2个凡纳滨对虾选育群体亲虾形态特征及其产卵量、孵化率的比较

Comparison of morphological characteristics,fecundity and hatchability on two breeding groups of Litopenaeus vannamei broodstock

本研究对A、B两个凡纳滨对虾选育群体的亲虾形态特征及其产卵量和孵化率进行比较,结果表明A、B群体的体型性状存在一定差异,尤其是体重、体长、头胸甲长、第二腹节高和尾节长存在显著差异(P<0.05),其他形态性状差异不显著(P>0.05)。两个群体亲虾产卵量分别为(0.65±0.20)×104、(0.64±0.18)×104粒/体重(g),差异不显著(P>0.05),但无节幼体量和孵化率差异显著(P<0.05)。A群体产卵量与体型不显著相关(P>0.05),亲虾产卵量(Y,×104粒)与体重(W,g)的回归方程:Y=0.010 3W1.0878(R2=0.410 3);B群体凡纳滨对虾亲虾体重与产卵量显著相关(P<0.05),亲虾产卵量(Y,×104粒)与体重(W,g)的回归方程:Y=0.054 5W0.677 8(R2=0.522 8)。

In the paper, the morphological characteristics and fecundity, hatchability on different breeding groups of Litopenaeus vannamei broodstock were studied, respectively. The results showed that there were no significant difference between A group and B group except body weight, body length, carapace length, the second segment height and telson length. The spawning amount of A and B group were respectively （0. 65 ± 0. 20） ×104, （0. 64 ± 0. 18 ）×10^4 individual/body weight （g） （ P 〉 0. 05 ）. However, there were signifi- cant differences on the nauplii amount and hatching rate （ P 〈 0. 05 ）. There was significantly correlated on body weight and fecundity of B group of Litopenaeus vannamei broodstock （P 〈 0. 05）, the broodstock spaw- ning quantity （ Y, million） and weight （ W, g） regression equation was ： Y = 0. 054 5 W0.6778 （ R2 = 0. 522 8 ）. There was no significantly correlated on morphometric＇character and fecundity of A group of Litopenaeus vannamei broodstock （P 〉 0. 05 ）, the broodstock spawning quantity （ Y, million） and weight （ W, g） regression equation was： Y=0. 010 3W1.0878 （R2 =0. 410 3）.