东海大管鞭虾生长参数及持续渔获量分析

Population Dynamics and Estimation of Sustaining Yield for Solenocera melantho in the East China Sea

大管鞭虾为东海区桁杆拖虾作业重要的渔获对象。本文根据2006-2008年桁杆拖虾监测调查数据整理的各月体长频率数据,应用FiSATⅡ软件分析结果表明:Von Bertalanffy生长方程的参数为K=1.1,极限体长L∞=149.63 mm;根据生长参数和栖息地平均水温估算的自然死亡系数M=1.779 4,由变换体长渔获曲线法估算的总死亡系数Z=4.896,利用率E=63.66%,开捕体长Lc=97.75;应用长度结构的VPA方法估算的年平均资源量为42.47×109-ind、3.56×104-t。通过单位补充量产量、产值分析表明,该群体已过度利用,应降低开发率和捕捞努力量水平,以使得尽可能降低成本的基础上合理、持续利用大管鞭虾资源。

Solenocera melantho was the most important species by shrimp trawl in the East China Sea. The monthly length-frequency data of Solenocera melantho obtained during 2006-2008 in the East China Sea were analyzed by the FiSAT II （Version 1.2.2）. The result showed that the growth parameters of Von Bertalanffy growth equation was L∞=149.63 mm, K=1.1, t0=0.283; Natural Mortality Coefficient（M） was 1.779 4 from Pauly equation according to growth parameters and average water temperature; Total Mortality Coefficient （Z） was 4.896 that got from length-converted catch curve with biology datum; Fishing Mortality Coefficient （F） was 3.117 and exploitation rate（E） was 63.66%; The Steady-state Biomass was 42.47×10^9 ind or 3.56×10^4 t by using Length-Structured Virtual Population Analysis. Yield-per-recruit analysis and the value of yield-per-recruit analysis according to Beverton-Holt and Thompson-Bell model indicated that the stock resource of Solertocera melantho had been exploited to excess, E and f-factor should be reduced and we should get the most value to achieve the sustainable use of Solenocera melantho.