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鱼苗池中有几种水生动物和藻类对鱼苗危害很大,应根据不同对象采用相应的防治措施,以保障鱼苗正常生长。 1.龙虾 系一种分布广、繁殖快的杂食性虾类,在鱼苗池中大量繁殖时对鱼苗危害特别大,既伤害鱼苗又大量吞食鱼苗。防治方法是:①生石灰清塘,以水深1米计,每667平方米水面用生石
There are several aquatic animals in fry ponds and algae on the fry a great harm, should be based on different objects using the appropriate control measures to ensure the normal growth of fry. 1. Lobster is a widely distributed, fast-breeding omnivorous shrimp, fish ponds in large numbers when the proliferation of fish fry particularly harmful, both fish fry damage and swallow a large number of fry. Prevention and control methods are: ① clear lime pond, with a depth of 1 meter, every 667 square meters of water with stone