冷冻浓缩海链藻在南美白对虾育苗中的应用

Application of Frozen Concentrated Thalassiosira weissflogii on Litopenaeus vannamei Seedling

研究冷冻浓缩海链藻培育南美白对虾(Litopenaeus vannamei)幼体效果,为开发南美白对虾开口饵料提供参考。首先探索了冷冻浓缩海链藻单独以及和配合饲料复合在南美白对虾Z1、Z2阶段使用对南美白对虾变态的影响。结果表明,使用冷冻浓缩海链藻,南美白对虾可以完成溞状阶段到糠虾阶段的变态。进一步研究南美白对虾Z1、Z2阶段单独使用冷冻浓缩海链藻、冷藏普通浓缩海链藻,以使用新鲜海链藻和虾片作为对照,每组2个重复,每个重复3万尾南美白对虾幼体,在500 L育苗桶中饲养7 d。结果表明,在南美白对虾Z1、Z2阶段用藻,3种状态藻使用效果近似,相比只使用虾片的组,均有更高的变态成活率、更短的变态期。冷冻浓缩海链藻可以保证较高的幼体变态存活率,便于长期保存,可以作为南美白对虾开口饵料使用。

The feeding trial was conducted to study the effects of frozen concentrated Thalassiosira weissflogii on the survival rate of Litopenaeus vannamei larvae and provide the theoretical basis for shrimp’s start-feed.Firstly,the experiment explored the influence of frozen concentrated Thalassiosira weissflogii on metamorphosis of Litopenaeus vannamei in Z1 and Z2 stages with or not compound feed.The results showed that the metamorphosis of Litopenaeus vannamei could be completed from the mire stage to the mysis stage by using the frozen concentrated Thalassiosira weissflogii.The experiment further studied the effect of using frozen,cold-stored common concentrated Thalassiosira weissflogii on the metamor-phosis of Litopenaeus vannamei in Z1 and Z2 stages,using fresh non-concentrated Thalassiosira weissflogii and shrimp feed treatment group as control.Each group had 2 replicates,and each replicate had 30000 Litopenaeus vannamei larvae,which were raised in a 500 L nursery barrel for seven days.The results showed that using algae in Z1 and Z2 stages of Litopenaeus vannamei had higher metamorphosis survival rate than using shrimp feed only.Frozen concentrated Thalassiosira weissflogii could ensure high larval metamorphosis survival rate,facilitate long-term preser-vation,and could be used as start-feed for Litopenaeus vannamei.