Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Egg Development and Early Life History of the Anadromous Fish Tribolodon hakonensis in the Seomjin River, Korea

섬진강에서 채집한 황어(Tribolodon hakonensis)의 난 발생 및 초기생활사 연구

  • 최성국 (국립수산과학원 중앙내수면연구소) ;
  • 이완옥 (순천향대학교 생명과학과) ;
  • 홍양기 (국립중앙과학관) ;
  • 송미영 (국립수산과학원 중앙내수면연구소)
  • Received : 2021.11.15
  • Accepted : 2021.12.09
  • Published : 2021.12.31
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Abstract

The egg development and early life history of Tribolodon hakonensis that collected from the Seomjin River were studied. The fertilized eggs of the T. hakonensis were slightly adhesive and separated with a yellow yolk and no oil globule. The size of the eggs was an average of 2.89 mm (2.79~2.96) in diameter. Fifty percents of the embryos were hatched in about 63 hrs after fertilization at water temperature of 20℃. The newly hatched larvae showed average 6.92 mm (6.09~7.60) in total length. At 8 days after hatching, they were 13.75±0.67 mm (n=10) in total length and their yolk sacs were completely absorbed, opening mouth and anus (postflexion larvae stage). At 40 days after hatching, they became juvenile and reached 26.99±1.82 mm (n=10) in total length and all their fin rays were formed. At 137 days after hatching, the young fish were 72.63±10.7 mm (n=10) in total length and their body shape, color and behavior were similar to those of adult fish. The size of eggs and the larva after hatching significantly affected the initial growth among groups of genus Tribolodon, and the hatching time of fertilized eggs and the growth rate of the early life history according to the water temperate were different.

섬진강에서 채집한 황어 Tribolodon hakonensis의 난 발생과 초기생활사를 연구하였다. 건식법으로 수정한 수정란은 평균 2.89 mm (2.79~2.96)이고, 난황이 황색이며, 약한 점착성을 가지는 구형의 침성란이었다. 부화 50%를 기준으로 수온 20℃에서 63시간에 부화가 완성되었으며, 자어의 크기는 6.92 mm (6.09~7.60)이었다. 부화 8일 후 전장 13.75±0.67 mm (n=10)로 성장하고, 난황이 완전히 흡수되고 입과 항문이 열린 후기 자어기에 도달하였다. 부화 40일 후에는 전장 26.99±1.82 mm (n=10)로 성장하였고, 모든 지느러미는 분리되고, 기조수가 완성되어 치어기에 도달하였다. 부화 137일 후에는 72.63±10.7 mm (n=10)로 성장하였으며, 체형, 색 그리고 행동이 성어와 유사하였다. 황어속 어류들의 종 및 집단 간 알의 크기, 부화 직후 자어의 크기가 초기성장에 많은 영향을 주었고, 수온에 따른 수정란의 부화 시간과 자어의 성장속도에 차이가 나타났다.

Keywords

Acknowledgement

국립수산과학원 수산시험연구사업(R2021036) 지원으로 수행된 연구입니다. 현장조사 및 사육에 도움을 주신 분들과 세심하게 검토해 주신 세 분의 심사위원께 감사드립니다.

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