam-do.

Fig. 1

Prevalence of Clonorchis sinensis Metacercariae in Freshwater Fish from Three Latitudinal Regions of the Korean Peninsula
Species of fish No. of fish collected from 6 localitesb
① ②-1 ②-2 ③-1 ③-2 ③-3 Total Cypriniforms  Zacco platypus 40 10 20 16 30 3 119  Pungtungia herzi 14 20 25 8 7 13 87  Zacco temminckii 6 - 16 19 30 10 81  Hemibarbus longirostris 5 - 20 14 3 12 54  Pseudogobio esocinus 10 1 23 5 8 3 50  Coreoleuciscus splendidus 5 3 18 19 - 2 47  Microphysogobio longidorsalis - - 20 4 - 8 32  Carassius auratus 6 - 2 2 3 5 18  Acheilognathus signifer - 10 - - - 4 14  Hemibarbus labeo 10 - 1 2 - - 13  Acheilognathus majusculus - - 6 - 6 - 12  Cyprinus capio 5 - - - - - 5  Acheilognathus yamatsutae - - - 5 - - 5  Acheilognathus rhombeus 5 - 5  Opsariichthys uncirostris 3 - 2 - - - 5  Pseudopungtungia tenuicorpa 1 3 - - - - 4  Pseudobagrus fulvidraco - - - 4 - - 4  Hemibarbus mylodon - - - 1 3 - 4  Acanthorhodeus gracills - - - 3 - - 3  Acheilognathus lanceolatus - - - - 1 2 3  Hemiculter leucisculus 3 - - - - - 3  Koreocobitis rotundicaudata - - - 3 - - 3  Orthrias toni - 3 - - - - 3  Rhynchocypris steidachneri - - - - 3 - 3  Rhynchocypris oxycephalus - - - 2 - - 2  Squalidus japonicus coreanus - - - - 2 - 2  Sarcocheilichthys nigripinnis - - - - 1 - 1  Microphysogobio jeoi - - - - 1 - 1  Abbottina springeri 1 - - - - - 1  Abbotina revulais - 1 - - - - 1 Siluriformes  Liobagrus andersoni 4 10 - - - - 14  Leiocassis ussuriensis 3 - - - - - 3 Perciformes  Coreoperca herzi - 15 20 3 5 7 50  Siniperca scherzeri 7 - 11 - - - 18  Odontobutis platycephala - 6 2 - - - 8 Total 123 82 186 110 108 69 678 Species of fish No. of fish collected from 5 localitiesb
④ ⑤ ⑥ ⑦-1 ⑦-2 Total Cypriniforms  Zacco platypus 26 30 30 23 19 128  Zacco temminckii 23 30 30 - 20 103  Coreoleuciscus splendidus 27 - 30 30 8 95  Pungtungia herzi 11 15 16 - 17 59  Tribolodon hakonensis - 30 - 21 - 51  Microphysogobio longidorsalis 25 - 25 - - 50  Rhynchocypris oxycephalus 10 3 - 1 25 39  Hemibarbus longirostris 14 - 16 - - 30  Pseudogobio esocinus 11 - 10 - - 21  Gobiobotia brevibarba - - 18 - - 18  Carassius auratus 14 2 - - - 16  Hemibarbus labeo - - 13 - - 13  Koreocobitis rotundicaudata - - 13 - - 13  Hemibarbus mylodon 2 - 10 - - 12  Acanthorhodeus macropterus - - 10 - - 10  Orthrias toni - - - 8 - 8  Opsariichthys uncirostris 5 - - - - 5  Misgurnus mizolepis - - 5 - - 5  Ladislabia taczanowskii - - - 3 - 3  Gobiobotia macrocephala - - 3 - - 3  iksookimia koreensis - - 2 - - 2  Cyprinus capio 1 - - - - 1  Pseudobagrus fulvidraco - - 1 - - 1 Osmeriformes  Plecoglossus altivelis - 25 - 29 - 54 Salmoniformes  Onchorhynchus masou masou - 5 - 2 3 10 Siluriformes  Liobagrus andersoni 10 - 3 - - 13  Silurus asotus - - 1 - - 1 Perciformes  Coreoperca herzi 17 10 15 - - 42  Chaenogobius urotaenia - - - 19 8 27  Tridentiger brevispinis - - - 15 9 24  Rhinogobius giurinus - - - 4 - 4  Acanthogobius pflaumi - 4 - - - 4 Total 196 154 251 155 109 865 Species of fish No. of fish collected from 3 localitiesb
