Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Morphological Development of Eggs, Larvae and Juveniles of Siberian Stone Loach, Barbatula nuda (Pisces: Nemacheilidae) in the Sangcheoncheon Stream, a Tributary of Bukhangang River, Korea

북한강 지류 상천천에 서식하는 대륙종개 Barbatula nuda (Pisces: Nemacheilidae)의 난발생 및 자치어 형태 발달

  • 곽영호 (국립수산과학원 중앙내수면연구소) ;
  • 송미영 (국립수산과학원 중앙내수면연구소) ;
  • 송하윤 (국립수산과학원 중앙내수면연구소)
  • Received : 2022.02.28
  • Accepted : 2022.03.21
  • Published : 2022.03.31
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Abstract

We investigated to elucidate the early life history of siberian stone loach, Barbatula nuda (Pisces: Nemacheilidae). Adult fish were collected using net in the Sangcheoncheon Stream, Cheongpyeong-myeon, Gapyeong-gun, Gyeonggi-do, Korea, 26th April 2020. HCG 10 IU/g was injected to female and male fish and fertilized by dry method in the laboratory. The number of eggs of B. nuda was 1,308±293 (TL: 70.64~79.24 mm), and the egg color was yellowish grey. Fertilized eggs measured 1.13±0.01 mm (n=10) in diameter and showed adhesion. The fertilized eggs started hatching after 104 hours. At the time of egg development, the 15℃ group showed an average hatching rate of 80.1±1.2% and the 20℃ group showed 61.5±6.8%, so the 15℃ group was suitable (p<0.05). Newly hatched larva an average were 3.12±0.06 mm (n=10) in total length. At 4 days after hatching, the total length was 4.89±0.09 mm (n=10), and feeding began with the mouth and anus opened, and entered to preflexion larvae stage. At 21 days after hatching, the total length was 10.98±0.40 mm (n=10), and the distal part of the notochord was bent to 45°, and entered to postflexion larvae stage At 26 days after hatching, the total length was 13.47±0.37 mm (n=10), and entered the juvenile stage.

대륙종개의 난발생 및 초기생활사 연구를 위해 2020년 4월 26일 북한강 지류인 상천천에서 대륙종개를 채집하였다. 성숙한 암컷과 수컷의 복강에 HCG 10 IU/g를 주사하였고 15시간 후에 건식법으로 인공수정하였다. 대륙종개 암컷 전장 70.64~79.24 mm (n=3)의 포란수는 1,308±293개였고, 성숙란은 황회색의 침성점착란이었다. 수정란의 난경은 1.13±0.01 mm (n=10)였고 수정 후 104시간 만에 부화하였다. 난발생 시 수온 15℃ 그룹의 부화율은 평균 80.1±1.2%로 나타났고, 수온 20℃ 그룹은 61.5±6.8%로 나타나 발생 수온은 15℃에서 적합하였다 (p<0.05). 부화 직후의 자어는 전장 3.12±0.06 mm (n=10)였으며 몸은 투명하였다. 부화 후 4일에는 전장 4.89±0.09 mm (n=10)로 입과 항문이 열리면서 먹이활동을 시작하였고 난황이 모두 흡수되면서 전기자어기로 이행하였다. 부화 후 14일에는 전장 8.66±0.14 mm (n=10)로 척색말단이 위로 휘어지기 시작해 중기자어기로 이행하였고 부화 후 21일에는 전장 10.98±0.40 mm (n=10)로 척색말단이 45°로 완전히 휘어졌다. 부화 후 26일에는 전장 13.47±0.37 mm (n=10)로 모든 지느러미 기조가 정수가 되어 치어기로 이행하였다.

Keywords

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