去眼柄对凡纳滨对虾稚虾蜕皮和生长的影响

Effects of Eyestalk Ablation on the Molting and Growth of Juvenile Litopenaeus vannamei

研究了去眼柄对凡纳滨对虾 (L itopenaeus vannamei)稚虾蜕皮和生长的影响。实验在水族箱内进行 ,实验对虾的初始体重约为 2 .2 6 g,投喂的饲料为人工配合饲料 ,实验持续 4 0 d。实验结果如下 :1.在本实验条件下 ,去眼柄显著加快了凡纳滨对虾稚虾的蜕皮 ,蜕皮周期由原来的 14 .6 d缩短到 11.4 d(P<0 .0 5 ) ;2 .在本实验条件下 ,去眼柄凡纳滨对虾稚虾的摄食率 (FId)和食物转化效率 (FCEd)分别比正常组低 7.91%和 6 .2 3% ,特定生长率 (SGRd)比正常组低 14 .74 % ,但经检验差异均未达到显著水平 (P>0 .0 5 ) ;3.在本实验条件下 ,去眼柄对虾用在蜕皮的能量比正常组高5 4.39% ,经检验差异达到显著水平 (P<0 .0 5 ) ,而其他各部分能量比例差异不显著 (P>0 .0 5 )。实验结果表明 :在本实验条件下 ,去眼柄缩短了对虾的蜕皮周期 ,但对对虾的生长并未产生显著的影响 (P>0 .0 5 )。

The effects of eyestalk ablation on the molting and growth of juvenile L. vannamei are investigated. The shrimps were kept in glass aquaria and fed with artificial pellet. The initial wet weight of the shrimp is about 2.26g. This experiment lasted for 40days. The results show that: 1.The effect of eyestalk ablation on the molting is significant (P<0.05), the intermoult period (IP) is shortened from 14.6d to 11.4d after eyestalk ablation; 2. FI d,FCE d and SGR d of eyestalk ablated shrimp are lower than the intact ones by 7.91%, 6.23% and 14.74%, respectively, but there are no significant differences between them (P>0.05); 3. The energy spent for exuvia of eyestalk ablated shrimp is significantly higher (54.39%) than that of intact ones (P<0.05), but there are no significant differences among the other energy allocations for the two treatments (P>0.05). The results demonstrate that the effect of eyestalk ablation on moulting of Litopenaeus Vannamei is significant (P<0.05), but not significant on the growth of the shrimp (P>0.05).