⑧ ⑨ ⑩ Total Cypriniforms  Zacco platypus 43 20 2 65  Acheilognathus lanceolatus 49 - 2 51  Acanthorhodeus gracilis 41 - - 41  Hemibarbus labeo 34 - 5 39  Hemiculter eigenmanni 28 - 4 32  Pungtungia herzi 25 6 - 31  Carassius auratus 21 - 10 31  Opsariichthys uncirostris 14 - 10 24  Squalidus gracilis majimae 20 - - 20  Culter brevicauda 20 - - 20  Pseudogobio esocinus 12 5 - 17  Hemibarbus longirostris - 15 - 15  Cyprinus carpio 6 - 7 13  Acheilognathus rhombeus 5 - - 5  Sarcocheilichthys variegatus 2 3 - 5  Squalidus japonicus coreanus 4 - - 4  Acanthorhodeus macropterus 4 - - 4  Pseudorasbora parva 3 - - 3  Coreoleuciscus splendidus - 2 - 2  Sarcocheilichthys nigripinnis 2 - - 2  Squaliobarbus curriculus 1 - 1 2  Pseudorasbora parva 1 - - 1  Pseudopungtungia nigra 1 - - 1  Rhynchocypris oxycephalus 1 - - 1  Aphyocypris chinensis 1 - - 1  Cobitis lutheri - 1 - 1  Plecoglossus altivelis 1 - - 1 Siluriformes  Leiocassis ussuriensisa 1 - - 1 Perciformes  Odontobutis platycephala 12 - - 12  Siniperca scherzeri 2 - 1 3  Coreoperca herzi 2 1 - 3 Total 356 53 42 451 Species of fish No. of fish collected from 7 localitiesb
⑪ ⑫ ⑬ ⑭ ⑮ ⑯ ⑰ Total Cypriniforms  Zacco platypus 21 - 11 26 24 39 37 158  Pungtungia herzi 24 6 11 2 15 14 4 76  Zacco temminckii 25 - 7 - 8 2 9 51  Squalidus gracilis majimae 5 - - - - 28 9 42  Coreoleuciscus splendidus 13 - 17 - 8 - - 38  Carassius auratus 1 3 - 14 - 1 14 33  Squalidus japonicus coreanus - - - - - - 29 29  Niwaella multifasciata 3 - 10 - 15 - - 28  Pseudogobio esocinus - 3 - 12 - - 1 16  Hemibarbus longirostris - - - 10 - - 4 14  Acanthorhodeus gracilis - 2 - 10 - - 2 14  Acheilognathus signifer 4 - - - 2 - 6 12  Cyprinus capio - 2 - 10 - - - 12  Misgurnus anguillicaudatus 8 2 - - 1 - - 11  Hemibarbus labeo - 6 - 3 - - 1 10  Opsariichthys uncirostris - - - 4 - - 6 10  Acheilognathus yamatsutae - - - - - - 9 9  Pseudobagrus fulvidraco - - - 9 - - - 9  Koreocobitis naktongensis - - 8 - - - - 8  Tribolodon hakonensis - - - - - 6 - 6  Pseudobagrus koreanus - 3 - 2 - - - 5  Microphysogobio koreensis - - 1 - 2 - - 3  iksookimia yongdokensis - - - - - 3 - 3  Culter brevicauda - - - 2 - - - 2  Squalidus chankaensis tsuchigae - - - - 1 - - 1  Ladislabia taczanowskii - - - 2 - - - 2  Pseudorasbora