枝角类对黄鳝稚鱼存活及生长的影响

Effects of Cladocerans on the Survival and Growth of the Larvae of Rice Field Eels

摘要: 与黄鳝(Monopterus albus)育苗中常用的配合饲料及熟蛋黄相比，探讨枝角类作为黄鳝稚鱼(体长为33.09 ± 0.72 mm，体重为24.35 ± 2.26 mg)开口饵料的可利用价值，本研究在玻璃温室大棚中对上述3种饵料进行了为期24天的对比观察试验。结果表明：以枝角类作为黄鳝稚鱼的开口饵料，稚鱼成活率最高(达到100%)，极显著地高于蛋黄组(P < 0.01)，与配合饲料组的成活率无显著性差异(P > 0.05)；枝角组黄鳝稚鱼生长速度最快，其体长为51.02 ± 2.06 mm，体重为91.10 ± 12.22 mg，极显著地高于蛋黄组和配合饲料组(P < 0.01)；黄鳝稚鱼12日龄后会明显观察到其主动摄食枝角类，20日龄后更偏好于枝角类中的蚤状溞(D. pulex)。本研究表明枝角类能够满足黄鳝在30日龄内对营养的需求，具有作为黄鳝开口饵料的开发价值。

Abstract: To study the exploitation of cladocerans as a kind of opening diet of Eels larvae (Monopterus albus) with body length was 33.09 ± 0.72 mm and body weight was 24.35 ± 2.26 mg, cladocerans were used in the glass greenhouse for a period of 24 days in comparison with the formula feed and cooked egg yolk used in the larvae of Rice Field Eels. The results showed that the survival rate of larvae fed with cladocerans was the highest (100%), which was very significantly higher than that of egg yolk group (P < 0.01), but there was no significant difference between it and formula feed group (P > 0.05). The fastest growing of larvae also occurred in group fed with cladocerans, with an average body length of 51.02 ± 2.06 mm, average body weight of 91.10 ± 12.22 mg, which was very significantly higher than that of other treatment groups (P < 0.01). More preference in D. pulex of 20-day-old eels was observed directly during the research. This study shows that Cladocera can meet the nutritional needs of eel in 30 days of age, and has the development value as eel opening diet.