Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Morphological Development of Eggs, Larvae and Juveniles of the Abbottina springeri (Cypriniformes: Cyprinidae)

왜매치, Abbottina springeri(Cypriniformes: Cyprinidae)의 난발생 및 자치어 형태발달

  • 박재민 (경상북도 토속어류산업화센터) ;
  • 유동재 (경상북도 토속어류산업화센터) ;
  • 조성장 (보령민물생태관) ;
  • 한경호 (전남대학교 수산과학과)
  • Received : 2021.08.16
  • Accepted : 2021.09.10
  • Published : 2021.09.30
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Abstract

This study was carried out to clarify the egg, larvae and juveniles development of Abbottina springeri. For the experiments, the matured adults were collected at the Seowon-cheon, Dangjin-si, Chungcheongnam-do, in Korea. The amount of spawning of female A. springeri was about 1,225~2,100 (1,662±437, n=10). The fertilized eggs were circular in shape and 1.05~1.13 (1.08±0.02, n=30) mm in diameter. The hatching time was required 72 hours to 80 hours after fertilization under water temperature of 22℃. The newly hatched larvae were 2.10~2.23 (2.16±0.04, n=10) mm in total length and had egg yolk in the abdomen but the mouth was not opened. At 5 days after hatching, the preflexion larvae were 3.19~3.30 (3.24±0.03, n=10) mm in total length and the most of yolk-sac was absorbed. At the 15 days after hatching, the flexion larvae were 4.97~5.30 (5.13±0.12, n=10) mm in total length and the tip of the caudal fin was began to bend upward. At the 25 days after hatching, the postflexion larvae were 8.97~9.60 (9.44±0.16, n=10) mm in total length and the tip of the caudal fin was bent at 45°. At the 35 days after hatching, the juvenile were 12.0~13.5 (12.7±0.53, n=10) mm in total length and all fin-rays (iii7 dorsal fin, iii6 anal fin, i7 ventral fins) were reached a constant number of each part.

본 연구는 왜매치의 초기생활사를 밝히기 위해 충청남도 당진시 서원천에서 성어를 채집하여 인공수정을 통해 수행하였다. 왜매치 암컷의 산란량은 1,225~2,100개(1,662±437개, n=10) 정도였다. 난의 형태는 원형으로 크기는 1.05~1.13(1.08±0.02, n=30) mm였다. 수정란은 수온 22℃에서 부화까지 72~80시간이 소요되었다. 부화 직후의 난황자어는 전장 2.10~2.23 (2.16±0.04, n =10) mm로 입과 항문은 열려 있지 않았고 난황을 가지고 있었다. 부화 후 5일째는 전장 3.29~3.45 (3.36±0.04, n=10) mm로 난황을 모두 흡수하였고 먹이를 섭취하면서 전기자어로 이행하였다. 부화 후 15일째는 전장 4.97~5.30 (5.13±0.12, n=10) mm로 척추 끝부분이 상단으로 휘어지기 시작하면서 중기자어로 이행하였다. 부화 후 25일째는 전장 8.97~9.60 (9.44±0.16, n=10) mm로 꼬리지느러미 말단 끝부분이 45°로 완전히 휘어지면서 후기자어로 이행하였다. 부화 후 35일째는 전장 12.0~13.5 (12.7±0.53, n=10) mm로 각 부위별 지느러미 기조 수(등지느러미 iii 7개, 뒷지느러미 iii 6개, 배지느러미 i 7개)가 정수로 도달하면서 치어기로 이행하였다.

Keywords

References

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