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一般人工养殖的商品黄鳝到春节前后销售,小黄鳝则在第二年才能养成。网箱中养殖的黄鳝在冬季冬眠时常有死亡,给养殖者造成较大的经济损失。笔者对多年的养殖实践进行总结,认为网箱黄鳝越冬死亡有多种原因,并可采取相应的措施预防。1.体质太差:由于黄鳝自身体质太差,对环境变化特别是水温剧变和病害的抗逆力差而造成死亡。因此,从越冬前的秋季开始就必须加强饲养管理,以增强黄鳝自身体质。主要措施是:投喂含丰富蛋白质和一定量脂肪的能量饲料,如蚯蚓、螺蚌肉、鲜鱼、蝇蛆、全价配合饲料等;增加投喂次数,由原来每
General artificial breeding eel before and after the Spring Festival sales, small eels in the second year to develop. Cages eel farming in the winter hibernation are often dead, resulting in greater economic losses to farmers. The author summarizes many years of farming practice, that the cage eel overwinter for a variety of reasons, and can take appropriate measures to prevent. 1. Constitution is too poor: Due to poor physical constitution of the eel, it causes death due to the environmental changes, especially the drastic changes of the water temperature and the poor resistance of the disease. Therefore, from the beginning of winter before the fall, we must strengthen the feeding and management, in order to enhance the eel’s own constitution. The main measures are: feeding energy-rich feedstuff containing abundant protein and certain amount of fat, such as earthworm, snail clam meat, fresh fish, fly maggots, full-price combined feed, etc .; increasing feeding frequency,