Population biology of the largemouth bass, Micropterussalmoides from Goe-san lake, Korea

摘要

The population biology of Micropterus salmoides were examined in Goe-san Lake from March 2010 to February 2011. The development of ovary and testis was separated into 5 stages by the criteria. The ratio of females to males increased with total length. Females were sampled in slightly larger size and greater number. Mean size and age was greater for females (255 mm total length and 2.03 years, respectively) tnan males (227 mm and 2.44 years, respectively). Growth was described by 3 parameter von Bertalanffy model by otoliths as L_t = 459.01(1-exp[-0.126(t+0.416)]). The spawning season of M. salmoides was from April to June, with a peak in May by the gonadosomatic indices and the monthly proportions of female and male gonad stages. Ripe females were collected during the spawning period. Mean fecundity was 27656±1424 oocytes every female. Fecundity was positively correlated with total length, and it was described by mean fecundity 202.4 Total length - 38188. Higher fecundity well indicated that the largemouth bass has a flexible spawning strategy and has acclimatized well to Goe-san Lake.