• Korean Journal of Ecology and Environment
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• v.42 no.3
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• pp.394-403
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• 2009

The fish fauna and community structures were investigated at 15 stations in the midupper region of the Seomjin River watershed from August in 2008 to April in 2009. During the studying period, 42 species belonging to 11 families were collected. Dominant family in the all sites was Cyprinidae (28 species, relative abundance: 66.7%) during the study. Total of 42 species (primary freshwater: 40 species, peripheral freshwater: 2 species) were found with the primary freshwater fishes being the highest. Dominant species was Zacco platypus (22.3%), and subdominant species was Coreoferea herzi (10.8%). Also, Pseudogobio esocinus (9.0%) and Carassius auratus (5.8%) were numerous. There were 17 Korean endemic species (40.5%), including Rhodeus ocellatus, Acheilgnathus koreensis, A. somjinensis, Coreoleuciscus splendidus and Sarcocheillichthys variegatus wakiyae. Among them, Acheilgnathus somjinensis was identified for designation required to protect under a wildlife category. In conclusion, we could define that the Seomjin River watershed has a very good water conditions as habitat of fish.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.2 no.1
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• pp.47-62
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• 1969

A goby, Synechogobius hasta (Temminck et Schlegel) was studied to investigate the food consumed and the biological change of the food organisms, and the fish were sampled from the closed tributary and the lower Part of the Naktong River, near Pusan, during the period from November of 1967 to December of 1968. The fish were sampled from four stations (Fig. 1), the total number of fish being 1,295 and they were grouped and analysed monthly. The content of the alimentary canal was analysed in three categories according to modified Nilsson's method (Dahl 1962) with a slight alteration: 1) The number of each item of stomach contents was counted and the percentage of each item in proportion to the total number of food organisms is indicated by the letter 'N' representing numerical percentage in Table 2. 2) The percentage of fish which contained any items of food organisms in proportion to the total number of fish caught in a given season is indicated by the letter 'O' representing frequency of occurrence. 3) Dominant groups of food items were selected and the percentage of the number of each dominant item in proportion to the number of the food organisms belonging to the dominant groups is indicated by the letter 'D' representing dominance. All food organisms were classified in 50 food item categories and then they were grouped in 13 main groups (Fig. 2-1), and they were further divided into 1) obligatory bottom animals, 2) organic drifts and 3) actively swimming forms; according to the conditions of the animal communities within the habitat. Since the majority of its food was composed of the obligatory bottom animals ($94.6\%$), the fish appeard to be a typical bottom feeder. And the dominant food organisms of the fish is generally determined by the local composition of the benthic fauna within the fish habitat. And their seasonal rhythm occurs among the food organisms in the stomach by the biological interaction. Locality variation in the population of the same food organism occurs due to the difference of food organisms in the habitat of the fish at Seonam and Garak, and at Seongsan and Hadan the condition of the niche for the fish in the both regions seems to be the same since the composition and the seasonal variation of the organisms were the same. The results may be summarized as follows: 1) The goby mainly feed on the animals of bottom fauna, and the food organisms are deter-mined by the food compositions within the habitat. 2) Seasonal variation of the stomach content shows the seasonal rhythm due to the biological variation of the population and their interaction. 3) The goby shows no preference on specific food, and the food is composed of a variety of animals. 4) Major food items of the goby are Polychaeta, Palaemon modestus, Isopoda, Gammaridea, Insecta (nymphs and larvae), Ilyoplax deschampsi, and Paratye compressa. 5) Logitudinal succession oil the population of the food organisms is apparently recognized within the community of Seongsan, Garak and Seonam. 6) The goby begins to descend toward the estuary and sea around April when the water temperature reaches $20^{\circ}C$, and they begin to return to river waters in September.

• Journal of fish pathology
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• v.8 no.1
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• pp.1-11
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• 1995

Two species of the parasitic copepods, Nothobomolochus thambus (Poecilostomatoida, Bomolochidae) and Mitrapus heteropodus (Siphonostomatoida, Lernanthropidae), were recovered on the gills of a marine fish, Konosirus punctatus (Temminck and Schlegel) taken from Kamak Bay in Korea. N. thambus is very distinguishable in the armature of maxilliped from all other species of Nothobomolochus; one of the two strong, hairy setae has become naked. M. heteropodus is very distinguishable in the armature of leg 4; the inner process (endopod) is only about one - fifth the length of the outer process (exopod), Both parasitic copepod species are new to the Korean fauna.

