Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Life History of the Siberian Stone Loach Orthrias toni (Pisces: Balitoridae) in the Buk Stream, Goseong, Korea

한국자생종 종개 Orthrias toni(Pisces: Balitoridae)의 생활사

  • 고명훈 (이화여자대학교 에코과학부)
  • Received : 2017.08.28
  • Accepted : 2017.09.22
  • Published : 2017.09.30
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Abstract

Life history of the Siberian stone loach, Orthrias toni, were investigated using samples collected from Buk Stream, Goseong-gun, Gangwon-do, Korea. Growth was rapid between April and October when water temperature exceeded $10^{\circ}C$, but growth almost stopped from November-March when water temperature was below $10^{\circ}C$. Age groups for O. toni estimated by frequency distribution of total length in spawning season (May) indicated the 60~81 mm is 1-year old, the 82~99 mm group is 2-years old, the 100~119 mm is 3-years old, and the 120~140 mm is more than 4-years old. Total length range by sex was similar, and sex ratio (♂/♀) was 0.73. Spawning season according to the gonadosomatic index (GSI) was May with water temperature $14{\sim}17^{\circ}C$, and almost all fish were mature after one year old. Fecundity increased rapidly with age with an average of $4,460{\pm}3,302$ ($mean{\pm}SD$). Size of mature eggs was $0.87{\pm}0.03mm$ in diameter irrespective of age.

강원도 고성군 북천에서 종개 Orthrias toni의 생활사를 조사하여 생물학적 특징을 밝혔다. 성장은 수온이 $10^{\circ}C$ 이상 되는 4월부터 10월까지 빨랐으나 수온이 $10^{\circ}C$ 이하인 11월부터 이듬해 3월까지는 거의 멈추었다. 연령은 전장빈도분포도로 볼 때 산란기인 5월을 기준으로 전장 60~81 mm는 만 1년생, 82~99 mm는 만 2년생, 100~119 mm는 만 3년생, 120~140 mm는 만 4년생 이상으로 추정되었다. 암컷과 수컷의 연령별 전장 범위는 거의 동일하였고, 성비(♂/♀)는 0.73으로 암컷이 많았다. 산란기는 생식소성숙도(GSI)로 추정한 결과 5월이었으며, 이때의 수온은 $14{\sim}17^{\circ}C$였다. 생식소는 모든 연령이 성숙하였고, 연령이 높아지면서 포란수는 급격히 증가하였으며, 평균 $4,460{\pm}3,302$개였다. 성숙란의 크기는 연령과 상관없이 직경 $0.87{\pm}0.03mm$로 비슷하였다.

Keywords

References

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