• 한국해양학회지
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• 제29권1호
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• pp.1-4
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• 1994

완도 해역에서 1990년 4월에서 1991년 3월까지 숙주 어류인 풀망둑을 월별 채집하 여 기생성 요각류 Acanthochondria brevicorpa를 조사하였다. 감염률은 숙주 크기와 양의 상관이었다. 기생성 요각류는 전장이 24 cm 이상되는 어류에서만 채집되었다. 숙 주가 잡히지 않아 1990년 4, 6, 7월의 자료를 얻을 수 없었음에도 불구하고 A. brevicorpa의 감염률과 감염강도에서 뚜렷한 계절변동이 나타났다. 채집된 어류 83마 리 중 34.9%가 요각류가 전혀 발견되지 않았다. 포란한 요각류는 2월과 5월 사이에 나 타났으며, 5월에 가장 많이 출현하였다. 요각류의 유생 중 CC에서 CIII 유생은 조사기 간에 1마리도 채집되지 않았으며, 3월과 5월에 CIV와 CV 유생이 약간 발견되었을 뿐이 었다. 본 연구결과에서 요각류 A.brevicorpa는 주로 봄에 생식하고, 추가적인 숙주를 포함하는 생활환을 갖는 것으로 추정되었다.

• 미생물학회지
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• 제41권3호
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• pp.157-163
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• 2005

요각류 Paracyclopina nana Acetate Kinase를 클로닝하였다. 전체 open reading frame은 1,200 bp이었으며, poly(A) signal sequence가 ORF에 내재되어 있었다. 분자계통학적 분석결과 P. nana acetate kinase 유전자는 진핵생물계 곰팡이류인 Aspegillus와 같은 branch를 형성하였고, P. nana acetate kinase가 다른 원핵미생물들의 acetate kinase와는 구별되며 fungi와 같은 branch에 존재하는 것을 확인하였다. 또한, E. coli를 이용하여 원핵세포 발현벡터를 이용한 단백질 발현 유도를 통하여 P. nana acetate kinase 단백질 분자량이 약 50 kDa에 이르는 것을 확인하였다. 이 자료는 본 요각류와 다른 생물의 acetate kinase 단백질의 생화학적 특성비교에 유용하게 쓰이리라 사료된다.

• Journal of Species Research
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• 제5권3호
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• pp.289-299
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• 2016

Extensive survey of invertebrates in Korea, led by the National Institute of Biological Resources in Incheon, continues to uncover many new and endemic species, but also elements of neighbouring faunas that were previously unknown here. Hemicyclops tanakai Itoh and Nishida, 2002 was originally described from estuarine mud-flats in Tokyo Bay, Japan. We report one male and two females from a sandy beach on Jeju Island, which represent its first record in Korea and second record ever. No morphological differences were observed between these two disjunct populations, so we expect more records of this species in Korea and Japan. Tisbe ensifer Fischer, 1860 was originally described from Madeira and later on reported from numerous other parts of the Northern Atlantic, as well as from the Indian Ocean. We report two females from a shallow littoral in Sokcho, which represents its first record in Korea and the first record in the entire Pacific Ocean. Because of morphological discrepancies reported in previous records we recognize that this species might be in reality a species complex, and we only tentatively identify our Korean specimens as T. cf. ensifer. We provide numerous light photographs of both species in addition to short descriptions, in hope that they might elucidate global problems of their zoogeography and dispersal of small marine invertebrates in general. Further samplings from Korea and other parts of the world will be necessary to test our identifications and phylogenetic relationships of Korean populations with molecular and other tools.

• 수산해양기술연구
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• 제34권3호
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• pp.320-327
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• 1998

1987년 2월부터 1988년 1월까지 낙동강 하구해역에서 채집된 전갱이(체장 4~15cm)의 식성을 조사하였다. 전갱이의 주요 먹이생물은 요각류(Copepoda), 단각류(Amphipods), 공쟁이류(Mysidacea)등의 갑각류였다. 특히 요각류가 위 내용물 중 차지하는 비율이 매우 높았다. 그 외에 십각류(Decapoda), 난바다공쟁이류(eEuphausiacea), 모악류(Chaetognatha), 갯지렁이류(Polycheata), 어란 및 자어 등이 위내용물 중 소량 발견되었다. 요각류 중에서는 Paracalanus parvus, Acartia clausi 그리고 Calanus sinicus 가 많이 섭이되었는데, 특히 C. sinicus에 대한 선호도가 높았다. 전갱이가 성장함에 따라 먹이생물의 조성이 점차 변하였다. 작은 전갱이들은 그들의 먹이를 요각류에 거의 전적으로 의존하였으나, 체장이 증가하면서 위내용물 중 요각류가 차지하는 비율은 점차 감소하였으며, 그 대신 비교적 큰 먹이생물인 단각류 및 곤쟁이류의 점유율은 점차 증가하였다.