parva - - - - - - 1 1  Cobitis sinensis - - - - - - 1 1 Osmeriformes  Plecoglossus altivelis - - - - - 10 - 10 Siluriformes  Liobagrus andersoni - - 15 - - - - 15  Liobagrus obesus - - 10 - 1 - - 11  Silurus microdorsalis 1 - - 8 - - - 9 Perciformes  Coreoperca herzi 6 10 6 11 6 - 3 42  Siniperca scherzer - 1 - 1 - - - 2  Odontobutis platycephala 7 7 1 5 3 - - 23 Total 118 45 97 131 86 103 136 716 Species of fish No. of fish collected from 6 localitiesb
⑱ ⑲ ⑳ ㉑ ㉒ ㉓ Total Cypriniforms  Zacco platypus 42 1 20 10 10 1 84  Carassius auratus 13 7 10 - 2 2 34  Squalidus chankaensis tsuchigae 4 25 - - - - 29  Acheilognathus yamatsutae 12 7 3 2 - 3 27  Pungtungia herzi 12 1 - 6 3 2 24  Pseudogobio esocinus 8 3 3 3 3 2 22  Liobagrus mediadiposalis 21 - - - - - 21  Acheilognathus lanceolatus - 1 8 - 10 - 19  Zacco temminckii 8 - - 1 10 - 19  Sarcocheilichthys variegatus 4 - - 15 - - 19  Coreoleuciscus splendidus 17 1 - - - - 18  Acanthorhodeus macropterus - - - 8 10 - 18  Hemibarbus longirostris 2 6 4 3 - - 15  Squalidus japonicus coreanus 12 - 1 - - - 13  Hemibarbus labeo 3 - 8 - - - 11  Sarcocheilichthys nigripinis - 10 - - - - 10  Opsariichthys uncirostris 3 - 2 - - 1 6  Hemiculter eigenmanni 5 - - - - - 5  Acheilognathus majusculus 4 - - - - - 4  Abbottina springeri 3 - - - - - 3  Gnathopogon strigatus - - - 3 - - 3  Rhodeus ocellatus - - - - 3 - 3  Cobitis lutheri - - - - - 3 3  Ladislabia taczanowskii 2 - - - - - 2  Microphysogobio koreensis - 2 - - - - 2  Pseudorasbora parva - - - 1 - - 1  Cyprinus capio 1 - - - - - 1  Misgurnus anguillicaudatus - - - - - 1 1  Microphysogobio longidorsalis - 1 - - - - 1 Osmeriformes  Plecoglossus altivelis - 2 - 6 - - 8 Siluriformes  Liobagrus mediadiposalis - - - - - 1 1 Perciformes  Coreoperca herzi 7 - - - - - 7  Siniperca scherzeri 5 1 - - - - 6  Micropterus salmoides - - 5 - - - 5  Odontobutis platycephala 3 - 1 - 1 2 7 Total 191 68 65 58 52 18 452 Species of fish No. of fish collected from 3 localitiesb
㉔ ㉕-1 ㉕-2 ㉕-3 Total Cypriniforms  Pungtungia herzi - 24 44 78 146  Zacco platypus 60 21 19 44 144  Pseudogobio esocinus - 34 16 60 110  Zacco temminckii 4 34 20 32 90  Carassius auratus 5 36 13 18 72  Hemibarbus longirostris - 31 15 22 68  Acheilognathus majuscules - 25 13 10 48  Squalidus chankaensis tsuchigae 25 7 2 3 37  Acanthorhodeus macropterus - 15 - 15 30  Squalidus gracilis coreanus - - 2 9 11  Pseudorasbora parva 5 - - 1 6  Acheilognathus signifer - - 6 - 6  Hemibarbus labeo 5 - - - 5  Acheilognathus rhombeus - 3 - 2 5  Acheilognathus koreensis - - 4 - 4  Culter brevicauda - - 4 - 4  Sarcocheilichthys variegates - - 2 2 4  Hemiculter eigenmanni 2 - 2 - 4  Opsariichthys uncirostris 3 - - - 3  Pseudobagrus koreanus - 2 - - 2  Sarcocheilichthys nigripinnis - - 1 - 1 Perciformes  Coreoperca herzi 2 19 8 30 59  Siniperca scherzeri - 2 - - 2  Odontobutis platycephala 8 8 8 24 48 Total 119 261 179 350 909 Location and fish sp. No. of fish examined No. (%) of fish infected No. of metacercariae detected
