Fecundity of Paracanthobrama guichenoti in Lake Cheng

Abstract:

The aim of the present study was to identify the distribution, change and relationship of the individual absolute fecundity (F) and relative fecundity (F_L in eggs/cm and F_W in eggs/g) .48 specimens of Paracanthobrama guichenoti were obtained from Lake Cheng in 2008.F varies from 17 100-38 300 (average 24 500) eggs, F_L from 940-1 520 (average 1 130) eggs/cm, and F_W from 95-155 (average 119) eggs/g.The relations of F of Paracanthobrama guichenoti to body length, body weight and age are shown to be quadratic, linear and cubic positively, respectively.The relations of F_L to body length and body weight are shown to be cubic positively, but F_W is not related to body character indexes.The mature fish should have the body length from 21-23 cm and age from 2-3 years.Curve estimation regression analyses via SPSS software showed its F and F_L significantly related with body length, weight and maturing coefficient, but relative fecundity per gram (F_W) only with maturing coefficient.Futhermore, based on the relationship between individual fecundity and morphological indices, the individual fecundity and reproduction ability of fish population should be estimated and forecasted.Overall, the results of the present study indicated that the relationship between body weight and fecundity was closer than that of body length and age, in a way, it is suitable to use the body weight of Paracanthobrama guichenoti to estimate the population productiveness.