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

Morphological Development of Eggs, Larvae and Juveniles of the Abbottina springeri (Cypriniformes: Cyprinidae)

  • 박재민 (경상북도 토속어류산업화센터) ;
  • 유동재 (경상북도 토속어류산업화센터) ;
  • 조성장 (보령민물생태관) ;
  • 한경호 (전남대학교 수산과학과)
  • 투고 : 2021.08.16
  • 심사 : 2021.09.10
  • 발행 : 2021.09.30

초록

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.

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.

키워드

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