• Journal of Species Research
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• v.6 no.spc
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• pp.8-14
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• 2017

Taeniacanthid copepods Anchistrotos kojimensis Do and Ho, 1983 were collected from the branchial cavities of stichaeid fish, Ernogrammus hexagrammus (Schlegel) and yellowfin goby, Acanthogobius flavimanus (Temminck and Schlegel) in Korean waters. Here, we provide the first description of a male of Anchistrotos Do and Ho, 1983. A close comparison of the specimens of A. kojimensis collected from Korea with the original description revealed differences in the adult female: (1) the caudal ramus bears seven setae (seta I minute); (2) the maxillule with small knob-like process anteriorly; (3) leg 5 ornamented with patched spinules distally and having row of spinules at base of each spine and distal seta. The first description of the adult male reveals the following features: (1) the distal abdominal somite had rows of spinules anteriorly and near insertion of each caudal ramus; (2) the postantennal process is more elongate than in the female; (3) the basis of maxilliped is with two prosimomedial setae, two longitudinal rows of stout denticles found on posteromedial surface and row of spinules on anteromedial surface; and (4) the second endopodal segment is a strongly curved claw, with a row of stout denticles along a concave margin, two long and one small setae.

• Animal Systematics, Evolution and Diversity
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• v.21 no.1
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• pp.93-110
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• 2005

A taxonomic study on the genus Mesocyclops has been accomplished as one of the serial researches on the freshwater cyclopoid cope pods in South Korea. As a result, five species are recognized: M. leuckarti (Claus), M. pehpeiensis Hu, M. dissimilis Defaye and Kawabata, M. woutersi Van de Verde, and M. mariae Guo. Of these, M. dissimilis, M. woutersi, and M. mariae are new to Korean fauna. Morphological details of each species and the intraspecific variabilities are commented. A key to the species of genus Mesocyclops known from Korea is provided.

• Animal Systematics, Evolution and Diversity
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• v.21 no.2
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• pp.137-156
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• 2005

A taxonomic study on the Eucyclops serrulatus species group has been accomplished as one of the serial researches on the freshwater cyclopoid copepods in Korea. As a result, the 'Eucyclops serrulatus', hitherto known from Korea through many reports and papers, turns out to be a species complex of six sibling species: E. serrulatus (Fischer), E. roseus Ishida, E speratus (Lilljeborg), E. pacificus Ishida, E. ohtakai Ishida, and I tsushimensis Ishida Taxonomic accounts on their detailed interspecific discrepancies and intraspecific variabilities are presented. A key to the Eucyclops serrulatus group from the Far East is also provided.

• Animal Systematics, Evolution and Diversity
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• v.32 no.3
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• pp.219-229
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• 2016

Material of a Bryocamptus species, formerly reported as B. umiatensis Wilson, 1958 from Sakhalin and South Korea, is here recognized as a distinct new species. Specimens of both sexes were recently obtained from an alpine wetland, Sumeunmulbaengdui, located in the Hallasan National Park, Korea, and newly registered as a Ramsar Wetland in 2015. The new species, B. jejuensis n. sp., differs from the type population of B. umiatensis from Alaska by the smooth margin of the anal operculum in both sexes, the peculiarly modified terminal seta on the distal endopodal segment of the male leg 3, the sword-like spinous seta on the distal endopodal segment of the male leg 4, and the presence of a setule row on the inner distal margin of the caudal rami in the female. Both sexes of the new species are described in detail with particular reference to the male characters. A revised key to the seven species of the genus Bryocamptus Chappuis, 1929 occurring in Korean waters is provided.

• Journal of fish pathology
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• v.7 no.2
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• pp.83-94
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• 1994

Bonnierilla namhaesius n, sp, is described based on the specimens recovered from the ascidians, Halocynthia roretzi Von Drasche in Namhae Islands, Korea, This is distinguished from congeners by having a combination of characters : setal formula 3, 17+1 hook, 9+1 aesthete, 5, 3, 2, 2+1 aesthete, 7+1 aesthete respectively on eight segments of antennule, II, 5 on distal segment of the second leg to fourth leg exopod, and 2, 3, I on distal margin of caudal ramus. This is the second record of the male, and first record of the copepodid in the genus Bonnierilla.

• Journal of Species Research
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• v.1 no.1
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• pp.56-67
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• 2012

During a study of harpacticoid copepods from Korea, one species of the family Orthopsyllidae was found by rinsing macroalgae collected from the intertidal and subtidal zones at Hangaechang, Munseum Islet in Jeju Island of Korea. The Orthopsyllus is closely related to Orthopsyllus linearis curvaspinata Mielke, 1993, however it is distinguished from the original description by the combined characters of slightly slender caudal seta V in the female, relatively short and ovoid caudal ramus, the seta formula of P3, and the length of P2 and P4 endopod in the male. Since Orthopsyllus linearis (Claus, 1866) is notorious for its incomplete previous descriptions and therefore its polymorphic status, it is premature to fix the status of present Orthopsyllus species from Korea, without the detailed comparative study among the congeners. However due to the urgent need for the report of the genus in the region, we report this species as Orthopsyllus linearis (Claus, 1866) like but different one within the genus: Orthopsyllus cf. linearis (Claus,1866). This is the first report of the genus Orthopsyllus for the first time in Korea.

