Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Life History of the Endangered Endemic Species, Rhynchocypris semotilus (Pisces: Cyprinidae) in the Songhyeoncheon (Stream), Korea

송현천에 서식하는 멸종위기어류 버들가지 Rhynchocypris semotilus (Pisces: Cyprinidae)의 생활사

  • Received : 2023.08.01
  • Accepted : 2023.08.23
  • Published : 2023.08.31
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Abstract

Life history of the endangered endemic species, Rhynchocypris semotilus, was investigated to obtain baseline data for its ecological characteristics in Songhyeoncheon, Hyeonnae-myeon, Goseong-gun, Gangwon-do, Korea from April to October, 2022. A total of 10 families and 18 species of fishes were collected from 4 survey stations, and R. semotilus was a subdominant species in the survey period (seven times). The main habitat of R. semotilus was the middle-upper stream of rock and boulder bottoms with aquatic plants and slow rapids and pools. The age groups for R. semotilus estimated by the frequency distribution of total length in spawning season (May) indicated the 4~12 mm is 0-year old, 32~49 mm is 1-year old, the 50~65 mm group is 2-years old, the 66~91 mm is 3-years old, and the 92~116 mm is more than 4-years old, and showed rapid growth from May to September. Total length range of female and male were the relatively similar, and sex ratio (♂/♀) was 0.78. The spawning period is from May to July (water temperature is 17 to 21℃), and gonad was developed more than three years old (more than TL 66 mm). In May, the gonadosomatic index (GSI) was 10.6±2.99% for females and 8.2±2.34% for males, fecundity was 6,830±1,943, and mature eggs size was 1.34±0.16 mm. Finally, life history characteristics of R. semotilus was discussed between the genus Rhynchocypris and Phoxinus species.

멸종위기어류 버들가지 Rhynchocypris semotilus의 생태적 특징을 밝히기 위해 강원도 고성군 현내면의 송현천에서 2022년 4월부터 10월까지 생활사를 조사하였다. 4개 지점을 선정하여 7회 조사한 결과, 동소출현종은 10과 18종이 채집되었으며, 버들가지는 아우점종이었다. 버들가지는 송현천 중·상류의 바위와 큰돌, 수생식물로 이루어진 느린 여울부와 소에 주로 서식하고 있었다. 산란이 시작되는 5월에 전장빈도분포도로 버들가지의 연령을 추정하면, 전장 4~12 mm는 당년생 치어, 32~49 mm는 만 1년생, 50~65 mm는 만 2년생, 66~91 mm는 만 3년생, 92~116 mm는 만 4년생 이상으로 추정되었고, 5월부터 9월까지 급격한 성장을 보였다. 암컷과 수컷의 전장은 비교적 유사하였고, 암·수 성비(♂/♀)는 0.78이었다. 산란기는 5월부터 7월이며(수온은 17~21℃), 생식소는 전장 66 mm 이상인 만 3년생부터 성숙하였다. 5월의 생식소성숙도(GSI)는 평균 암컷 10.6±2.99%, 수컷 8.2±2.34%였고, 포란수는 평균 6,830±1,943개, 성숙란의 크기는 1.34±0.16 mm였다. 끝으로 버들가지의 생활사 특징을 버들치속과 연준모치속 어류와 비교·논의하였다.

Keywords

Acknowledgement

이 논문은 2022년 DMZ 일원 생태계 조사 (NIE-수탁연구-2022-87)의 일환으로 연구되었습니다.

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