A study on growth,mortality and rational utilization of Coilia nasus in Oujiang River Estuary
LI Xiafang
YANG Fan
JIANG Rijin
YIN Rui
LAN Dan
SHAN Xiaoluan
Abstract：Based on the data collected in Oujiang River Estuary from 2021 to 2022,the population struc-ture,the length-weight relationship and the growth and mortality of Coilia nasus were analyzed.A to-tal of 1,153 individuals were caught,from which the length-weight relationship were derived as W=0.001 0L3.4151(R2=0.9845),showing a positive allometric growth pattern.The growth parameters of von Bertalanffy formula estimated by ELEFAN Ⅰ of FISAT Ⅱ were 38.90cm(L∞),0.44(k)and-0.56a(t0).The total mortality Z estimated by length-converted catch curve was 2.47 while the natu-ral mortality M and fishing mortality F were 0.79 and 1.68,respectively,and the exploitation rate was 0.68.Beverton-Holt yield per recruitment model simulation showed that Yw/R trends to increasing and then decreasing with the increase of fishing mortality(F).The biological reference points Fmax and F0.1 were 1.54 and 0.64,respectively.C.nasus stock has been over-exploited.We propose that the body length at first capture should be increased to 22cm,and the fishing pressure reduced to ensure sustain-able use of the resource.
Keywords：Coilia nasuslength frequencyyield per recruitmentresource statusOujiang River Es-tuary
Publication Date：2025-12-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：8( 221-228 )