高产精养池塘中生态因素对鲢、鳙生长速度影响作用的研究

采用多元回归分析方法,将静水高产精养食用鱼池塘中各种规格鲢鳙日增重率与水温、贮存量、浮游动物及易消化浮游植物生物量等多种因素的关系,经微机运算分析,建立了最优回归方程(以下简称回归方程),确认贮存量和水温是影响日增重率的两个重要因素。并确定鲢、鳙的最适贮存量。为定量分析高产精养池塘中诸生态因素对鱼类生长速度的影响作用和确定其作用程度(主次关系)建立了有效的现代分析方法,对研究提高池塘鱼产量及拟定科学放养和生产模式具有重要实际意义。

A study on ecological factors having influence up the growth rate of silver and bighead carp in the intensive culture and high yield ponds

With microcomputer, multivariate regression analysis (MVRA) method was used to form optimal regressive equation describing the relation between day growth ratio of silver carp (Hypophthalmichthys molitrix (Cuvier et Valeciennes)) and bighead carp (Aris-tichthys nobilis (Richardson)) and water temprature, stocking weight,biomass of zooplank-ton and digestible plankton in the high yielging, static water ponds. It is deter mined that silver and bighead carps stocking weight (0. 132 - 0. 633 kg/m2) and water temperature are two important factors affecting thegrowth rate. The optimal stocking weight of silver and bighead carp is 0. 638 kg/m2.. Mean biomass of zooplankton (6.89 - 12. 07 mg/L) and digestible plankton (50. 65 - 76. 68 mg/L) have no significant influence on the growth rate of silver and bighead carp under the feeding condition.MVRA is a useful method in quantative analysis on influence of various ecological fac- tors on fish growth ratio and determine their function (primary and secondary relation) in the high yielding ponds. It is helpful in improving fish yield, planing the stocking density and making production model.