Journal of Aquaculture (한국양식학회지)

The Korean Society of Fisheries and Aquatic Science (한국양식학회)
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Population Dynamics and Sexual Maturity of the Mysid Neomysis japonica (Ishikawa and Oshima, 1951) in a Shrimp Farm in Korea

대하 양식장에 서식하는 곤쟁이 Neomysis japonica (Ishikawa and Oshima, 1951)의 개체군 역학과 성 성숙

  • Ma, Chae-Woo (Department of Marine Biotechnology, Soonchunhyang University) ;
  • Lim, Sung-Do (Department of Marine Biotechnology, Soonchunhyang University) ;
  • Park, Won-Gyu (Department of Marine Biotechnology, Soonchunhyang University)
  • 마채우 (순천향대학교 해양생명공학과) ;
  • 임성도 (순천향대학교 해양생명공학과) ;
  • 박원규 (순천향대학교 해양생명공학과)
  • Published : 2009.02.25
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Abstract

Population dynamics and sexual maturity of Neomysis japonica (Ishikawa and Oshima, 1951) were investigated from a shrimp farm in Tae-an, Korea. N. japonica was collected monthly at the shrimp farm belonging to the Marine and Fisheries Research Institute, the Soonchunhyang University from October 2002 to September 2003. The proportion of female was higher than that of male. The mean carapace length of male (2.42 mm) was larger than that of female (2.31 mm). Brood size increased with increasing female body size. The size of N. japonica at 50% sexual maturity was approximately 4.4 mm. N. japonica females grew faster and reached larger size than males. The mortality rate (z) calculated by length-converted catch curves was $3.46\;yr^{-1}$. The annual recruitment pattern of N. japonica had two major peaks. Log-transformed total length was significantly related with log-transformed carapace length.

대하새우 양식장에 서식하는 곤쟁이 Neomysis japonica (Ishikawa and Oshima, 1951)의 개체군 역학과 성 성숙에 관한 전반적인 생물학적 정보를 밝히기 위해 2002년 10월부터 2003년 9월까지 12개월 동안 매월 1회씩 충남 태안군 남면 당암리에 소재한 순천향대학교 해양수산연구소의 대하새우 양식장에서 표본을 채집하였다. 개체군의 특성을 알기 위해 성비, 성 성숙도, 포란수 그리고 성장계수 등을 조사하였다. 암컷이 수컷에 비해 월별 성비가 높았고, 평균 갑각장은 수컷($2.42\;mm{\pm}0.52$)이 암컷($2.31\;mm{\pm}0.48$)보다 높았으나 모두 오차 범위내에서 차이를 보여 갑각장의 크기는 통계학적으로 유의하지는 않았다. 암컷은 성체의 크기가 큰 개체가 많은 난을 포란하였으며, 암컷의 50%가 포란하는 체장은 4.48 mm였다. von Bertalanffy, 성장 매개변수를 바탕으로 한 계절별 성장 속도는 암컷이 수컷보다 빨랐으며, 양식장내에 서식하는 개체군은 일년 중 2회의 가입을 하는 것으로 나타났다. 암컷과 숫컷의 상대성장을 회귀직선 방식으로 비교한 결과수컷의 성장속도가 암컷보다 조금 빨랐다.

Keywords

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