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通过对陆水水库三种鳜属鱼类的食性及消化器官比较,结果表明,三种鳜都以摄食鱼虾为主,在鳜和大眼鳜的食物组成中,虾的出现率分别为82.35%和81.03%,鱼的出现率分别为47.06%和31.23%,斑鳜中鱼和虾的出现率分别为63.07%和50.07%,鱼虾出现率在不同月份变化较大。鳜摄食强度最大,大眼鳜次之,斑鳜最小。但它们摄食鱼的饱满分指数均大于虾。在消化器官中,鳜、斑鳜,大眼鳜的幽门盲囊的平均数量分别为250.8、108.2、84.1。随着体长的增加,大眼鳜和斑鳜的肠长也相应增加,而鳜的肠长趋于稳定。本文还对三种鳜在食性上出现差异的原因进行了讨论,认为消化能力的大小、食物的可获得性、食物的选择性及对环境的要求等是出现差异的主要因素。
The results showed that the three species of pomfret were mainly fish and shrimp, and that of pomfret and pomfret in the composition of shrimp were 82 .35% and 81.03% respectively. The occurrence rates of fish were 47.06% and 31.23% respectively. The occurrence rates of fish and shrimps in spotted crabs were 63.07% and 50.07% Varies in different months.鳜 feeding intensity of the largest, followed by big eyes, spotted the smallest. However, the full sub-indices of their consumption of fish were greater than that of shrimp. In the digestive organs, the average number of pyloric blind sacs of 鳜, 斑 鳜, 大 眼 分 were 250.8,108.2,84.1. With the increase of body length, the gut length and the length of the gazania increased correspondingly, while the gut length tended to be stable. This paper also discussed the reasons for the differences in food habits between the three species of pomfret, and concluded that the main factors causing the differences are digestibility, food availability, food selectivity and environmental requirements.