摘要
根据1996—1998年期间在珠江口及邻近海域采集的鳓鱼(IlishaelongataBennett)生物学资料,应用FiSATⅡ软件进行鳓鱼的生长和死亡参数估算。用ELEFANⅠ技术拟合的vonBertalanffy生长方程参数分别为L∞=53.13cm(叉长)、k=0.37a-1及t0=-0.62a,用Pauly经验公式计算的自然死亡系数为M=0.74,以长度变换渔获曲线法估算的总死亡系数为Z=2.53。运用Beverton Holt模型分析该群体的最适捕捞死亡系数为F=2.5,最适开捕年龄和叉长分别为1.6龄和29.8cm,目前该群体已处于捕捞过度状态,尤其以捕捞幼鱼的问题较为突出。建议南海北部鳓鱼的最小可捕规格应为叉长30cm。
Based on the biological data of Chinese herring Ilisha elongata (Bennett) collected in the Zhujiang River estuary and its adjacent sea areas from 1996 to 1998, the growth and mortality parameters of the stock were estimated by using FiSATⅡpackage. The growth parameters of von Bertalanffy formula estimated by ELEFANⅠwere L_(∞)=53.13cm (fork length), k=0.37yr^(-1)(time series of fork length frequency) and t_(0)=(-0.62)yr (original growth age), respectively. The natural mortality calculated by (Pauly's) empirical equation was M=0.74. The total mortality estimated by length-converted catch curve was Z=2.53. The assessment results by using Beverton-Holt model indicated that the optimum catchable age and fork length were 1.6yr and 29.8cm, respectively. The stock has been overexploited mainly due to the capture of under-sized juveniles. It is suggested that legal fork length of Chinese herring should be 30cm at the first capture in the northern South China Sea
出处
《热带海洋学报》
CAS
CSCD
北大核心
2004年第4期42-48,共7页
Journal of Tropical Oceanography
基金
南海北部主要经济鱼类渔业生物学样品分析
香港铜鼓水道研究-海豚 /渔业 /底栖生态调查
国家海洋勘测专项 (1 2 6 0 2 0 2 0 3 )