• 한국해양학회지
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• v.19 no.1
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• pp.1-10
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• 1984

an analysis of stomach contents of skipjack tuna Katsuwonus pelamis and plankton samples collected during troll fishing operations showed that the abundance of some dominant organisms in tuna stomachs was related to their abundance in the plankton. Fish larvae mainly pilchards, Nyctiphanes australis, brachyuran and other decapod larvae and calanoid copepods are important food item for skipjack. The copepods Undinula vulgaris and Nannocalanus minor occurred consistently throughout the survey period in both stomach contents and plankton samples. U. vulgaris appeared to be a preferred food considering its high percentage composition in tuna stomachs compared with its low percentage composition in the plankton. Temora turbinata and N. minor may also serve as important food items for skipjack. The largest catches of the fish were made in January and February when plankton organisms were composed dominantly of N. australis, copepods and brachyuran larvae. The main stomach contents during this period were N. australis and brachyuran larvae.

• Animal cells and systems
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• v.14 no.4
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• pp.351-360
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• 2010

A new species of the Cletopsyllidae belonging to the genus Isocletopsyllus Huys and Lee, 1999 is described from the materials collected from subtidal sandy bottoms at Jeju Island and Ulleung Island, Korea. So far, only two species of the genus Isocletopsyllus, viz. I. tertius (Por, 1964) from Israel and I. quartus (Soyer, 1966) from Banyuls-sur-Mer (France) are recorded, both from the Mediterranean Ocean. The new species can be clearly distinguished from its congeners by the combination of the following characters: (1) female antennule with a large process on the outer margin of first segment, (2) caudal rami with a bulbous proximal inner expansion, and shorter than those of other species (about four times long as wide in the new species), (3) second segment of P1 exopod with a short rod-like inner seta, (4) sexual dimorphism presented in the second endopodal segment of male P2, not in exopod of P4, and (6) female P5 with a very long exopod with very short second outer seta. A table comparing the modifications of swimming legs in the family Cletopsyllidae Huys and Lee, 1999 is presented. This is the first record of this family from Korea.

• Korean Journal of Ecology and Environment
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• v.33 no.2 s.90
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• pp.176-186
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• 2000

The present study was carried out to clarify the structure and dynamics of copepod community and the relationship between this community and environmental factors during the period from February 1998 to July 1999. Copepods consists of 21 genera and 32 species, monthly variations of number of species were 15 species in May, 1998 and 2 species November, 1998. The number of species were 22 species in station 12 and station 1, 2, 3 occurred nauplii of copepoda only. Average abundance ranged from $8,330\;ind./m^3$ (in June, 1999) to $177\;ind./m^3$ (in November, 1998). Relationships between water temperature and number of species were as follows: 20 species occurred from 20.1 to $25.0^{\circ}C$ and nuplii of copepoda only occurred from 0.0 to $5.0^{\circ}C$. The number of species by salinity range were 19 species in $20.1{\sim}25.0%_o$ and 9 species in $0{\sim}0.5%_o$. The number of species by trophic state index (TSIm) of chlorophyll a were 25 species in oligotrophic state and 9 species in eutrophic state. Relationships between pH and number of species were as follows: 20 species occurred from 7.6 to 8.0 and from 9.1 to 9.5 was none. The number of species by DO range were 22 species in 6.5 to 7.5 mg/l and 1 species in 14.5 to 15.5 mg/l. The percentage calculated effect by stepwise multiple regression of the pearson correlation coefficient value of environmental factors and copepoda abundance (station 1-station 4) revealed that positive effect was 15.49% in COD, 25.86% in $Cl^-$, 19.75% in $NO_2-N$ and negative effect was 28.30% in $NO_3-N$. Also, Positive effect (station 5-station 12) revealed that 29.49% in water temperature, 28.27% in $NO_3-N$, 22.87% in $NO_2-N$ and negative effect was 30.18% in conductivity and 13.53% in DO.

• Journal of fish pathology
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• v.9 no.1
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• pp.11-13
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• 1996

Ergasilus sieboldi, a parasitic Copepoda, was detected from the gill of Silurus asotus fingerling(7~10 cm long) cultured at a fish farm in Chungnam Province (Fig. 1 and 2). The infected fish did not show any particular external symptoms except a feeble swimming around the boarder of the pond. The isolated parasite was of 1.07 mm in body length with two egg sacks of 1.05 mm and one pair of hook-shaped secondary tentacle. Bychowsky(1963) described that this parasite infected the gill of Salmonidae, Serranidae, Cyprinidae and Siluridae and that the fish in the Baltic Sea, Black Sea. Caspian Sea. Japanese sea zones, Siberian rivers and Lake Bikal were infectd. Bychowsky further pointed out that heavily infected fish with this parasite become emaciated and slow in growth. and often die. As this parasite infected on the peri-branchial area. the infected fish showed a severe disturbance of respiration. Urawa et ai.(1980) studied on the development of Neoergasilus japonicus. an Ergasilidae, which infects Japanese freshwater fish. In Korea, Chun(1985) reported the identification of Ergasilus sieboldi from imported carp. and Neoergasilus and Pseudogasilus japonicus from bluegills. respectively. Chun also identified Pseudoergasilus zacconis in cultured ayu(Plecoglossus altivelis). However. this report deals with the detection of Ergasilus sieboldi from cultured catfish(Silurus asotus) for the first time in Korea.