• Parasites, Hosts and Diseases
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• 제59권3호
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• pp.265-271
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• 2021

We surveyed on the infection status of zoonotic trematode metacercariae (ZTM) in freshwater fishes from Soyang-cheon (a branch stream of Mangyeong-gang) in Wanju-gun, Jeollabuk-do, the Republic of Korea. A total of 927 fishes were individually examined with the artificial digestion method during 2013-2015 (462 fish in 15 spp.) and 2018-2019 (465 fish in 25 spp.). Clonorchis sinensis metacercariae were detected in 207 (31.4%) out of 659 fishes in 14 positive fish species (PFS), and their mean intensity was 114 per fish infected (PFI). Metagonimus spp. metacercariae were found in 302 (37.4%) out of 808 fishes in 21 PFS, and their mean intensity was 12 PFI. Centrocestus armatus metacercariae were detected in 222 (59.0%) out of 376 fishes in 12 PFS, and their mean intensity was 383 PFI. Echinostoma spp. metacercariae were found in 139 (22.1%) out of 628 fishes in 10 PFS, and their mean intensity was 7 PFI. Clinostomum complanatum metacercariae were detected in 14 (6.5%) out of 214 fishes in 4 PFS, and their mean intensity was 2.4 PFI. Metorchis orientalis metacercariae were detected in 36 (13.5%) out of 267 fishes in 5 PFS, and their mean intensity was 4.3 PFI. Conclusively, the prevalence and infection intensity of ZTM is generally not so high in fishes from Soyang-cheon. However, those of C. sinensis metacercariae are more or less higher in 2 fish species, Pungtungia herzi and Sarcocheilichthys variegatus wakiyae.

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 2001년도 추계 수산관련학회 공동학술대회발표요지집
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• pp.313-314
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• 2001

The palaemonid shrimp Exopazaemon modestus inhabits the freshwater of the Indo-West Pacific, Siberia, Manchuira, Korea, China, Taiwan (Holthuis, 1980) and is abundant in the fresh water areas of southwest of Korea. Palaemonid shrimps are adapted to a variety of habitats in freshwater, brackish and marine environments. They play important role in the ecosystem of fresh, brackish and marine waters, acting as predators feeding on algae, detritus, crustaceans and meiofauna (Bell and Coull, 1978) and in turn, as preys for fishes and other predators (Anderson, 1985). (omitted)

• 생태와환경
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• 제53권2호
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• pp.156-164
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• 2020

The accurate estimation of fish assemblages is highly dependent on the sampling gear used for sampling. We used data from 15 sampling sites along the Nakdong River, which is a large river in South Korea, to identify differences in assemblages and sizes of freshwater fishes collected with either cast nets or gill nets, the two most commonly used sampling gear in South Korea. The two gears differed in the fish assemblages they captured, with more species caught by gill nets. Further, due to its tighter mesh size, the cast net caught significantly smaller fishes than the gill nets(independent t-test, p<0.05). We found the cast net to be appropriate for species that inhabit shallow (less than 2 m) and open water, but inappropriate for deep water, habitats with plant beds, and nocturnal species. Thus, cast net sampling is not efficient in a large river environment, and a combination of sampling methods is more suitable for understanding fish assemblages in such habitats. In general, appropriate selection of fishing methods to specific habitats is necessary to improve data quality and minimize the misrepresentation of environmental conditions.

• 한국어병학회지
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• 제3권2호
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• pp.51-60
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• 1990

