论文部分内容阅读
调查了投饵和不投饵池中零龄及1龄罗非鱼的胃含物,分析了其食性的变化。1.投饵池中零龄及1龄鱼都摄食人工配合饵料及浮游动、植物。但是,摄食浮游动物的比例,零龄鱼约占30%,而1龄鱼占2.5%以下。另外,摄食浮游植物的比例,是受水中浮游植物数量的影响。2.在不投饵池中,零龄鱼摄食浮游动物、植物,水、陆生昆虫,水生植物。2龄鱼摄食浮游植物及有机碎屑。3.零龄鱼的食性是随着生长过程而变化的。体长30～40毫米以下,主要以浮游动物为食,但能看到体长在接近30～40毫米时为转化期,摄食浮游植物逐渐增多;在体长70毫米以上,几乎完全摄食浮游植物。
The gastric contents of zero-age and 1-tilapia tilapia in the bait and non-bait ponds were investigated and the changes of their feeding habits were analyzed. 1. Feeding the pool of zero-age and 1-year-old fish are feeding artificial food and plankton floating plants. However, the proportion of zooplankton feeding accounts for about 30% of all zoos and less than 2.5% of first-time fish. In addition, the proportion of phytoplankton ingested is affected by the amount of phytoplankton in the water. 2. Without feeding bait, zero-age fish feeding zooplankton, plants, water, terrestrial insects, aquatic plants. 2-year-old fish feeding phytoplankton and organic debris. 3. Feeding habits of zero-age fish change with the growth process. Body length of 30 to 40 mm below the main feeding on zooplankton, but can see the body length of nearly 30 to 40 mm for the conversion period, the gradual increase in feeding phytoplankton; body length of 70 mm, almost completely feeding phytoplankton .