한국어류학회지 (Korean Journal of Ichthyology)

  • 제17권3호
  • /
  • Pages.195-204
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  • 2005
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  • 1225-8598(pISSN)
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  • 2288-3371(eISSN)
한국어류학회 (The Ichthyological Society of Korea)
권호 표지

밀어, Rhinogobius brunneus (Pisces: Gobiidae)의 개체군생태

Population Ecology of the Common Freshwater Goby Rhinogobius brunneus (Pisces: Cyprinidae) in Korea

  • 송호복 (강원대학교 자연과학대학 생명과학부) ;
  • 백현민 (강원대학교 자연과학대학 생명과학부)
  • Song, Ho-Bok (Division of Life Sciences, College of Natural Sciences, Kangwon National University) ;
  • Baek, Hyun-Min (Division of Life Sciences, College of Natural Sciences, Kangwon National University)
  • 투고 : 2005.07.23
  • 심사 : 2005.09.05
  • 발행 : 2005.09.30
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초록

밀어의 개체군생태 연구를 위하여 2003년 5월부터 2005년 6월까지 북한강수계에서 조사, 연구한 결과는 다음과 같다. 조사 하천 중 밀어의 밀도가 가장 높은 주된 서식지는 호수 유입부와 인접한 하천의 하류부였으며 돌과 자갈이 많은 여울지역에서 다수 채집되었다. 주된 동서어류는 피라미, 갈겨니, 돌마자, 참종개 등이었다. 암, 수컷 모두 만 1년이면 성적으로 성숙하는 것으로 나타났으며, 산란시기는 5-6월 (수온 $22{\sim}25^{\circ}C$), 산란성기는 5월 20일경부터 6월 10일경으로 판단되었고, 평균 포란수는 $989{\pm}511$ (151~2,209)개였다. 성비는 1 : 0.90 (♀:♂)으로 근소하게 암컷이 우세하였다. 연령은 전장 약 40 mm 이하군은 만 1년생, 40~52mm군은 만 2년생, 52~65mm군은 만 3년생 그리고 65 mm 이상군은 만 4년생으로 추정되었으며, 암, 수간 성장의 차이는 없었다. 산란소는, 수심 평균 $13.7{\pm}5.8$ (5~31) cm (N = 80), 유속 평균 $9.6{\pm}4.8$ (10~19) cm/sec (N = 35)의 장소에 형성하였으며, 알을 보호하고 있는 수컷의 보유 난수는 평균 $1,974{\pm}1810$개였다 (egg number = $95.022_{TL}-3507$ ($r^2=0.3591$, N = 33). 유하한 부화자어는 6월말부터 8월까지 소상하였으며 이 때 최소형의 전장은 대부분 20 mm 이상이었다.

The population ecology of Rhinogobius brunneus was investigated on, tributaries of the Bukhan River from May 2003 to June 2005. The habitat was mostly a rapids area with pebbles and cobles in the lower part of the stream. The cohabitation fishes were Zacco platypus, Zacco temmincki, Microphysogobio yaluensis and Iksookimia koreensis. The males and females become sexually mature after one year. Spawning season was from May to June with water temperatures in the range $22{\sim}25^{\circ}C$. The prosperous period was from late May to early June. The average number of eggs in the ovary was $989{\pm}511$ (range, 151~2,209). The year-round sex ratio of female to male was 1 : 0.90. The total length in this population indicated that the below-40 mm group is one year old, 40~52 mm group is two years old, 52~65 mm group is three years old, and the longer-than-65 mm group is over four years old. There were no differences in total length distribution between the males and females. Nests were built up at a water depth of $13.7{\pm}5.8$ (5~31) cm and a current velocity of $9.6{\pm}4.8$ (10~19) cm/sec. Brood size (egg number) of the parental male was $1,974{\pm}1810$ (egg number = $95.022_{TL}-3507$, $r^2=0.3591$, N = 33). Newly hatched larvae that drifted downstream to the lake returned to the stream during late June to August; the smallest size in this population was 20 mm in total length.

키워드

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