Total Range Average ⑧ Gum-gang (River)  Sarcocheilichthys nigripinnis 2 1 (50.0) 20 - 20.0  Pungtungia herzi 25 1 (4.0) 2 - 2.0  Squalidus gracilis majimae 20 8 (40.0) 15 1-4 1.9  Acanthorhodeus gracilis 41 4 (9.8) 5 1-2 1.3  Acheilognathus ianceolatus 49 3 (6.1) 3 - 1.0  Hemibarbus labeo 34 1 (2.9) 1 - 1.0  Hemiculter eigenmanni 28 1 (3.6) 1 - 1.0  Sarcocheilichthys varbgatus 2 1 (50.0) 1 - 1.0  Pseudopungtungia nigra 1 1 (100) 1 - 1.0  Rhynchocypris oxycephalus 1 1 (100) 1 - 1.0  Subtotal 203 22 (10.8) 50 1-20 2.3 ⑨ Cheong-cheon (Stream) in Goisan-gun  Pungtungia herzi 6 4 (66.7) 23 2-12 5.8  Zacco platypus 20 1 (5.0) 3 - 3.0  Sarcocheilichthys varbgatus 3 1 (33.3) 1 - 1.0  Subtotal 29 6 (20.7) 27 1-12 4.5 Total 232 28 (12.1) 77 1-20 2.8 Location and fish sp. No. of fish examined No. (%) of fish infected No. of metacercariae detected
Total Range Average ⑭ Yecheon-gun  Ladislabia taczanowskii 2 2 (100) 33 5-28 16.5  Culter brevicauda 2 2 (100) 19 2-17 9.5  Pungtungia herzi 2 1 (50.0) 8 - 8.0  Zacco platypus 26 1 (3.8) 4 - 4.0  Pseudogobio esocinus 12 1 (8.3) 1 - 1.0  Hemibarbus longirostris 10 1 (10.0) 2 - 2.0  Hemibarbus labeo 3 1 (33.3) 1 - 1.0  Subtotal 57 9 (15.8) 68 1-28 7.6 ⑮ Youngyang-gun  Pungtungia herzi 15 15 (100) 3,736 13-630 249.1  Squalidus chankaensis tsuchigae 1 1 (100) 56 - 56.0  Microphysogobio koeensis 2 2 (100) 54 1-53 27.0  Coreoleuciscus splendidus 8 7 (87.5) 45 1-16 6.4  Acheilognathus signifer 2 1 (50.0) 4 - 4.0  Zacco platypus 24 5 (20.8) 13 1-6 2.6  Subtotal 52 31 (59.6) 3,908 1-630 126.1 ⑰ Gunwi-gun  Pseudogobio esocinus 1 1 (100) 2,105 - 2,105  Squalidus gracills majimae 9 9 (100) 7,463 385-1,875 829.2  Pungtungia herzi 4 4 (100) 3,279 329-1,180 819.8  Squalidus japonicus coreanus 29 29 (100) 6,872 9-875 237.0  Acanthorhodeus gracilis 2 2 (100) 136 54-82 68.0  Zacco platypus 37 9 (24.3) 126 1-77 14.0  Pseudorasbora parva 1 1 (100) 11 - 11.0  Hemibarbus longirostris 4 4 (100) 34 3-13 8.5  Acheilognathus signifer 6 6 (100) 43 2-11 7.2  Zacco temminckii 9 1 (11.1) 3 - 3.0  Acheilognathus yamatsutae 9 1 (11.1) 2 - 2.0  Opsariichthys uncirostris 6 1 (16.7) 1 - 1.0  Coreoperca herzi 3 1 (33.3) 1 - 1.0  Hemibarbus labeo 1 1 (100) 1 - 1.0  Subtotal 111 70 (63.1) 20,077 1-2,105 286.8 Total 220 110 (50.0) 24,053 1-2,105 218.7 Location and fish sp. No. of fish examined No. (%) of fish infected No. of metacercariae detected
