吉富罗非鱼生长模型研究

Growth model of GIFT strain tilapia(Oreochromis niloticus)

采用Von Bertalanffy生长方程(VB GF)、逻辑斯谛生长方程(Logistic GF)、Gompertz生长方程(Gompertz GF)和灰色动态生长方程(GD GF)等4种常用动物生长模型对网箱养殖的吉富品系尼罗罗非鱼(Oreochromis niloticus)的生长进行拟合,根据各模型拟合残差平方和的大小判断拟合程度。结果表明:VB GF生长模型对体重生长的拟合效果最好,而Gompertz GF生长模型对吉富罗非鱼体长生长的拟合效果最好。从实际拟合结果综合评价来看,VB GF生长方程最好,体长、体重生长方程分别为Lt=39.008(1-1.005e-0.08t),R2=0.993;Wt=1514.50(1-1.025e-0.101t)3,R2=0.999,体重生长拐点为11.13月龄,相应的体长为22.92 cm,体重为448.74 g。吉富罗非鱼生长模型可以用于描述罗非鱼生长过程,反映机体生长发育规律,可为罗非鱼规模化养殖和选育工作提供参考。

The experiment dealed with the growth and growth model of cage-reared GIFT strain tilapia（Oreochromis niloticus）,Von Bertalanffy growth function,Logistic growth function,Gompertz growth function and grew dynamic growth model were used for fitting the weight and length growth of tilapia.The results showed that Von Bertalanffy growth function was the most precise model to fit the weight growth,and Gompertz growth function was the most precise model to fit the body length growth.According to the fact of cultivation and sum of residual squares,Von Bertalanffy growth function was selected as optimal model to fit the growth of tilapia,for body length by Lt=39.008（1-1.005e-0.08t）,R2=0.993,for body weight by Wt=1514.50（1-1.025e-0.101t）3,R2=0.999.The growth inflection point was at t=11.13 month,corresponding to Lt=22.92 cm,and Wt=448.74 g.The growth model of tilapia can describe the process of tilapia growth,so that it can be used for mass production and selective breeding in tilapia.