제주도내(濟州道內)의 담수어류(淡水魚類)에 기생하고 있는 기생충(寄生蟲)의 감염 실태를 조사하여 생물학적인 관점에서는 물론 이들 하천수(河川水)를 이용하여 양식(養殖)을 할 경우 예상될 수 있는 기생충의 감염을 예방하기 위한 기본 자료의 수집을 위하여 도내(道內) 21개 하천(河川) 및 저수지(貯水池)에 서식하는 담수(淡水) 및 기수어류(汽水魚類)를 대상으로 기생충(寄生蟲)의 감염 실태를 조사한 결과는 다음과 같다. 조사(調査)된 어류 기생충 중에 원충류(原蟲類)가 가장 많아 섬모충류(纖毛蟲類)가 4종, 포자충류(胞子蟲類)가 3종, 편모충류(鞭毛蟲類)가 1종, 흡관충류(吸管蟲類)가 1종으로 나타났고 편형동물(編形動物)에 속하는 단생흡충류(單生吸蟲類)가 2종, 이생흡충류(二生吸蟲類) 등과 조충류(條蟲類), 선충류(線蟲類), 구두충류(鉤頭蟲類) 및 기생성갑각류(寄生性甲殼類) 외에 환형동물(環形動物) 중의 거머리가 1종 확인되었고, 수생균(水生菌)의 기생도 확인되었다. 기생충 중에 가장 높은 감염 빈도를 보인 것은 원충류인 Trichodina sp.로서 총 채집 어류 311 마리 중 18.3%의 감염율을 보였고 두번째가 선충류(線蟲類)로서 13.5%, 그 다음이 아가미 흡충(吸蟲)으로 4.8%였으며 구두충류(鉤頭蟲類), 이생흡충류(二生吸蟲類)의 순서로 각각 감염율은 4.2%, 2.6%였다. 16종의 어류중 망둑어과에 속하는 실망둑이 단일 어종으로는 가장 높은 기생충의 감염율을 보였고, 하천(河川) 및 저수지(貯水池) 등의 서식 수역 별 기생충 발현빈도(發現頻度)를 보면 옹포천에서 7종의 기생충이 서식하고 있어서 가장 빈도수(頻度數)가 높았으며 그 다음이 화북천, 하귀, 하도리의 기수역 및 고산 저수지로 5종류의 기생충이 서식하고 있었다. 기생충이 전혀 서식하지 않는 곳으로 알려진 것이 광령계곡, 도순천, 강정천 및 효돈천으로 채집 어류수가 각각 10마리, 15마리, 16마리 및 8마리였으나 기생충의 감염이 보이지 않았다.

• 한국수산과학회지
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• 제49권1호
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• pp.7-12
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• 2016

Total mercury (TM) is a hazardous element that is of particular concern to human health. Due to the diversity of dietary habits among fishes, tissue-specific analysis of hazardous elements is necessary. In this study, the tissue-specific TM in cultured fish was analyzed to conduct risk assessment. The highest concentrations of TM were found in the farmed marine fish Pagrus major (0.111 mg/kg) and in the farmed freshwater fish Channa argus (0.162 mg/kg). TM concentration was significantly correlated with total fish length (P<0.01). Significant differences in TM were found between three types of fish tissue, with the concentration in fish muscle being significantly higher than those of gill or liver (P<0.01). Moreover, the tissue-specific TM concentrations of farmed freshwater fish were significantly higher than those of farmed marine fish (P<0.01). According to the risk assessment, the TM body exposure rate of muscle and liver in cultured fishes ranged from 0.001 to 0.389% of the Provisional Tolerable Weekly Intake. Therefore, these results showing the tissue-specific TM contents of cultured fish could be useful to assess the health risks of Korean dietary habits.

• Parasites, Hosts and Diseases
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• 제46권2호
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• pp.109-112
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• 2008

A parasitological investigation on trematode metacercariae was made on 62 freshwater fishes of 13 species in northern Thailand; Cyclocheilichthys apogon, Puntioplites proctozysron, Labiobarbus siamensis, Barbodes gonionotus, Barbodes altus, Henicorhynchus siamensis, Osteochilus hasselti, Notopterus notopterus, Mystacoleucus marginatus, Anabas testudineus, Systomus orphoides, Morulius chrysophykadian, and Hampala macrolepidota. The fish were caught over the summer period (February-May 2007) from 2 Chiang Mai water reservoirs, i.e., the Mae Ngad (UTM 47Q E 503200, 47Q N 2119300) and the Mae Kuang Udomtara (UTM 47Q E 513000, 47Q N 2092600) Reservoirs in Chiang Mai province, Thailand. The prevalence of heterophyid (Haplorchis taichui and Haplorchoides sp.) metacercariae in these fish was 83.9% and 74.2% in the Mae Ngad and Mae Kuang Udomtara Reservoirs, respectively. The highest intensity of heterophyid metacercariae in H. siamensis in the Mae Ngad was 120.4 and that in P. proctozysron in the Mae Kuang Udomtara was 180.0. The fish, A. testudineus, C. apogon, and M. chrysophykadian, were not found to be infected with H. taichui metacercariae. The results show that the freshwater fish in Chiang Mai water reservoirs are heavily infected with H. taichui and Haplorchoides sp. metacercariae.

• 한국환경생태학회지
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• 제7권2호
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• pp.192-206
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• 1994

국립공원에서 자연보존의 일환으로 기초자료를 축적하고자 1993년 5월부터 11월까지 덕유산국립공원 일대의 9개 지소에서 담수어류상을 조사한 결과 한국고유종 및 아종인 칼납자루, 긴몰개, 돌마자, 금강모치, 참종개, 미유기, 동사리를 포함한 5개과 17종의 담수어류를 확인하였다. 금강수계에서는 16종이, 낙동강수계에서는 8종이 분포하였으며 공통적으로 분포하는 어종은 긴몰개, 돌마자, 돌고기, 버들치, 갈겨니, 미꾸리 및 동사리로서 7종이었고 우세종은 버들치, 갈겨니 그리고 동사리였다. 한편 한국산 담수어의 형태에 관한 기초자료 축적의 일환으로 이지역에서 채집된 담수어 17종의 척추골수를 soft X-ray를 활용하여 그 분석결과를 보고함과 아울러 수계의 환경훼손에 따른 어류의 비정상적 골격형질 발현양상 파악결과의 활용가능성을 검토하였다.

