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河道网箱养鱼主要特点是箱内外水交换速度快、水溶氧量高、单位体积载鱼量大,对发展网箱养鱼有利,但也给鱼病防治工作带来困难。藤县河道网箱养鱼始于1989年,1992年共有24只1015m~2网箱,以养草鱼为主,占95％以上。笔者经过几年的实践和调查,将常见的河道网箱养鱼鱼病防治技术简述于下: 一、机械损伤和水霉病由于河道网箱养鱼多未配套鱼种网箱,放养鱼种大都来自静水水体,进箱后难以迅速适应流水环境,出现鱼类集群“走边”、“顶水”和不摄食现象,造成鱼种擦伤、体质下降而死亡。机械损伤的死亡率可达10％以上。再者鱼种进箱时水温较低,擦伤后的鱼种易患水霉病,造成鱼种消瘦死亡;若
The main features of river cage fish culture are rapid exchange of water inside and outside the box, high dissolved oxygen, large volume of fish carrying capacity of the cage, but also to the fish disease prevention and control work is difficult. Teng River fish cage network began in 1989, a total of 24 in 1992 a total of 1015m ~ 2 cages, with grass-based fish, accounting for more than 95%. After several years of practice and investigation, the author will be common river cage fish disease prevention and control technology described in the following: First, mechanical damage and watery mildew Due to the river cage fish are not supporting fish cage, fish stocking Most of the species come from still water body. After entering the box, it is difficult to quickly adapt to the flowing water environment. There are fish clusters “walking alongside”, “top water” and non-feeding phenomenon, resulting in bruising and constitutional decline. Mechanical injury mortality rate of up to 10%. In addition, when the fish enters the box, the temperature of the water is lower, and the bruised fish are susceptible to the mold of watery mildew and cause the fish species to die out wasting; if