• 한국어병학회지
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• 제11권2호
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• pp.119-127
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• 1998

기생성 요각류 2종, Clavellopsis hugu(Lernaeopodidae; Siphonostomatoida)와 Taeniacanthus yamagutii(Taeniacanthidae; Poecilostomatoida)이 한국산 양식 황복의 구강, 코, 표피 등에 기생하고 있음을 국내에서 처음으로 보고하며, 아울러 이종의 형태학적 특징을 상세히 기술하였다. Clavellopsis huge의 체형, 제2 촉각, 큰 턱 및 제2 소악 등은 다른 종과 쉽게 구별된다. 암컷의 두흉부는 동쪽으로 휘어져 있으며, 제2 촉각은 2분지, 큰 턱의 날은 톱니 모양, 제2 소악은 두흉부 기저에 완전히 융합될 bulla 형태이다. 수컷의 두흉부와 몸통은 완전히 융합된 난형이며, 두쌍의 악각은 집게형이다. Taeniacanthus yamagutii의 주요 특징은 제2소악이 견고하고, 악각의 갈고리 기저에 돌기가 있으며, 제2-4 바깥 다리의 가시 끝에 촉각이 1개씩 있다. 이들은 모두 한국 미기록종이며, 양식산 복어(Takifugu obscurus)는 새로운 숙주이다.

• 한국어류학회지
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• 제28권1호
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• pp.41-46
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• 2016

2011년 6월에서 8월까지 거제 연안에서 RN80으로 채집된 살망둑 (Gymnogobius heptacanthus) 치어 229개체의 소환관 내용물 조성을 조사하였다. 살망둑 치어의 체장은 14~29 mm의 범위를 보였으며, 요각류 (Copepoda)가 가장 우점한 먹이생물이었다. 요각류 다음으로는 만각류 (Cirripedia)의 Cypris 유생이 우점하였으며, 그 외 지각류 (Cladocera), 십각류 (Decapoda) 등도 섭식하였으나 그 양은 많지 않았다. 살망둑 치어의 섭식전략과 섭식패턴을 알아보기 위하여 도해적방법을 이용한 결과, 요각류 중 긴노요각목 (Calanoida)이 출현빈도와 특정먹이 생물우점도에서 가장 높게 나타나 살망둑 치어는 긴노요각목을 가장 우점적으로 섭식하는 종임을 알 수 있었다. 살망둑 치어는 모든 체장군에서 요각류를 주로 섭식하였으며, 요각류 중 긴노요각목이 가장 우점하였다.

• 한국수산과학회지
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• 제49권5호
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• pp.635-641
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• 2016

The feeding habits of juvenile and young Seriola quinqueradiata, which were collected by a hand net and set net in coastal waters of the South Sea during the period from June to August 2014 and 2015, were analyzed. The size range of juveniles was 4.9-10.9 cm FL, and that of young S. quinqueradiata was 11.0-20.4 cm FL. Important prey items in the diets of juveniles were euphausiacea and copepoda, dominated by the Euphausia sp., Paracalanus sp. and Calanus sinicus while the diets of the young consisted mainly of pisces, dominated by Engraulis japonicus, Trachurus japonicus. Stomach content compositions differed significantly among body size levels in both the juveniles and young (ANOSIM, P<0.05). With increasing size, the mN/ST constantly decreased while the mW/ST constantly increased (one-way ANOVA). Graphical analysis of the diet composition showed that juvenile S. quinqueradiata are generalized feeders, young is a specialized feeders characterized by strong individual feeding specialization.