Total Range Average ⑱ Gokseong-gun  Ladislabia taczanowskii 2 2 (100) 604 259-345 302.0  Sarcocheilichthys varbgatus 4 2 (50.0) 379 20-359 189.5  Zacco platypus 42 1 (2.4) 118 - 118.0  Pungtungia herzi 12 10 (83.3) 1,139 1-275 113.9  Squalidus japonicus coreanus 12 3 (25.0) 164 20-93 54.7  Abbottina springeri 3 2 (66.7) 27 2-25 13.5  Squalidus chankaensis 4 3 (75.0) 31 4-16 10.3  Hemibarbus longirostris 2 2 (100) 7 2-5 3.5  Cyprinus capio 1 1 (100) 2 - 2.0  Acheilognathus majusculus 4 2 (50.0) 4 - 2.0  Coreoleuciscus splendidus 17 11 (64.7) 18 1-3 1.6  Carassius auratus 13 1 (7.7) 1 - 1.0  Hemibarbus labeo 3 2 (66.7) 2 - 1.0  Subtotal 119 42 (35.3) 2,496 1-359 59.4 ⑲ Gurye-gun  Pungtungia herzi 1 1 (100) 377 - 377.0  Squalidus chankaensis tsuchigae 25 19 (76.0) 771 1-351 40.6  Sarcocheilichthys nigripinis 10 10 (100) 217 6-62 21.7  Microphysogobio koreensis 2 1 (50.0) 14 - 14.0  Siniperca scherzeri 1 1 (100) 4 - 4.0  Hemibarbus longirostris 6 1 (16.7) 3 - 3.0  Pseudogobio esocinus 3 2 (66.7) 2 - 1.0  Acheilognathus yamatsutae 7 1 (14.3) 1 - 1.0  Microphysogobio longidorsalis 1 1 (100) 1 - 1.0  Subtotal 56 37 (66.1) 1,390 1-377 37.6 Total 175 79 (45.1) 3,886 1-377 49.2 Location and fish sp. No. of fish examined No. (%) of fish infected No. of metacercariae detected
Total Range Average ⑳ Youngsan-gang in Naju-si  Squalidus japonicus coreanus 1 1 (100) 815 - 815.0  Acheilognathus lanceolatus 5 5 (100) 730 2-460 146.0  Hemibarbus longirostris 4 4 (100) 215 23-107 53.8  Opsarichthys uncirostris 2 1 (50.0) 28 - 28.0  Pseudogobio esocinus 3 3 (100) 24 1-12 8.0  Acheilognathus yamatsutae 3 2 (66.7) 10 1-9 5.0  Zacco platypus 20 1 (5.0) 2 - 2.0  Hemibarbus labeo 8 5 (62.5) 6 1-2 1.2  Carassius auratus 10 1 (10.0) 1 - 1.0  Subtotal 56 23 (41.1) 1,831 1-460 79.6 ㉑ Tamjin-gang in Gangjin-gun  Pungtungia herzi 6 6 (100) 2,520 95-846 420.0  Sarcocheilichthys varbgatus 15 15 (100) 5,342 65-682 356.1  Gnathopogon strigatus 3 3 (100) 122 30-52 40.7  Pseudorasbora parva 1 1 (100) 6 - 6.0  Acanthorhodeus macropterus 8 5 (62.5) 14 1-9 2.8  Pseudogobio esocinus 3 3 (100) 6 1-3 2.0  Acheilognathus yamatsutae 2 2 (100) 4 1-3 2.0  Hemibarbus longirostris 3 3 (100) 5 1-3 1.7  Zacco platypus 10 1 (10.0) 1 - 1.0  Subtotal 51 39 (76.5) 8,020 1-846 205.6 ㉓ Boseong-gang in Boseong-gun  Pungtungia herzi 2 2 (100) 157 9-148 78.5  Pseudogobio esocinus 2 1 (50.0) 2 - 2.0  Acheilognathus yamatsutae 3 1 (33.3) 2 - 2.0  Zacco platypus 1 1 (100) 1 - 1.0  Subtotal 8 5 (62.5) 162 1-148 32.4 Total 115 67 (58.3) 10,013 1-846 149.4 Year examined and fish sp. No. of fish examined No. (%) of fish infected No. of metacercariae detected
