Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
권호 표지

Embryonic Development and Early Life History of the Endangered Species Microphysogobio koreensis (Pisces: Cyprinidae)

멸종위기종 모래주사 Microphysogobio koreensis의 난발생 및 초기생활사

  • Kim, Chi-Hong (Central Inland Fisheries Research Institute) ;
  • Yoon, Seung-Woon (Department of Biological Science and Institute for Biodiversity Research, College of Natural Sci-ences, Chonbuk National University) ;
  • Kim, Jae-Goo (Department of Biological Science and Institute for Biodiversity Research, College of Natural Sci-ences, Chonbuk National University) ;
  • Kim, Hyun-Tae (Department of Biological Science and Institute for Biodiversity Research, College of Natural Sci-ences, Chonbuk National University) ;
  • Park, Jong-Sung (Department of Biological Science and Institute for Biodiversity Research, College of Natural Sci-ences, Chonbuk National University) ;
  • Park, Jong-Young (Department of Biological Science and Institute for Biodiversity Research, College of Natural Sci-ences, Chonbuk National University)
  • 김치홍 (국립수산과학원 중앙내수면연구소) ;
  • 윤승운 (전북대학교 자연과학대학 생명과학과.생물다양성연구소) ;
  • 김재구 (전북대학교 자연과학대학 생명과학과.생물다양성연구소) ;
  • 김현태 (전북대학교 자연과학대학 생명과학과.생물다양성연구소) ;
  • 박종성 (전북대학교 자연과학대학 생명과학과.생물다양성연구소) ;
  • 박종영 (전북대학교 자연과학대학 생명과학과.생물다양성연구소)
  • Received : 2012.09.05
  • Accepted : 2012.09.25
  • Published : 2012.09.30
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Abstract

Egg development and early life history of the endangered Korean freshwater fish, Microphysogobio koreensis, was investigated to get a basic information for establishing its conservation strategy. The matured adult fishes were sampled at Imsil-gun, Jeollabuk-do, Korea in May 1 2012 and artificially fertilized. The fertilized eggs were spherical, separated demersal and $1.8{\pm}0.14mm$ in diameter. The hatching of the embryo began at about 29 hours after fertilization under water temperature of $23^{\circ}C$. The newly hatched pre-larvae were average $2.2{\pm}0.48mm$ in total length. At 4 days after hatching, the post-larvae were $3.6{\pm}0.55mm$ in total length and york sac was completely absorbed. At 20 days after hatching, their fin rays were formed and finally the larvae entered juvenile stage and grew up to $6.5{\pm}0.77mm$ in total length. At 60 days after hatching, the total length reached $24.4{\pm}1.71mm$, and the band patterns of he head and lateral side were similar to adult fish. Based on this study, the fertilized eggs of M. koreensis hatched more quickly and the pre-larvae length was also smaller, compared with related species.

멸종위기 담수어인 모래주사의 종 보존을 위한 기초자료를 얻기 위해 난발생 및 초기생활사를 연구하였다. 2012년 5월 1일 전북 임실에서 포획된 성어를 이용하여 인공 수정시켰으며, 수정란은 구형의 분리침성란에 난경은 $1.8{\pm}0.14mm$였다. $23^{\circ}C$의 수온에서 29시간 후에 부화하였으며, 부화 직후 전기자어의 크기는 $2.2{\pm}0.48mm$였다. 부화 후 4일째 난황을 모두 흡수하여 후기자어기에 진입하였으며, 전장은 $3.6{\pm}0.55mm$였다. 20일이 지나자 지느러미 기조수가 정수가 되어 치어기로 이행하였으며, 전장은 $6.5{\pm}0.77mm$였다. 부화 후 60일이 지나자 두부와 체측에 나타나는 반문이 성어와 유사해졌으며, 전장은 $24.4{\pm}1.71mm$에 달하였다. 모래주사의 난발생 과정 및 초기생활사를 모래무지아과 어류들과 비교한 결과 수정란의 부화시간은 비교적 빨랐으며 부화 직후 전기자어의 크기도 작았다.

Keywords

Acknowledgement

Supported by : 국립수산과학원

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