摘要
根据上世纪90年代及60年代的生物学资料,运用体长频率分析法估算二长棘鲷的生长和死亡参数。vonBertalanffy生长方程的主要参数L∞=27.3cm,K=0.45,t0=-0.34;体重的生长拐点为2.12龄;瞬时总死亡率(Z)、瞬时自然死亡率(M)和瞬时捕捞死亡率(F)分别为2.825,1.045和1.78。当前开发率为0.63,资源处于过度利用状态。根据等渔量曲线图分析,当前的捕捞强度过高,而开捕年龄和开捕体长过低,资源出现衰竭现象。综合考虑当前的捕捞强度和社会经济效益,建议北部湾二长棘鲷的最适开捕年龄大于1龄,开捕体长大于120mm。
Based on lengthfrequency data of crimson sea bream Parargyrops edita collected in Beibu Bay in the 1990's and 1960's growth and mortality parameters were estimated using ELEFAN Ⅱtechnique in FiSAT. The estimated parameters for von Bertalanffy growth equation was L∞=27.3cm ,K=0.45, t0=-0.34; the turning point on body weight growth curve of the stock was situated at t=2.12; the instantaneous rate of total mortality (Z) was Z=2.825,and the instantaneous natural(M) and fishing mortality(F) rates were 1.045 and 1.78 respectively. The exploitrate in recent years was 0.63,and is in a state of overexploitation.According to the curve of equal catch,the fishing intensity was too high but the catch age and bodylength were too low ,so the stocks declined.Considering fishing effort and socialeconomical benefit,this paper suggests that the optimum catch age should be above one year and body length above 120mm.
出处
《水产学报》
CAS
CSCD
北大核心
2003年第3期251-257,共7页
Journal of Fisheries of China
基金
广东省重大科技兴海项目(A200099E01)
