• Title/Summary/Keyword: Cobitidae

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Morphological Development of Egg and Larvae of Koreocobitis naktongensis (Cobitidae) (멸종위기에 처한 얼룩새코미꾸리 Koreocobitis naktongensis (Cobitidae)의 난 발생 및 자치어 형태 발달)

  • Song, Ha-Yoon;Yang, Hyun;Cho, Eun-Mi;Shin, Hyunchur;Bang, In-Chul
    • Korean Journal of Ichthyology
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    • v.21 no.4
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    • pp.247-252
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    • 2009

  • The egg development and early life history of the Korean endangered fish Koreocobitis naktongensis (Cobitidae) were investigated. Eggs from the females were obtained by injecting 10 IU/g of human chorionic gonadotropin and inseminated with sperm by the dry method in the laboratory. The fertilized eggs were 1.0~1.2 mm in diameter and had no oil globules. The embryo began to hatch about 38 hrs after fertilization under water temperature of $20{\pm}1^{\circ}C$. The newly-hatched larvae were 2.6~2.8 mm in total length, and their mouth and anus were not yet opened. Seven days after hatching, the postlarvae were 4.5~5.2 mm in total length, and their yolk sacs were completely absorbed. They entered the juvenile stage when all fin-rays were formed at 50 days after hatching, and their total lengths were 21~27 mm.

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A Review of the Spined Loaches, Family Cobitidae (Cypriniformes) in Korea (한국산 미꾸리과 (잉어목) 어류의 연구)

  • Kim, Ik-Soo
    • Korean Journal of Ichthyology
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    • v.21 no.sup1
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    • pp.7-28
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    • 2009

  • The family Cobitidae of Korea was reviewed as 16 species in 5 genera with the key to species for the identification by the external features. The three genera of Iksookimia, Koreocobitis, and Kichulchoia erected from the genus Cobitis were reclassified based on the presence or absence of Gambetta’s zones on the body sides, their body pigmentation, the shape of lamina circularis in males, the number of unbranched anal fin rays, and some molecular phylogenetic data. By the results of these reexamination, the generic names of the three species were changed as Cobitis choii, Iksookimia pacifica, and Kichulchoia mutifasciata. It was remarked biogeographically that most species of genera Cobitis, Iksookimia, Koreocobitis, and Kichulchoia show the disjunct distributions with bottom-dwelling preferences as endemic to Korean peninsular. Three species of Cobitis choii, Kichulchoia brevifasciata, and Koreocobitis naktongensis are considered to be critically endangered according to the severe habitat destruction and the alteration of river topography.

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Spawning Period and Spawning Characteristics of Kichulchoia multifasciata (Pisces: Cobitidae) in the Yugokcheon (stream) of Nakdonggang (river) from Korea (낙동강 유곡천에 서식하는 수수미꾸리 Kichulchoia multifasciata (Pisces: Cobitidae)의 산란시기와 산란특성)

  • Kim, Hyeong Su;Yang, Hyun
    • Korean Journal of Ichthyology
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    • v.28 no.2
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    • pp.93-99
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    • 2016

  • Spawning period and spawning characteristics of Kichulchoia multifasciata (Pisces: Cobitidae) inhabiting the Yugokcheon (stream) of Nakdonggang (river) were investigated in the area of Segangyo (bridge), Yugok-myeon, Uiryeng-gun, Gyeongsannam-do, Korea from November 2008 to October 2009. The total length of population indicated that 45~55 mm group is one year old, 55~75 mm group is two years old and longer than 75 mm is regarded over three years old in males and 40~55 mm group is one year old, 55~75 mm group is two years old, 75~95 mm group is three years old and longer than 95 mm is considered over four years old in females (January 2009). It has predicted that the spawning period is from May to June (water temperature in the range $21.0{\sim}26.6^{\circ}C$). Sexually matured individuals appeared over the two years old. The number of eggs in the ovaries was 202~747 ($491{\pm}154.0$).

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