摘要
对采自东海区的315尾黄鲫样本鱼进行生物学测定,使用Bhattacharya方法把所获样品体长频率分布划分成不同的平均体长组,推算出各个组的年龄,求出生长参数,探讨生长规律。再依据B-H模型计算、分析在不同开捕年龄和不同捕捞强度下的单位补充量渔获量(YN/R和YW/R)、单位补充量资源量(PW/R和PN/R)、渔获质量(平均体质量Wy、平均体长Ly和平均年龄Ty)的情况。结果表明,该资源已过度捕捞,应采取适当措施来保持资源的可持续利用:若保持当前捕捞强度不变,则必须把开捕年龄限制在2.38龄较合适;若能同时改变捕捞强度和开捕年龄,则可以把当前的开捕年龄限制在1.50龄,捕捞死亡率降到1.34,这样黄鲫资源仍能够得到保护和合理利用。
Based on the biology data of Setipinna taty catched from the East China Sea, several fork-length groups were got by Bhattacharya＇s method, and the age of each fork-length group was inferred. By above results growth parameters were calculated out： L∞= 221.998 6 （mm）, W∞ = 101.934 7 （g）, K = 0.328 8, t0= -0.891 6. The relation between body length and fork weight, W = 3.30×10^-6N FL^3.19211 （r ： 0. 975 1）, was got by regression. Other parameters of B-H model were got by the following methods： firstly, based on passed data the maximum age （tλ） of Setipinna taty was 5 a; secondly, based on recent data it was got that recruit age （tτ） and first capture （tc） were both 0.7 a; thirdly, by Pauly＇s experiment equation the nature mortality coefficient （M） was 0.398 4; finally, total mortality coefficient Z = 2.24 was got by averaging the results of two methods, and the fishing mortality coefficient F = 1. 841 6 was got by equation F = Z - M. After all the necessary parameters were got, B- H model was adopted to analyze catch weight and numbers per recruit（ YN/R and Yw/R ）, average stock weight and numbers per recruit （^-Pw/R and ^-PN/R ）, annually average body weight （^-Wy）, fork lenght （^-Ly） and age（^-Ty）. The results show that the stock of Setipinna taty has been severely overfished. To protect and exploit this resource rationally, if the current fishing intensity is kept, the first capture age should be put off till 2.38 years of age; in another way the first capture age should be put off till 1.50 years of age and the fishing mortality coefficient must be reduced to 1.34 simultaneously.
出处
《中国水产科学》
CAS
CSCD
北大核心
2006年第3期485-491,共7页
Journal of Fishery Sciences of China
基金
国家重点基础研究发展规划项目(G1999043712)
科技部公益性项目(2002-2003)
关键词
黄鲫
资源状况
合理利用
Setipinna taty
resources status
rational exploitation
作者简介
刘勇（1977-）,男,实习研究员,从事海洋渔业资源与生态学研究.E-mail：liuyong7707@yahoo.com.cn
通讯作者：程家骅.E-mail：ziyuan@sh163.net
