碧流河水库斑鳜的食性及其渔业利用

FEEDING HABIT AND FISHERY UTILIZATION OF SINIPERCA SCHERZERI IN BILIUHE RESERVOIR

对碧流河水库斑鳜胃含物分析结果表明：（１）斑鳜以小型野杂鱼类和虾类为主要食物，其中虎鱼、餐条和虾类的出现率分别为２４．６４％、１２．２３％和２２．０８％。鲢、鳙在斑鳜的食谱中也占有一定比例，出现率为５．６６％、２．７４％。（２）体长２１．５ｃｍ以上的斑鳜对鲢、鳙鱼种造成危害，可吞食１２．６ｃｍ以上的鱼种。（３）斑鳜的食物组成存在明显的季节变化，其中掠食鲢、鳙鱼种主要有两个时期，即鱼种放库后的１０－１１月和斑鳜生殖前的４月－６月上旬。对其在该水库渔业中的地位及渔业利用进行了讨论，并对放养鲢、鳙鱼种的规格。

This paper deals with the feeding habit and fishery utilization of Siniperca scherzeri. About 865 stomachs of the specimens, were examined and analysed. The results are as follows: (1) S. scherzeri is a predacious fish feeding mainly on various kinds of small fishes and shrimps. The frequencies of occurrence of Gobiidae, Hemiculter leucisculus, and shrimps are 24.64%, 12.23% and 22.08% respectively. Hypophthalmichthy molitrix and Aristichthys nobilis are also found in the recipe of the fish. with their frequencies of occurrence 5.66% and 2.74%.(2). The fishes over 21.5cm in standard length do harm to the seedlings of H. molitrix and A. nobilis as they can swallow the seedings below 12.6cm in total length. (3). Food composition of the fish varies obviously in different months. The fish preys the seedlings during the two periods, from October to November and from April to 10 June. On the basis of analyzing the feeding habit and the economic value of S.scherzeri, the effect of the fish on the Biliuhe reservoir fisheries are discussed. Finally, rational fishery utilization and the stocking details are also suggested.