海捕野生曼氏无针乌贼选育F1的生长

Growth Performance of Selective Breeding F_1 from Wild Cuttlefish Sepiella maindroni

2016年从诏安海域捕捞的野生曼氏无针乌贼中,挑选2000尾平均胴长(12.12±0.15)cm、体质量(203.88±14.82)g的成熟个体人工繁育出子代(F_1)后,室内常规饲养,与未经选育的对照组子代的生长性状进行比较。结果显示,拟合0~90日龄体质量(y)与胴长(x_1)、体质量(y)与胴宽(x_2)的生长式型,选育F_1组生长关系y=0.2272x_1^(2.6506)(r^2=0.9825),y=0.5356x_2^(2.9824)(r^2=0.9845),对照组生长关系为y=0.2894x_1^(2.5781)(r^2=0.9953),y=0.6802x_2^(2.7145)(r^2=0.9725),选育F_1组的生长快于对照组;选育F_1组体质量绝对增加率为0.03~0.69g/d,绝对增长率为0.017~0.123cm/d,增积量为0.0001~0.0788,肥满度为0.104~0.374,优于对照组;选育F_1组胴长、胴宽和体质量的现实遗传力分别为0.033~0.599、0.015~0.244和0.001~0.294,说明选育具有一定的效果。

Selective breeding F1 offsprings from 2000 individuals of wild cuttlefish Sepiella maindroni with body weight of （203.88±14. 82） g were reared in an indoor tank to evaluate growth performance compared with the cuttlefish in the control group. The results showed that the fitting formula between body weight （y） and body length（x1）, and between body weight（y） and body width（x2） in 90 days were described as y =0. 2272x12.6508（re=O. 9825）,and y=0. 5356x2^2.9824（r2=0. 9845） for the F1 offsprings and as y=0. 2894 Xl 2. 5781 （r2=0. 9953）, and y= 0. 6802x2^2. 7145 （r2= 0. 9725） for the cuttlefish in the control group. There was better growth in selective breeding F1 than the individual in the control group, with absolute weight gain of （0. 03-0. 69） g/d, absolute length gain of （0. 017--0. 123） cm/d, and condition factor of 0. 104-0. 374, for the selective breeding F1. The breeding F1 had realized heritability of 0. 033-0. 599 in body length, 0. 015--0. 244 in body width and 0. 001--0. 294 in body weight, showing the effects of selective breeding.