한국환경생태학회지 (Korean Journal of Environment and Ecology)

  • 제34권3호
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  • Pages.216-223
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  • 2020
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  • 1229-3857(pISSN)
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  • 2288-131X(eISSN)
한국환경생태학회 (Korean Society of Environment and Ecology)
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자호천에 서식하는 꺽지(Coreoperca herzi)의 생태 특징

Ecological Characteristics of Korean Aucha Perch, Coreoperca herzi in Jaho Stream, Korea

  • 투고 : 2020.04.28
  • 심사 : 2020.06.03
  • 발행 : 2020.06.30
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초록

꺽지(Coreoperca herzi)의 생태적 특징을 연구하기 위해 2018년 9월부터 2019년 8월까지 자호천에서 조사를 실시하였다. 본 종은 하천 중류역에 분포하며 하상구조는 작은돌(cobble)과 조약돌(pebble)이 풍부한 여울이었으며, 수심은 32~157 cm 이었고, 유속은 0.64±0.28 (0.32~1.28) m/sec로 빨랐다. 암수 성비는 1 : 0.93 이었고, 전장빈도분포도에 따른 연령은 전장 42~80 mm가 만1년생, 80~130 mm은 만 2년생, 130~200 mm가 만 3년생, 200 mm 이상이 만 4년생 이상으로 추정되었다. 생식가능 전장의 크기는 암컷이 65 mm, 수컷은 70 mm 이상으로 나타나 실험실에서 사육한 개체 보다 자연에서 성장한 개체의 전장이 작았다. 산란시기는 5월에 시작하여 7월 말에 끝났으며(수온은 18.4~26.4℃) 성란 성기는 5~6월로 추정되었다(수온은 18.4~21.8℃). 포란수는 평균 462 (151~919)개 이었고 성숙란은 짙은 노란색 구형으로 직경이 2.31±0.33(1.94~3.10) mm 이었다. 전장-체중과의 상관관계식은 BW = 0.00002TL3.01로 상수 a는 0.00002를, 매개변수 b는 3.01 이었고 비만도 지수는 평균 K=1.76 (1.01~2.63) 이었고 기울기(Slope)는 0.0005로 양의 값을 나타내었다.

This study investigated the ecological characteristics of Coreoperca herzi at Jaho stream from September 2018 to August 2019. This species inhabited riffle and midstream of the stream, where the riverbed structure was mostly covered with cobble and pebble. The depth of the habitat was 32-157 cm, and the velocity of stream fast at 0.64±0.28 (0.32-1.28) m/sec. The gender ratio of females to males was 1:0.95. The age according to the frequency analysis of total length indicated that the group with 42-80 mm in total length was one year old, the group with 80-130 mm was two years old, the group with130-200 mm was three years old, and the group over 200 mm was four years old. The total length of sexually mature fishes was 65 mm for females and 70 mm for males. The sexually mature individuals grown in nature had a smaller total length than those reared in a laboratory. The spawning season was from May to late July, and the water temperature was 18.4-26.4℃ during the period. The prosperous spawning season was from May to June, and the water temperature was 18.4-21.8℃ during the period. The average number of eggs in the ovaries was 462 (151-919) per mature female, and the matured eggs were yellowish and spherical with a mean diameter of 2.31±0.33 (1.93-3.10) mm. Calculation length-weight relation of Korean aucha perch showed the constant a as 0.00002 and b as 3.01, condition factor (K) as 1.76 (1.01-2.63) on average, and the slope was a positive value of 0.0005.

키워드

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