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http://dx.doi.org/10.5657/kfas.2003.36.6.646

Population Dynamics and Reproductive Biology of Leptochela sydniensis in the Southwestern Waters of Korea  

OH Chul Woong (Department of Marine Resources, Mokpo National University)
CHOI Jung Hwa (Department of Marine Eiology, Pukyong National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.36, no.6, 2003 , pp. 646-653 More about this Journal
Abstract
Investigations were made on the population structure, sex ratio, growth, and recruitment patterns of Leptochela sydniensis in the southwestern coastal areas of Korea, between May 2000 and December 2001. Spawning period, fecundity, brood loss, reproductive output, and size at sexual maturity also were examined. The results of the sex ratio showed that females were more numerous than males during the overall study period. Parameters of growth were estimated using the modified von Bertalanffy growth function (VBGF) model incorporating seasonal variation into growth. Females grew somewhat faster and reached a larger size than males $(L\infty=12.80\;mm\;CL\;and\;K=0.70\;yr^{-1}\;or\;females,\and\;L\infty=12.08\;mm\;CL\;and\;K=0.69\;yr^{-1}$ for males). The structure of recruitment patterns obtained by the FiSAT program indicated one normally distributed group. Based on the occurrence of ovigerous females and the gonadosomatic index (GSI), the main spawning season was from June to August. Analysis of covariance indicated that brood loss was not observed during the incubation period. The size at which $50\%$ of females are mature is estimated as 5.48 mm CL.
Keywords
Leptochela sydniensis; Sex ratio; Growth; Recruitment pattern; Reproductive output; Brood loss; Size at sexual maturity;
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