Total Range Average 2006  Pungtungia herzi 24 24 (100) 19,044 324-1,408 793.5  Squalidus chankaensis tsuchigae 7 7 (100) 1,775 100-380 253.6  Pseudogobio esocinus 34 34 (100) 3,643 2-313 107.2  Acheilognathus rhombeus 3 3 (100) 187 37-112 62.3  Acanthorhodeus macropterus 15 10 (66.7) 335 1-83 33.5  Acheilognathus majuscules 25 18 (72.0) 100 1-44 5.6  Hemibarbus longirostris 31 7 (22.6) 13 1-3 1.9  Zacco temminckii 34 4 (11.8) 6 1-3 1.5  Zacco platypus 21 3 (14.3) 3 - 1.0  Subtotal 194 110 (56.7) 25,106 1-1,408 228.2 2007  Pungtungia herzi 44 44 (100) 28,294 106-2,345 707.4  Squalidus chankaensis tsuchigae 2 2 (100) 658 178-480 329.0  Sarcocheilichthys varbgatus 2 2 (100) 551 145-406 275.5  Squalidus gracilis coreanus 2 2 (100) 298 89-209 149.0  Pseudogobio esocinus 16 13 (81.3) 817 1-197 62.9  Sarcocheilichthys nigripinnis 1 1 (100) 11 - 11.0  Hemiculter eigenmmni 2 2 (100) 14 - 7.0  Acheilognathus signifer 6 6 (100) 35 1-16 5.8  Coreoperca herzi 8 1 (12.5) 4 - 4.0  Hemibarbus longirostris 15 8 (53.3) 23 1-10 2.9  Zacco platypus 19 1 (5.3) 2 - 2.0  Acheilognathus koreensis 4 2 (50.0) 4 1-3 2.0  Acheilognathus majusculus 13 9 (69.2) 16 1-4 1.8  Carassius auratus 13 1 (7.7) 1 - 1.0  Odontobutis platycephala 8 1 (12.5) 1 - 1.0  Subtotal 155 95 (61.3) 30,729 1-2,345 323.4 2010  Sarcocheilichthys varbgatus 2 2 (100) 542 240-302 271.0  Pungtungia herzi 78 71 (91.0) 13,143 1-1,286 185.1  Squalidus chankaensis tsuchigae 3 3 (100) 235 48-131 78.3  Pseudorasbora parva 1 1 (100) 45 - 45.0  Acheilognathus rhombeus 2 2 (100) 51 15-36 25.5  Squalidus gracilis coreanus 9 8 (88.9) 191 2-59 23.9  Acheilognathus macropterus 15 11 (73.3) 263 4-98 23.9  Pseudogobio esocinus 60 55 (91.7) 994 1-136 18.1  Zacco platypus 44 5 (11.4) 12 1-8 2.4  Hemibarbus longirostris 22 17 (77.3) 37 1-6 2.2  Acheilognathus majusculus 10 1 (10.0) 1 - 1.0  Subtotal 246 176 (71.5) 15,514 1-1,286 88.1 Total 595 381 (64.0) 71,349 1-2,345 187.3 Items Infection status (%) in fishes from
Northern Middle Southern Total No. (%) of fish examined 1,543 (37.9) 1,167 (28.7) 1,361 (33.4) 4,071 (100) Total positive rate (%) 11/1,543 (0.7) 149/1,167 (12.8) 538/1,361 (39.5) 698/4,071 (17.1) Overall metacercarial density/fish 2.6 163.7 158.8 157.4 Positive rate (%) of P. herzi 9/146 (6.2) 34/107 (31.8) 158/170 (92.9) 201/423 (47.5) Metacercarial density in P. herzi 2.8 214.7 409.3 358.2 Positive rate (%) of Z. platypus 0/247 (0) 17/223 (7.6) 13/228 (5.7) 30/698 (4.3) Metacercarial density in Z. platypus 0 8.6 10.7 9.5
Table 1. Fishesa collected from northern regions (Gangwon-do), Korea

