• Journal of Marine Life Science
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• v.3 no.2
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• pp.87-95
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• 2018

To investigate effects of starvation on physiological changes, stress response, and survival of cobitid loach (Misgurnus anguillicaudatus) exposed to sodium nitrite (NaNO₂), a 4-week experiment was conducted. Fewer fish survived in the starved group than those in the fed group during the experiment. Starvation resulted in growth retardation, leading to differences in body length and body depth between fed and starved groups. The fed gorup continued to grow and remained in good condition. Blood chemical analysis (plasma cortisol and glucose) showed significant differences in stress response to nitrite exposure between fed and starved groups (p < 0.05). These results suggest that all parameters employed in this study to assess effects of starvation with NaNO₂ stress are useful information for researching nutritional status in cobitid loach.

• Animal Systematics, Evolution and Diversity
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• v.3 no.1
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• pp.57-62
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• 1987

잔라북도 부안군의 백천에 서식하는 기름종개속 어류의 표본을 조사한바, 종검색의 기준이 되는 수컷 가슴지느러미 기부에 출현하는 골질반은 참종개 Cogbitis koreensis 와 비슷하지만, 조골수역의 기름종개 속 모든 표본은 체측반문의 모양이 특이하고, 척추골수가 37-40개로 적으며 체장범위가 85m 이하인 소형인 점이 참종개와는 잘 구별되어 신아종 C.koreensis pumilus n. subsp.(부안종개, 신칭)로 명명 기재한다.

• The Korean Journal of Zoology
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• v.19 no.4
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• pp.171-178
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• 1976

A new species of Cobitid fish, Cobitis longicorpus is described, based upon many specimens from several tributaries of the Seomjin River situated in the south western part in Korea. Cobitis longicorpus was previously reported as the crossband type of C. taenia by all ichthyologists in Korea. This is distributed in the Seomjin River and characterized by the distinctive cross-band color pattern, the black spots at the back of its opercula, and the structure of lamina circularis in male.

• Proceedings of the Zoological Society Korea Conference
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• 1996.10a
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• pp.62.1-62
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• 1996

No Abstract, See Full Text

• Korean Journal of Ichthyology
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• v.2 no.2
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• pp.203-210
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• 1990

The cobitid hybrid complex of C. sinensis and C. longicorpus occurs commonly in the upper streams of the Nakdong River, Korea where it is sympatric with the bisexual species, C. sinensis and C. longicorpus.The specimens of hybrid complex which are all females accounted for approximately 40% of all cobitid fish observed. These cobitid complex having the unique cloudy specks on body sides appeared to be morphologically intermediate between C. sinesis and C. longicorpusus. The chromosomes of hybrid complex were composed of both diploid form of 49 and triploid form of 73. This forms are tentatively presumed to be a unisexual complex originating from hybrid between C. sinensis and C. longcorpus.

• Proceedings of the Zoological Society Korea Conference
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• 1996.10a
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• pp.62.2-62
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• 1996

No Abstract, See Full Text

• Journal of Species Research
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• v.9 no.4
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• pp.325-338
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• 2020

The animal gut is filled with highly diverse microbes associated with host metabolism, physiology, and pathology. However, numerous animal gut microbes have not been cultured or reported. We isolated various bacterial species using culture-dependent approaches during a comprehensive investigation of endangered endemic vertebrate species in the Republic of Korea. A total of 18 unrecorded bacterial species were isolated from the feces of an Oriental stork (Ciconia boyciana), and from the intestinal tracts of a cobitid fish (Kichulchoia multifasciata) and a Korean splendid dace (Coreoleuciscus splendidus). Based on a phylogenetic analysis of 16S rRNA gene sequences, we discovered species belonging to the phyla Actinobacteria (eight species), Firmicutes (seven species), Proteobacteria (two species), and Bacteroidetes (one species). Based on their high 16S rRNA gene sequence similarities (>98.7%) and formation of monophyletic clades with type species, each species was classified into an independent and predefined bacterial species. Gram-stain reaction, colony and cell morphology, basic biochemical characteristics, isolation source, and NIBR IDs for each species are described in the species description section.

• The Korean Journal of Ecology
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• v.6 no.4
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• pp.10-20
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• 1983

Morphological and ecological comparions are made between specimens of Cobitis koreensis KIM and the geographically restricted population of the Cobitid fish which is found along the Begchon stream, Puangun, Cholla-bugdo province over a 12-month period of 1982 and 1983. The Begchon population is tentatively identified as Cobitis koreensis, but the color patterns and two morphometric proportions differ widely fromthose reported previously for this species. In addition to these character, it is easily distinguished from C. koreensis by the smaller body size, by having the larger egg size and the less egg number in female during the breeding season. As the differentiation of this population is primarily due to geographically isolation, it is supposed that Begchon cobitid population may be an undescribed distinct subspecies of K. koreensis or above the conventional subspecies level.

• Animal Systematics, Evolution and Diversity
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• v.4 no.2
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• pp.91-102
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• 1988

Both Cobitis lutheri Rendahl and C.striata Ikeda previously regarded as the subspecies of C.taenia are revised here and raised to the species rank based on the distinct color pattern on their body sides in relation to the shpae of lamina circularis and suborbital spine, and distinct distributional patter. C. lutheri was similar to C. striata in chromosome number and karyotype, but chromosomal polymorphism as Robert sonian event was confirmed only in the population of C.lutheri studies. Both, C. kutheri and C..striata have disjunct ranges : the former in western Korea and east-northern China Mainland, the latter in the Smjin River of korea and west-southern Japan. hybridization between C. lutheri and C. striata by secondary contact appeared in the limited zone of the Dongjin River, Chllabuk-do province, korea, but the evidence for habitat segregation between them suggests the possibility that natural hybridization occurs between the two species and introgression results. We consider that the two species were produced as ecological equivalent species in the different branch stream of the Paleo-Hwangho River , The time of recession of sea level during the gracial period.

• The Korean Journal of Ecology
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• v.2 no.1
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• pp.9-14
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• 1978

The study was made to expand the knowledge of the ecology of Cobitis koreensis which is very common in the upper and middle part of rivers in western part of Korea. A number of C. koreensis are found in the creek of Jeonju-cheon located at Segjang-ri, Wanju-gun, Jeonrabug-do Province. The area studied has pebble bottoms. The flow velocity of the river ranges from 20cm to 40cm per second under normal conditions. The sex ratio of male to female was 1:1.34 and the female was 10~25mm larger than the male in total length. Length-frequencies in this population indicate that 20~40 mm fish group is underyearling, 40~60mm is a yearling, and 60~85mm is two-year-old. And the fish longer than 90mm in total length is regarded as being over three-year-old. Based on the ratio of gonadal weight to body weight, spawning in this species began in April and expanded well into June with water temperature 20~26。C, and the individuals became sexually mature over the two-year-old. The number of the eggs was counted from ten matured female fishes. The mean number of eggs in seven 72.6~81.4mm fishes was 908 (595-1, 229) and that of the rest three 86.0~89.0mm was 1, 674 (1, 337-2, 023). The contents of stomach in the other fifteen specimens captured in September 1977 were investigated. While the younger fed almost on the algae, the foods in the adult were largely aquatic insects.