不同饵料对厚壳贻贝稚贝生长、存活及淀粉酶活性的影响

为了解不同饵料对厚壳贻贝Mytilus coruscus稚贝生长、存活及消化能力的影响,在温度为18℃、盐度为30的条件下,使用单一湛江等边金藻、青岛大扁藻及其二者的混合饵料(体积比为1∶1)分别投喂壳长为1.31 mm±0.05 mm的厚壳贻贝稚贝,并检测其21 d内的存活率、壳长、壳高、湿质量、特定生长率和淀粉酶活力变化。结果表明:在不同饵料条件下,稚贝的存活率均大于93%,不同处理组间无显著性差异(P0.05);饲养14 d以上时,各饵料组稚贝的壳长、壳高、特定生长率、湿重和淀粉酶活力均为混合饵料组高于其他饵料组;试验结束时,混合饵料组稚贝的各项生长指标及淀粉酶活力均显著高于两个单一饵料组(P0.05)。

Effects of different diets on growth,survival and amylase activity in plantigrades of thick shell mussel Mytilus coruscus

Plantigrades of thick shell mussel Mytilus coruscus with shell length of (1. 31±0. 05) mm were fed algae Isochrysis zhanjiangensis, and Platymonas helgolandica var. tsingtaoensis, and a mixture of the two algae at volu-metric proportion of 1 : 1 at water temperature of 18 ℃ and a salinity of 30 for 21 days, and survival rate, shell length , shell height, wet body weight, specific growth rate ( SGR) and amylase activity of the plantigrades were de-termined in order to understand the effects of different diets on the growth, survival and digestion of thick shell mus-sel juveniles. The results showed that there were no significant differences in survival rates ( over 93%) in all groups(P>0. 05). However, the plantigrades fed the mixture of the two algae had significantly higher SGR, and amylase activity than the animals fed single alga did during over 14 day rearing period(P<0. 05). The findings will provide an important theoretical basis for the cultivation of thick shell mussel plantigrades.