不同饵料及其组合对黑鲍幼鲍生长及存活的影响

试验研究人工配合饲料、细基江蓠繁枝变种(Gracilaria tenuistipitata)(下称江蓠)、江蓠 裂片石莼(Ulva faxciata)、江蓠 肠浒苔(Enteromorpha intesinalis)、江蓠 裂片石莼 肠浒苔共5种饵料搭配方式对黑鲍幼鲍生长和存活的影响。试验进行35d,结果表明:(1)不同试验组之间的幼鲍的存活没有显著影响(P>0.05)。(2)不同试验处理对幼鲍的生长有显著影响(P<0.05)。江蓠 浒苔组、人工配合饲料组的黑鲍的特定生长率都显著大于其它饵料组(P<0.05);饲喂混合海藻的黑鲍的特定生长率显著大于单一海藻组(P<0.05)。壳长增长率、湿重增重率和干重增重率亦呈相似趋势。(3)幼鲍对不同饵料组合的转化效率存在显著差异(P<0.05)。试验结果表明,在水温较高时用江蓠、石莼和浒苔组成的混合饵料代替人工配合饲料饲养幼鲍,同样可以达到高的生长率。

Effects of different diet combinations on the growth and survival of juvenile black abalone

A 35-day growth experiment was conducted to assess the effects of five different diet combinations on the survival and growth of juvenile black abalone. The four diets tested were: red algae Gracilaria tenuistipitata(G), the green algae Ulva faxciata(U), Enteromorpha intesinalis(E), and formulated diet. Three different combinations of diets (U E G, U G, E G) and two single diets (G and FD) were designed to investigate their effect on the growth and survival of black abalone. The five combinations were randomly assigned to 5 groups, each had three replicate. The results of the experiment showed that there was no significant difference of the survival rate (P>0.05) under the five diet treatments. The differences of the special growth rate (SGR), wet weight growth rate (WGRw), dry weight growth rate (WGRd) and shell length growth rate (LGR) were significant (P<0.05) under the five diets treatments. Juvenile black abalone in FD treatment supported the highest SGR and WGRd, however, juvenile black abalone in G E treatment had the highest LGR and WGRw. The food conversion efficiency (FCE) had significant differences among the juvenile black abalone under the five diets treatments (P<0.05). The results indicated that E G as well as formulated diet were the best diets for the cultured juvenile black abalone, and could reply the formulated diet at the high temperature water.