金沙河水库鲢、鳙生长特征及起捕规格的研究

CAPTURED STANDARD AND GROWTH CHARACTERISTICS OF SILVER CARP(HYPOPHTHALMICHTHYS MOLITRIX) AND BIGHEAD CARP(ARISTICHTHYS MOBILIS) IN JINSHAHE RESERVOIR

2007年在金沙河水库分别取鲢(Hypophthalmichthys molitrix)157尾、鳙(Aristichthys mobilis)53尾样本,对其年龄组成和生长特征进行了研究。结果表明,该水库鲢、鳙均以3～4龄为主。体长和体重的关系式分别为WH=1.0×10-4 L2.5135,WA=2.7×10-5 L2.8705。鲢、鳙的生长规律符合von Bertalanffy生长方程,鲢的生长方程分别为LH=112.1244[1-e-0.1544(t+0.1371)],WH=14189.16[1-e-0.1544(t+0.1371)]2.5135;鳙的生长方程分别为LA=68.5382[1-e-0.396(t-0.3239)],WA=5101.875[1-e-0.396(t-0.3239)]2.8705。根据此方程计算出生长速度和生长加速度方程,并得出鲢、鳙生长拐点分别为5.83龄和3.00龄。与不同水库鲢、鳙生长比较,金沙河水库鲢比鳙生长快。并对金沙河水库鲢、鳙的放养和捕捞规格提出了建议。

Age composition and growth characters were studied to silver carp(Hypophthalmichthys molitrix) and bighead carp(Aristichthys mobilis) specimens collected from September to November 2007 in Jinshahe reservoir.The results showed that the age composition of silver carp and bighead carp in the reservoir was dominated by 3-and 4-years old fishes in catches.The interrelation formulas between the body length(L) and weight(W) of silver carp and bighead carp were WH=1.0×10-4L2.513 5 and WA=2.7×10-5L2.870 5,respectively.Their growth could be described by the von Bertalanffy equation.The equation of silver carp were LH=112.124 4[1-e-0.154 4(t+0.137 1)]and WH=14 189.16[1-e-0.154 4(t+0.137 1)]2.513 5.The equation of bighead carp were LA=68.538 2[1-e-0.396(t-0.323 9)] and WA=5 101.875[1-e-0.396(t-0.323 9)]2.870 5.The growth inflection point of silver carp and bighead carp were 5.83 and 3.0.Compared with different reservoirs,the growth of silver carp is faster than bighead carp in Jinshahe reservoir.At last,the paper put forward the suggestion about stocking and fishing of silver carp and bighead carp to Jinshahe reservoir.