绿鳍马面鲀年龄生长与合理利用

对东海区的绿鳍马面样本鱼进行生物学测定 ,测出各龄鱼的年轮轮径及椎体半径 ,逆算出各龄鱼的理论平均全长 ,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尾数、单位补充量平均资源重量、渔获物平均年龄和单位补充量渔获量的情况。结果表明 ,该资源已过度捕捞 ,应采取降低捕捞强度和将开捕年龄控制为 3龄等措施进行合理利用和保护

Age and growth of Thamnaconus septentrionalis and rational exploitation

Based on the biology data measured in the Thamnaconus septentrionalis samples from East China Sea and the growth ring and centrum radius measured at each age, the theoretical average total length back-operated at each age and the growth parameters, were calculated and, then, the growth regular pattern was discussed. B-H model is adopted to analyze catch numbers per recruit, average stock weight per recruit, average age of catch and catch amount per recruit. The results show that the stock of T.septentrionalis has been overfished. To protect and exploit rationally this resource, the fishing mortality coefficient must be reduced and the first capture age should be put off till 3 years of age.