한국 거문도 인근해역의 민새우, Parapenaeopsis tenella의 개체군 동태
Population Dynamics of Smoothshell Shrimp, Parapenaeopsis tenella from the coastal Area of Geomum-do, Korea
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초록
우리나라의 서해와 남해 연안에 분포하는 민새우는 서해 북쪽으로 영광에서 남쪽으로 거제도까지 널리 분포한다. 거문도 인근해역에서 채집된 민새우의 암ㆍ수 성비는 암컷이 48.6%로 나타났고, 이 개체군은 7월과 8월에 성숙하고, 년 1회 신생 가입군이 발생되었다. 교미한 개체는 7월과 8월에 출현하기 시작하였고, 갑각장 13 mm 이상의전 출현 암컷의 50% 이상이 교미한 것으로 나타났고, 성숙도지수는 7-8월에 최고치를 나타내었다. 암컷의 최소 성숙개체는 갑각장 11 mm 이고, 성숙과 교미율에 의한 군성숙도(CL50)는 각각 갑각장 12.53 mm와 12.28 mm로 나타났다. 체장 빈도 자료에 의해 추정된 민새우의 수명은 암컷이 14-15개월로 나타났다. 변형된 von Bertalanffy 성장식에 의해 추정된 성장계수(K)는 암ㆍ수 각각 1.22/년과 2.00/년이고 최대 갑각장(L∞은 암ㆍ수 각각 21.99 mm와 15.00 mm이였으며, 암컷이 수컷보다 성장이 빠르고, 큰 것으로 나타났다.
Abstract
Parapenaeopsis tenella occurs widely on the south and west coasts of korea. Sex ratio showed seasonal variations, with a mean value of 48.6% for the females. The species produces on cohort a year, with the ovaries ripening from July to August. Insemination took place from July to August, as more than half of the females sampled in the study over 14 m CL were inseminated. Gonadosomatic index (GSI) reached the maximum between July and August. The smallest mature female was 11 mm CL. Size at 50% sexual maturity (CL50) determined from both mature females and inseminated females, was 12.53 mm and 12.28 mm CL, respectively. The life span of females appeared to be 14-15 months according to size frequency distributions, while that of the male was 13-14 months. Population growth was estimated by the modified von Bertalanffy growth function incorporating seasonal variation in growth. Based on the growth parameters (K=1.22 yr-1 and L∞ = 21.99 m CL for females, and K = 2.00 yr-1 and L∞ = 15.00 mm CL for males) growth curves showed that females grew faster and reached a larger size at age than males.
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