Population Dynamics of Smoothshell Shrimp, Parapenaeopsis tenella from the Coastal Area of Geomun-do, Korea

한국 거문도 인근해역의 만새우, Parapenaeopsis tenella의 개체군 동태

  • Oh, Taek-Yun (National Fisheries Research and Development Institute of Korea) ;
  • Cha, Hyung-Kee (National Fisheries Research and Development Institute of Korea) ;
  • Choi, Jung-Hwa (Pukyong National University)
  • Published : 2004.02.01


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 one 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 mm 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 ($CL_{50}$), 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 $L_{\infty}$ = 21.99 mm CL for females, and K = 2.00 $yr^{-1}$ and $L_{\infty}$ = 15.00 mm CL for males) growth curves showed that females grew faster and reached a larger size at age than males.


Parapenaeopsis tenella;growth;maturation;fecundity;Geomun-do


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