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开春后,亲鱼进入产前强化培育阶段。一些鱼苗孵化场往往注重增投青料,补投精料的一方面,而忽视水质的调节和管理。到产前南风一吹,水温回升快,草鱼大量摄食、排泄,加之越冬期间投喂的糠饼、稻谷和麦芽等未完全被摄食而沉积淤泥中。因此,闷热天气极易发生泛池事故,造成惨重损失,功亏一篑。那么,怎样才能搞好亲鱼产前培育阶段的水质调节? 1、正确搭配亲鱼,减少拉网次数。越冬分类时,应根据草、鲢、鳙等亲鱼数量,合理混养,既充分利用水体空间、饵肥资源,又清洁水质,促进性腺发育。同时,减少拉网次数,可避免搅动池底污泥,减少水中大量溶氧损耗。
After the spring, broodstock into the prenatal intensive breeding stage. Some fry hatcheries tend to focus on increasing the cast material, make up the concentrate on the one hand, while ignoring the regulation and management of water quality. To the antebellum southerly winds, the water temperature pick up fast, a large number of grass carp feeding, excretion, combined with winter feeding bran cake, rice and malt, etc. are not fully fed sediment deposition. As a result, the pan-hot weather prone to pan-Chi accident, resulting in heavy losses, fall short. So, how can we improve the quality of broodstock prenatal breeding stage? 1, the correct match broodstock, to reduce the number of nets. Winter classification, should be based on grass, silver carp and other broodstock number, reasonable polyculture, not only make full use of water space, bait resources, but also clean water, promote gonadal development. At the same time, reduce the number of pull the net, to avoid agitation bottom sludge, reduce the amount of dissolved oxygen in water loss.