不同食物与放养水层对九孔鲍生长的影响

采用室内池子多层笼养殖方式 ,以加工海带、鲜江艹离 与 A,B2种片状饲料为饵料 ,试验了不同食物与不同放养水层对九孔鲍生长影响 ,结果表明 :( 1)从壳长增长上 ,海带与饲料 B近似 ,各为 11.3与 11.2 mm;其次为饲料 A,10 .2 mm;而江 艹离 最差 ,仅 7.7mm;( 2 )在体重增长上 ,以饲料 B最高 ,平均每只为 3.3g,其次为饲料 A与海带 ,平均每只 2 .9g,而江艹离 仅 1.8g;( 3)从试验期间所获体重增长比壳长增长看 ,两种饲料 ( B为 2 95,A为 2 84 mg/mm)均比两种海藻高 (海带为 2 57,江艹离 为 2 34mg/mm) ;( 4 )从垂直 11层笼子九孔鲍生长的比较 ,下层的好于上层 ,越是下层越好 ,投喂两种饲料在体重上差别更明显。

Effect of Foods and Water Depth on the Growth of Haliotis diversicolar aquatilis in Tank

An experiment on the effect of four types of foods at various water depths on growth of Young H. diversicolar aquatilis was carried out in indoor tank for 52 d. Two types of manufactured foods (diet A and B) and two types algae ( Gracilaria tenuistitata and Laminaria japonica ) were fed. The result shows that: increase in shell length for those abalones fed on Laminara and diet B was nearly the same (11 3 and 11 2 mm respectively), but the increase of those fed on diet A and Gracilar was slower (10 2 and 7 7 mm respectively). By using diet B, the highest weight gains (3 3 g). By using diet A and Laminaria, the weight grows moderately (both are 2 9 g), while using Gracilaria, the increase of weight was lowest (only 1 8 g). According to the data of the ratio of increased weight and shell length within 52 days, the effect of diet B and diet A were better than that of the two seaweeds. The ratios for diet B and A, Laminaria and Gracilaria were 295, 284, 257 and 234 mg/mm respectively. A comparison of the growth rate of the abalone on each layer of the 11 layer vertical cages showed that the lower the layer the faster the abalone grew.