• Journal of Environmental Health Sciences
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• v.44 no.6
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• pp.581-590
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• 2018

Objectives: We aimed to investigate the species composition of fish and benthic macroinvertebrates in the Namgang Dam reservoir and assess the reservoir's ecological quality. Methods: Fish and benthic macroinvertebrates were seasonally sampled around the Namgang Dam reservoir from October 2013 to September 2014. Results: A total of 970 fish specimens were collected for this survey, including 4 orders, 14 families, and 25 species. Fourteen endemic species were observed, including Coreoleuciscus splendidus. The most observed among the endemic species caught was Zacco koreanus (14.4%). A total of 9,093 benthic macroinvertebrates, including 51 families and 92 species, were also found. The predominant species in the study area was Chironomidae sp. 1. Diplonychus esakii, whose habitat is distribution-specific as designated by the Korean National Institute of Environmental Research (NIER), were also observed. A total of 386 specimens were collected of the invasive alien species Lepomis macrochirus, and the percentage of Lepomis macrochirus and Micropterus salmoides made up 42.0% of all specimens collected in the area. Conclusion: The mean ecological score of the benthic macroinvertebrate community (ESB) ranged between 24 and 40, which indicates that the environmental condition of the target sites is somewhat poor. Based on the results of this research, building habitats for benthic macroinvertebrates should be considered, and extermination plans for invasive alien fish species should be prepared.

• Animal Systematics, Evolution and Diversity
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• v.38 no.4
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• pp.271-273
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• 2022

Parabrachiella trichiuri (Yamaguti, 1939), a copepod parasitic on the ribbonfish Trichiurus lepturus (Linnaeus, 1758), is recorded as a new record of Korean fauna. The copepod is the only known species of the family Lernaeopodidae parasitic on T. lepturus. Parabrachiella trichiuri can be differentiated from its congeners by a combination of characters: the trunk is pyriform, with two pairs of processes, the maxilla is less than half as long as the cephalothorax, and the genital process is not protruding from the margin of the trunk. This species had been assigned to different genera, such as Clavellopsis Wilson, 1915, Isobranchia Heegaard, 1947, and Neobrachiella Kabata, 1979.

• Journal of Environmental Science International
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• v.23 no.8
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• pp.1513-1522
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• 2014

Fish passage asssessments were conducted in the fishway at Juksan Weir, which was constructed as a four-major rivers project in the downstream area of Youngsan-River Watershed. For the research, fish-movements/migrations were analyzed for seven times from April ~ October, 2013 using an approach of fish trap-setting. Fish fauna and compositions were analyzed in the fishway, and seasonal- and diel-movement patterns were analyzed in relation to current velocity in the fishway. Also, abundances of exotic fishes such as bluegill sunfish (Lepomis macrochirus), large-mouth bass (Micropterus salmoides), and white curcian carp (Carassius cuvieri) were monitored in the fishway. Current velocity(n = 18) in the fishway showed large variations ($0.82{\pm}0.63m/s$) depending on the location of the fish trap-setting and this physical factor influenced the fish movements. Fish movements, based on the CPUE of individuals, in the fishway was greater in slower velocity (mean: 0.36 m/s, range: 0.10~1.54 m/s) than faster velocity (mean: 1.51 m/s, range: 0.90~1.90 m/s). Seasonal analysis of fish movements showed that most frequent uses (8 speices and 591 individuals, 66.2% of the total) of the fishway occurred in spring period(i.e., June). Diel movement analysis, in the mean time, showed highest in the time period of 00:00 ~ 3:00 am (7 species and 281 individuals, 20.9% of the total). The efficient managements in the fishway at Juksan Weir are required in relation to the hydrological regime.

• Korean Journal of Ichthyology
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• v.17 no.1
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• pp.73-83
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• 2005

The fish fauna and the dynamics of fish community structure in Lake Uiam, Korea, were investigated from July 2003 to May 2004. During the surveyed period, 41 species belonging to 13 families were collected. There were 11 Korean endemic species (26.8%), including Rhodeusuyekii, Acheilognathus yamatsutae, Sarcocheilichthys nigripinis morii, Squalidus gracilis majimae, Squalidus japonicus coreanus, Microphysogobio yaluensis, Iksookimia koreensis, Koreocobitis rotundicaudata, Silurus microdorsalis, Liobagrus andersoni, and Odontobutis platycephala. Dominant species were Hemibarbus labeo (16.2%), Zacco platypus (13.8%), A. yamatsutae (11.8%), S. gracilis majimae (10.4%), Pungtungia herzi (5.8%), and Hypomesus olidus (4.3%). The biomass of collected fishes were H. labeo (35.9 kg), Cyprinus carpio (22.5 kg), Micropterus salmoides (5.5 kg), Lepomis macrochirus (5.2 kg), Carassius cuvieri (3.3 kg) and Z. platypus (2.4 kg). Of the 9 introduced fishes in Lake Uiam, Cyprinus carpio (Israeli type), Carassius cuvieri, Oncorhynchus mykiss irideus, Lepomis macrochirus, and Micropterus salmoides originated in foreign countries, but Anguilla japonica, Hypomesus olidus, Chaenogobius urotaenius, and Rhinogobius giurinus were introduced from other native river systems.

