Abstract:

Based on lengthfrequency data collected from trawl fishery survey in the Mudong Reach of the Three Gorges Reservoir from July, 2007 to November, 2008, growth, mortality and recruitment of juvenile 〖WTBX〗Coreius guichenoti〖WTBZ〗 were estimated using FisatⅡsoftware.The results are summarized as follows:the length of 〖WTBX〗C.guichenoti〖WTBZ〗 population ranged from 20 to 231 mm, 40～80 mm being predominant; the relationship between body length (mm) and body weight (g) can be expressed as W=1×10-5L3030 2; the estimated parameter for von Bertalanffy growth equation was L∞＝694 mm，〖WTBX〗K＝016，t0＝-0748. Total mortality〖WTBX〗 (Z)〖WTBZ〗 was estimated as 3101 a-1, natural mortality〖WTBX〗 (M) 0.346 7 a-1, and fishing mortality (F) 2754 3 a-1. The recruitment pattern was continuous with one major peak within the months from April to July.The exploitation rate in recent years was 089,and the resources of C.guichenoti were on the state of overexploitation in the study area.Therefore,it is suggested that protection and management of fish resources should be intensified,fishing ban period should be adjusted and the trawl net should be banned in order to restore and conserve the 〖WTBX〗C.guichenoti〖WTBZ〗 resources.〖