• Parasites, Hosts and Diseases
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• 제60권2호
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• pp.79-96
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• 2022

The infection nature of Clonorchis sinensis metacercariae (CsMc) in freshwater fish hosts is closely related to the transmission of human clonorchiasis. This article reviewed the infection characteristics of CsMc in freshwater fish in the Republic of Korea (Korea). The status of CsMc infection was examined in a total of 17,792 cyprinid fish of 49 species in 9 water systems, which included Hantan-/Imjin-gang, Han-gang, Geum-gang, Mangyeong-gang, Yeongsan-gang, Tamjin-gang, Seomjin-gang, Nakdong-gang, and streams in the east coastal areas from 2010 to 2020. The infection status of CsMc was examined according to cyprinid fish species and water systems, after which analyzed by endemicity and susceptibility index. The high endemicity was shown in the cyprinid fish from 3 regions (6.1%) in the upper reaches of Nakdong-gang, such as Banbyeon-cheon (stream), Yongjeon-cheon, and Wi-cheon. The moderate levels were observed in fishes from 8 regions (16.3%), and low endemicity was shown in fishes from 20 regions (40.8%). No CsMc were detected in fish from 18 regions (36.7%). The susceptibility of CsMc in index fish, Puntungia herzi, was found to be a reliable index without examination of other fish species. CsMc infection rates were closely related to subfamily groups in the cyprinid fish hosts in a highly endemic area. In Korea, a total of 58 fish species in 10 families has been listed as the second intermediate hosts for C. sinensis. This review provides several novel features of CsMc infection and clarifies the species of second intermediate freshwater fish host in Korea.

• Parasites, Hosts and Diseases
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• 제59권1호
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• pp.97-101
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• 2021

The infection status with Clonorchis sinensis metacercariae (CsMc) was examined in freshwater fishes from Yongjeon-cheon (a branch of Nakdong-gang) located in Cheongsong-gun, Gyeongsangbuk-do, the Republic of Korea (Korea). A total of 750 fishes in 19 species were examined by the artificial digestion method for 2 years (2019 and 2020). CsMc were detected in 378 (51.4%) out of 735 fishes in 14 species (73.7%), and the infection intensity was 666 per fish infected. In 2019, CsMc were found in 172 (68.0%) out of 253 fishes in 10 species, and the infection intensity was 565 per fish infected. In 2020, CsMc were detected in 206 (62.2%) out of 331 fishes in 10 species, and the infection intensity was 751 per fish infected. The other zoonotic trematode, ie. Metagonimus spp., Centrocestus armatus, Echinostoma spp. and Clinostomum complanatum, metacercariae were also detected in fishes from the survey streams, but their endemicities were relatively low. Conclusively, it was first confirmed that CsMc are highly endemic in fishes from Yongjeon-cheon in Cheongsong-gun, Gyeongsangbuk-do, Korea.

• 환경생물
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• 제33권3호
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• pp.314-329
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• 2015

섬진강의 본류와 지류를 대상으로 2010년 5월부터 2013년 9월까지 어류상을 연구한 결과, 총 13목 41과 81속 107종 37,751개체가 확인되었다. 출현어류 중에서 1차 담수어류는 57종 (53.3%), 2차 담수어류는 10종 (9.3%), 해산어류는 40종 (37.4%)으로 확인되었다. 전체 우점종은 피라미 Zacco platypus (28.7%), 아우점종은 참갈겨니 Z. koreanus (15.0%)로 나타났다. 한국 고유종은 전체 21종 (31.3%)이 출현하였으며 보성강 수계에서 19종으로 다양하게 확인되었다. 환경부지정 멸종위기 야생동물 I급인 임실납자루 Acheilognathus somjinensis, II급인 다묵장어 Lampetra reissneri와 모래주사 Microphysogobio koreensis 등 3종이었다. 외래종은 모두 3종으로 떡붕어 Carassius cuvieri, 블루길 Lepomis macrochirus 및 베스 Micropterus salmoides였다. 얼록동사리 Odontobutis interrupta는 섬진강 수계에 이입되어 서식하는 것으로 추정되었다.