切除单侧眼柄对不同体质量养殖斑节对虾卵巢发育及产卵的影响

在盐度31、水温28~29℃下,进行了4次卵巢诱导试验,研究了切除单侧眼柄对体质量56.4~105.4g的养殖斑节对虾卵巢发育和产卵的影响及卵巢发育、产卵与体质量之间的关系。结果显示,切除单侧眼柄诱导养殖斑节对虾卵巢发育成熟,成功率(y)与雌虾体质量(x)显著相关(P0.05),雌虾体质量越小,诱导成功率越低,回归方程为:y=133.92lnx-535.63(r2=0.9297)。养殖斑节对虾眼柄手术后,最快10d产卵,部分雌虾能重复产卵。产卵量(y)与雌虾体质量(x)显著正相关(P0.05),雌虾体质量越小,产卵量越小,回归方程为:y=122.22lnx-472.2(r2=0.9738)。雌虾累积死亡率、卵子直径和卵子孵化率与雌虾体质量无显著相关性(P0.05)。建议用体质量80g以上的养殖斑节对虾雌虾作为亲虾。

Effects of Unilateral Eyestalk Ablation on Ovary Development and Spawning of Cultured Tiger Shrimp Penaeus monodon with Different Body Weight

The effects of unilateral eyestalk ablation on ovary development and spawning were studied in cultured tiger shrimp Penaeus monodon with body weight from 56 .4 g to 105 .4 g in 4 trials to evaluate the relationship between ovary development and spawning and body weight of cultured tiger shrimp .The re‐sults showed that ovary maturation of cultured tiger shrimp was induced by unilateral eyestalk ablation , with maturation success rate (% ) ,significantly related to the body weight of female logarithmically (P<0 .05):y=133 .92lnx-535 .63(r2 =0 .9297) .The smaller female was ,the lower maturation success rate was .The tiger shrimp females with eyestalk ablated spawned as early as the 10th day after ablation ,some females spawning repeatedly .The fecundity was found to be significantly positively related to the body weight of female logarithmically (P<0 .05):y=122 .22ln x-472 .2(r2 =0 .9738) ,the smaller the female was ,the less egg production was .The accumulative mortality of female ,egg diameter and hatching rate were not significantly related to the body weight of female .The cultured tiger shrimp females with body weight of ≥80 .0 g is recommended for broodstock .