Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Reproductive Ecology and Spawning Behavior of the Natural Monumental and Endangered Species, Cobitis choii (Pisces: Cobitidae) in Geumgang (River), Korea

천연기념물이며 멸종위기종인 미호종개 Cobitis choii (Pisces: Cobitidae)의 번식생태 및 산란행동

  • Myeong-Hun Ko (Kosoo Ecology Institute) ;
  • Il-Ro Lee (Department of Life Science and Biotechnology, Soonchunhyang University) ;
  • In-Chul Bang (Department of Life Science and Biotechnology, Soonchunhyang University)
  • 고명훈 (고수생태연구소) ;
  • 이일로 (순천향대학교 생명과학과) ;
  • 방인철 (순천향대학교 생명과학과)
  • Received : 2024.07.11
  • Accepted : 2024.08.12
  • Published : 2024.08.31
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Abstract

A survey was conducted in 2011 to investigate the reproductive ecology and spawning behavior of the natural monumental and endangered species, Cobitis choii. C. choii exhibits sexual dimorphism with the development of lamina circularis on the second pectoral fin ray in males at one year old, facilitating easy differentiation between males and females. A total of 1,288 females and 881 males were collected from January to December, resulting in a sex ratio of 1 : 0.68. The spawning season was estimated to be from late June to early July (spawning peak from late June, with water temperatures ranging from 22 to 25℃), coinciding with a sharp decrease in the condition index. Gonadal maturity was observed with maturity indices of 17.5±2.11% for females and 2.9±0.46% for males, with fecundity of 2,444±838 eggs and egg size of 0.75±0.05 mm. Spawning behavior was induced by hormone injection (Human Chorionic Gonadotropin, HCG) in laboratory conditions. Experimental results revealed that males and females paired in a 1 : 1 ratio before spawning. Males pressed the abdomen of females using their lamina circularis to induce spawning, followed by immediate fertilization. Spawning behavior was repeated 15 to 25 (average 20) times per pair of males and females, and 80 to 120 eggs were spawned per time, and the total amount of spawned eggs were 2,500±250 on average.

천연기년물이며 멸종위기어류인 미호종개의 번식생태 및 산란행동을 밝히기 위해 2011년 조사를 실시하였다. 미호종개는 수컷에 성적 이형인 골질반(lamina circularis)이 만 1년생 때 가슴지느러미 제2기조에 생성되어 암·수가 쉽게 구별되었으며, 1월부터 12월까지 암컷 1,288개체, 수컷 881개체가 채집되어 성비는 1 : 0.68이었다. 산란기는 비만도지수의 급격한 하락을 보인 6월 말부터 7월 초(산란성기 6월말, 수온 22~25℃)로 추정되었고, 생식소성숙도는 암컷 17.5±2.11%, 수컷 2.9±0.46%이며, 포란수는 2,444±838개, 난경은 0.75±0.05 mm였다. 산란행동은 실험실에서 호르몬(HCG)을 주사하여 산란을 유도하여 관찰하였다. 실험결과, 암컷과 수컷은 산란이 임박하면 1 : 1로 짝을 이룬 후 수컷이 가슴지느러미 골질반을 이용하여 암컷의 복부를 압박하여 산란을 유도하고 바로 방정하여 수정시켰다. 산란행동은 암·수 1쌍당 15~25 (평균 20)회를 반복하였고, 1회당 80~120개의 난을 산란하였으며, 총 산란량은 평균 2,500±250개였다.

Keywords

Acknowledgement

본 연구는 환경부 "2011년도 멸종위기 담수어류(퉁사리 등 4종) 증식·복원 연구"의 연구비 및 순천향대학교의 연구비 지원을 받아 수행되었다.

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