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김익수,이은희 ( Ik Soo Kim,Eun Hee Lee ) 한국하천호수학회 1995 생태와 환경 Vol.28 No.4
During the period from December in 1994 to January in 1995, the Korean endemic Cobitid fish, Niwaella multifasciata collected from the Kyongho River and Dukchon River which are tributaries of the Nakdong River, Sanchong-gun, Kyongsangnam-do, Korea. This report is a description of the gross morphology of the embryos and larvae up to the development of juvenile period of life. The eggs from the females were obtained by injecting gonadotropin and fertilized by dry method in the laboratory. Live, freshly laid eggs of this species were separative, demersal, reddish orange and average 1.8mm in diameter. The eggs began to hatch approximately about 142 hours after artificial fertilization at the water temperature of 10∼14℃. The newly hatched larvae were average 5.4mm in total length possessing yolk sac and 44∼46 myotomes. The hatched larvae showed high mortality and almost all larvae reached the adult stage. 2 days after hatching, the larvae attained average 7.1mm in total length, and were observed the melanophores at the side of the body at this time. 16days after hatchng, the larvae absorbed the yolk completely and became postlarvae. 85days after hatching, the larvae attained 17.3∼19.9mm in total length and entered the juvenile stage. All the fin rays were formed with complete set of fin rays; D.III, 6, A.III, 4, P. 9, V. 6, C.16. 110 days after hatching, the juvenile reached to 21.9∼24.6mm in total length, and the band patterns of them were very similar to those of the adult of Niwaella multifasciata.
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金益秀,李銀姬 全北大學校 1995 論文集 Vol.39 No.-
It was collected 30 specimens of Cobitis sinensis and 11 specimens of C. sinensis-longicorpus complex from the Imchon River, Hamynag-gun, Kyongsangnam-do, Korea in October, 1994. C. sinensis-longicorpus complex were represented by all females and triploid in karyotypes. The chromosome number of the complex have 73 composing 28 meta-submetacentrics and 45 subtelo-telocentric chromosomes. In this paper, we discussed the systematics of C. sinensis-longicorpus triploid population occuring in this area based on their karyotypes and body color patterns.
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