• Journal of Species Research
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• 제1권1호
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• pp.4-34
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• 2012

Parastenocaris koreana sp. nov. is described based on examination of numerous adult specimens of both sexes from several localities in Korea. Scanning electron micrographs are used to examine intra- and interpopulation variability of micro-characters, in addition to light microscopy. The new species is most closely related to the Japanese P. biwae Miura, 1969, which we redescribe based on newly collected material from the Lake Biwa drainage area. The two species differ in size, relative length of the caudal rami, shape of the anal operculum, shape of the genital double somite, relative length of the inner distal process on the female fifth leg, as well as relative length of the apical setae on the second, third, and fourth legs exopods in both sexes. Detailed examinations of three disjunct populations of P. koreana reveal also some geographical variation, especially in the surface ornamentation of somites, which may indicate some population structuring or even cryptic speciation. Lack of intraspecific variability in the number and position of sensilla on somites, as well as their potential phylogenetic significance, is a novel discovery. Both species examined here belong to the brevipes group, which we redefine to include 20 species from India (including Sri Lanka), Australia, East Asia, Northern Europe, and North America. A key to species of this group is also provided. In order to test the monophyly of the redefined brevipes group with highly disjunct distribution, as well as relationship between different species, a cladistics analysis is performed based on 39 morphological characters and with help of three outgroup taxa. Six equally parsimonious cladograms are generated, all of which show that the ingroup is well defined by at least three synapomorphies. Reconstructed phylogeny questions the previously suggested hypothesis about the origin of this group in South East Asia, with one Australian species showing the most basal position. We speculate that the present distribution of this group may be a combination of ancient vicariance and subsequent dispersal, with a possible origin in the Gondwanaland, in the rift valley between Australia and India.

• 한국수산과학회지
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• 제51권1호
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• pp.47-53
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• 2018

The presence of pathogens in wild fish is a potential threat to the fish being raised nearby fish farm. Surveillance of these pathogens in the wild is, thus, highly important to keep fish in the farm safe from serious communicable diseases. Fish and crustacean were sampled 4 times at Soyang Lake in 2016. Pathogens for five reportable communicable diseases including KHVD (koi herpesvirus disease), SVC (spring viraemia of carp), EUS (epizootic ulcerative syndrome) and WSD (white spot disease), and parasites were investigated. In Soyang Lake, pale chub Zacco platypus was the most abundant. Forty seven pale chub, 8 Korea piscivorous chub Opsarichthys uncirostris, 3 oily shiner Sarcocheilichthys variegatus wakiyae and 2 crucian carp Cyprinus carassius were investigated for detection of target diseases of fish. Seventeen Caridina denticulata denticulata, 12 Oriental river prawn Macrobrachium nipponense and 1 Chinese mitten crab Eriocheir sinensis were used for detection of WSD. As the result, reportable communicable diseases were not detected in all the freshwater animals. Dactylogyrus was detected in Korea piscivorous chub. Copepoda was also detected in pale chub and Korea piscivorous chub. Metacercaria was detected in the pale chub sampled in September and October. Those were not metacercaria of liver fluke Clonorchis sinensis.

• 환경위생공학
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• 제23권4호
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• pp.45-54
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• 2008

Our study indicates the zooplankton abundance with characteristics of water column and the vertical distribution in Lake Jinyang, South Korea. Seasonal changes of zooplankton community are determined by environmental parameters like water temperature, pH, dissolved oxygen, suspended solids and chlorophyll a. In lake Jinyang, this study showed that the zooplankton abundance in transition zone(St.1, St.2) was higher density than in lacustrine zone(St.3). Rotifers were dominant zooplankton and among them, Polyarthra spp., Keratella spp. and Nauplli(Copepoda) were common. But Cladoceran showed the low density. During survey period, zooplankton abundance with vertical distribution in surface layer(epilimnion) was higher than in bottom layer(hypolimninon). Zooplankton densities in Surface and middle layer showed positive relationship with water temperature and the densities in bottom layer(hypolimnion) showed positive relationship with chlorophyll a. Our assumption in spite of the short term study are supported by the facts that increase of temperature driven by climate change more maintains the thermocline duration by the summer temperature stratification. Thus the results suggest that the climate changes are an important source of changing zooplankton community feeding phytoplankton. So the zooplankton should be monitoring by the ecological management of Lake Jinyang to cope with climate changes like flood plain or drought.