Total 678 freshwater fishes of 36 species were examined.

① Inje-gun (Soyang-gang); ②-1 Hongcheon-gun (Hongcheon-gang, 2003); ②-2 Hongcheon-gun (Hongcheon-gang, 2010); ③-1 Cheolwon-gun (Hantan-gang, 2005); ③-2 Cheolwon-gun (Hantan-gang, 2010); ③-3 Cheolwon-gun (Hwa-gang, 2010).

Table 2. Fishesa collected from northern regions (Gangwon-do), Korea (2009)

Total 865 freshwater fishes of 32 species were examined.

5 localities, ④ Yanggu-gun (Sooip-cheon); ⑤ Yangyang-gun (Namdae-cheon); ⑥ Youngweol-gun (Dong-gang); ⑦-1 Samcheok-si (Osip-cheon); ⑦-2 Samcheok-si (Gagok-cheon).

Table 3. Fishesa collected from middle regions (Chungcheongbuk-do), Korea

Total 451 freshwater fishes of 32 species were examined.

3 localities, ⑧ Okcheon-gun (Gum-gang); ⑨ Goisan-gun (Cheong-cheon); ⑩ Daecheong-ho (Lake).

Table 4. Fishesa collected from middle regions (Gyeongsangbuk-do), Korea

Total 716 freshwater fishes in 35 species were examined.

⑪ Ahndong-si; ⑫ Sangju-si; ⑬ Bonghwa-gun; ⑭ Yecheon-gun; ⑮ Youngyang-gun; ⑯ Youngdeok-gun; ⑰ Gunwi-gun.

Table 5. Fishesa collected from southern regions (Jeollanam-do), Korea

Total 452 freshwater fishes of 35 species were examined;

⑱ Gokseong-gun (Seomjin-gang); ⑲ Gurye-gun (Seomjin-gang); ⑳ Naju-si (Youngsan-gang); ㉑Gangjin-gun (Tamjin-gang); ㉒ Jangheung-gun (Tamjin-gang);㉓Boseong-gun (Boseong-gang).

Table 6. Fishesa collected from southern regions (Ulsan Metropolitan City and Gyeongsangnam-do), Korea

Total 909 freshwater fishes of 24 species were examined;

㉔ Ulsan Metropolitan City (Taehwa-gang); ㉕-1 Sancheong-gun (Yangcheon-gang, 2006); ㉕-2 Sancheong-gun (Yangcheon-gang, 2007); ㉕-3 Sancheong-gun (Yangcheon-gang, 2010).

Table 7. Prevalence and density of C. sinensis metacercariae in fishes from Chungcheongbuk-do, a middle region of Korea
Table 8. Prevalence and density of C. sinensis metacercariae in fishes from Nakdong-gang, Gyeongsangbuk-do, a middle region of Korea
Table 9. Prevalence and density of C. sinensis metacercariae in fishes from Seomjin-gang (River), Jeollanam-do, a southern region of Korea
Table 10. Prevalence and density of C. sinensis metacercariae in fishes from rivers in Jeollanam-do, southern regions of Korea
Table 11 Prevalence and density of C. sinensis metacercariae in fishes from Yangcheon-gang (River), Sancheong-gun, Gyeongsangnam-do, a southern region of Korea
Table 12. Comparative prevalencea and densitya of C. sinensis metacercariae in fishes from 3 latitudinal regions

Prevalence: no. of fish infected/no. of fish examined×100; density: mean no. of metacercariae per infected fish.

Table 1.

Table 2.

Table 3.

Table 4.

Table 5.

Table 6.

Table 7.

Table 8.

Table 9.

Table 10.

Table 11

Table 12.

PHD : Parasites, Hosts and Diseases

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