• Korean Journal of Environment and Ecology
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• v.30 no.3
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• pp.369-375
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• 2016

This survey was conducted during March to April 2014 in the main stream and tributaries of Xe Pian and Xe Namnoy in order to investigate fish fauna in the Bolaven Plateau. Fish belonging to twenty eight species and eight families were collected from the main stream and tributaries of Xe Namnoy and Xe Pian during the survey period. Among them, Devario salmonatus, Poropuntius bolovenensis, Annamia sp., Sewellia elongata, Schistura bolavenensis, Schistura sp.1, Schistura sp.2, Schistura sp.3, Schistura sp.4, and Macronathus sp. were endemic species in the Bolaven Plateau, indicating a high prevalence rate of endemic species (35.7%) in the area. Meanwhile, Kottelat (2000, 2013) has been reported that four species of Poropuntius inhabit the Bolaven Plateau. However, the major morphic characteristics of Poropuntius species found in the Bolaven Plateau were mostly overlapped, except for the shape of their mouth. The young fish of Poropuntius (> 70 mm SL) have only generalized mouth while the of adult fish the shape of their mouth have two phenotype (narrow and broad). Therefore, it is assumed that Poropuntius species in the Bolaven Plateau has trophic polymorphism as the same species exhibits two different mouth shapes.

• Korean Journal of Ecology and Environment
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• v.41 no.3
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• pp.301-310
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• 2008

This study was to analyze characteristics of fish compositions and longitudinal distribution, based on trophic and tolerance guild at 22 sampling sites of Yeongsan River watershed during 2003$\sim$2006, and also to compare before and after the estuary dam construction. The collected fishes, based on catch per unit effort (CPUE), were 44 species in the watershed and dominant fishes were Zacco platypus, Acheilognathus macropeterus, Zacco temminckii and Carassius auratus. According to comparative analysis of fish in the non polluted sites (NPS) vs. polluted sites (PS), the number of species and individuals was lower by 70% in the PS than the NPS, indicating ecological degradations by chemical pollutions or/and habitat modifications. The relative abundance of sensitive and insectivore species decreased as the stream order increases, while tolerant and omnivore species increased with the stream order. In this survey, largemouth bass (Micropterus salmoides), which is a top-carnivore and exotic species, may influence trophic guild system throughout active predations on endemic species, resulting in modifications of ecological functions. The construction of estuary dam on Yeongsan River in 1981 resulted in wider lacustrine zone and desalinated through limitation of seawater input. These physical changes have caused increases of lentic dwelling species and limited fish migrations (i.e., eel). Overall, fish fauna and composition analyses showed that the number of species and individuals in this water body may be reduced due to inputs of pollutants from the watershed, habitat modifications, and increases of exotic species (largemouth bass). For these reasons, effective lake management strategies are required for the ecosystem conservation.

• Korean Journal of Environment and Ecology
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• v.31 no.1
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• pp.72-80
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• 2017

Fish fauna and community structures in freshwater were analyzed in the streams (12 stations) of the Bogil Island from May to September 2015. Total numbers of the sampled species and genus (9 families) were 21 and 17, respectively. Gobiidae was the most dominant taxa, which accounted for 47.6% (10 species) of the total species, and the relative abundance, based on the number of individuals, was 60.4% (1,157 individuals). Subdominant families were three taxa of Cyprinidae (3 species; 500 ind.), Mugilidae (2 species; 168 ind.) and Mugilidae (2 species; 128 ind.). The dominant species, based on the relative abundance, was Rhynchocypris oxycephalus (20.7%) and the subdominant species were Gymnogobius urotaenia (19.5%), Leucopsarion petersii (17.2%) and Chelon haematocheilus (8.5%). These species were composed of upstream-resident fish as well as migratory fishes, so the streams of the Bogil Island had unique characteristics in the fish compositions. Based on all the species sampled, 9 species (42.9%) were primary freshwater fishes, 11 species (52.4%) were peripheral fishes and 1 species (4.8%) was amphidromous fish. Korean endemic species and exotic species were not found in the streams of Bogil Island. According to the analysis of fish community structure, species richness index and species diversity index were highest (1.831, 1.957) in the Site 8 and lowest in the Site 4. In the meantime, the dominance index was highestin the Site 4 (1.00) and lowest in theSite 8 (0.17).