采苗器投放水层对虾夷扇贝和紫贻贝附苗的影响

为利用海洋中贝类幼虫资源,优化虾夷扇贝、紫贻贝采苗技术,在旅顺黄海沿岸虾夷扇贝采苗海区投放贝类采苗器,位置距离水面分别为2、3、4、5、6、7、8、9和10 m,共设9组;贝类采苗器投放40 d,观察2~10 m水层虾夷扇贝及紫贻贝附苗数量,研究贝类采苗器投放水层对虾夷扇贝和紫贻贝附苗的影响。结果显示:在设定水深范围内,虾夷扇贝附着数量随着水层深度增加逐渐增多,6 m以下水层虾夷扇贝附着数量多,差异不显著;贻贝附着数量随着水层深度增加而减少,在5 m以上水层附着数量多,差异不显著,5 m以下水层附着数量急剧减少。因此,采集贻贝苗种利用5 m以上水层效果好,尤其是2~3 m水层,如果采集虾夷扇贝苗种可以利用6 m以下水层。

The effects of collector location layer on the spatfall of larvae in Patinopecten yessoensis and Mytilus edulis

In order to utilize shellfish larvae resources in the ocean and optimize the technique for larvae collection of Patinopecten yessoensis and Mytilus edulis, collection bags were set in coastal areas of the Yellow Sea in Lvshun for larvae collection.nine groups of collectors were set 2 m,3 m,4 m,5 m,6 m,7 m,8 m,9 m and 10 m from water for 40 d to observe the quantity of larvae of P.yessoensis and M.edulis and research the effect of different depth of seawater on the larvae collection.The results showed that, in the depth of our trail, the number of P.yessoensis larvae collected was increasing as it went deeper, and in a depth of 6 m or more, a good number of larvae were collected, but it didn' t show a significant difference in quantity;the number of M. edulis larvae collected decreased as the depth got greater, and a depth of 5 m or less brought a good quantity without significant difference in quantity, while it got decreasing sharply when it went to 5 m or deeper.Thus, for larvae collection of P.edulis, a depth of 5 m or less would be better, and 2-3 meters would be optimal;for P.yessoensis, a depth of 6 m or more was recommended.