한국어류학회지 (Korean Journal of Ichthyology)

  • 제34권4호
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  • Pages.244-252
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  • 2022
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  • 1225-8598(pISSN)
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  • 2288-3371(eISSN)
한국어류학회 (The Ichthyological Society of Korea)
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낙동강 수계 위천에 서식하는 긴몰개 Squalidus gracilis majimae의 난발생 및 자치어 형태발달

Development of Eggs, Larvae and Juveniles of the Squalidus gracilis majimae from Wicheon Stream, Nakdong-River

  • 박재민 (경상북도 토속어류산업화센터) ;
  • 한경호 (전남대학교 수산과학과)
  • Jae-Min Park (Gyeongsangbuk-Do Native Fishes Business Center) ;
  • Kyeong-Ho Han (Marine Technology Undergraduate, Chonnam National University)
  • 투고 : 2022.11.07
  • 심사 : 2022.12.02
  • 발행 : 2022.12.31
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초록

이 연구는 긴몰개의 난발생과 자치어 형태발달을 관찰하여 초기생활사를 규명하고자 실시하였다. 연구에 사용된 긴몰개는 2021년 6월 경북 의성군에 위치한 낙동강 수계 위천으로 유입되는 지류에서 포획하였다. 인공수정을 위해 호르몬 Ovaprim은 kg당 0.5 mL 농도로 주사하였고, 주사 후 12시간 후에 채란하였다. 성숙란의 크기는 0.80~0.85 mm (0.83±0.01 mm, n=30)였고, 수온 22±1℃에서 부화 소요시간은 62시간 30분에서 69시간이 소요되었다. 부화 직후 자어크기는 전장 2.39~2.53 mm (2.44±0.04 mm, n=30)였고, 부화 후 18일째 후기자어는 전장 8.51~9.84 mm (8.95±0.42 mm, n=30)로 척추 끝부분이 완전히 휘어지면서 후기자어로 이행하였다. 부화 후 22일째 치어는 전장 12.6~13.6 mm (13.0±0.36 mm, n=30)로 지느러미 기조 수는 등지느러미 iii7개, 뒷지느러미 i7개로 정수에 달했다. 긴몰개는 난 및 부화자어 크기는 점몰개와 유사하였고, cupulae는 유연종들 가운데 가장 늦게 소실되었다.

The aim of this study was to investigate the early life history of Squalidus gracilis majimae by observing the development of the eggs and morphology of juvenile fish. Squalidus gracilis majimae used in this study were captured in 2021 June from a tributary flowing into Wicheon, located in Uiseong-gun, Gyeongsangbuk-do. For artificial insemination, ovaprim was injected at 0.5 mL/kg. Egg development occurred 12 h after injection. The size of mature eggs of S. gracilis majimae was 0.80~0.85 mm (0.83±0.01 mm, n=30). Incubation time at 22±1℃ ranged from 62.5 to 69 h. The length of larvae immediately after hatching was 2.39~2.53 mm (2.44±0.04 mm, n=30). On the 18th day after hatching, the larvae had a total length of 8.51~9.84 mm (8.95±0.42 mm, n=30), and the tip of the spine was completely curved. On the 22nd day after hatching, the juvenile fish had a total length of 12.6~13.6 mm (13.0±0.36 mm, n=30), with dorsal fins at iii7 and anal fins at i7. Egg size and hatched larvae size were similar for S. gracilis majimae and S. multimaculatus, and cupulae showed a singularity as it disappeared last among related species.

키워드

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