关键词: 三角鲂, 生长特性, 单位补充量模型, 种群资源

Abstract: In the present study, the data of Megalobrama terminalis from Qiantang River were analyzed by the FiSAT Ⅱsoftware, and the growth and mortality parameters as well as the exploitation status of M. terminalis were obtained based on analysis of yield per recruitment (YPR) models. The results showed that the relationship between body length and body mass was expressed as W = 0.014 2× L^{3.130 3} (R²=0.979 3, P<0.001), the Von Bertalanffy growth equation was selected as an optimal growth criteria and was expressed as L_t =57.6×[1-e^{-0.18×( t+1.31)}], and the growth inflexion point was 5.03 a. The total mortality rate (Z), natural mortality (M), fishing mortality rate (F) and the current exploitation (E) of M. terminalis were 1.04, 0.43 , 0.61 and 0.59 by ELEFANⅠmethod, respectively. Moreover, the Beverton-Holt dynamic model was developed to predict the opening catch size of M. terminalis as 23.98 cm. The results of this study showed that the resources of M. terminalis in Qiantang River were utilized greatly and faced certain fishing pressure.

Key words: Megalobrama terminalis, growth characteristic, yield per recuruitment (YPR) model, population resource