可封闭流水式网箱养殖效果分析

为实现健康养殖和最大限度地提高单位水体产量及质量,研发了可封闭流水式网箱,该网箱基于封闭网箱,在网箱上开换水窗口,用防水拉链控制网箱封闭与开放,内衬网衣,运用水泵及管路设计不同水交换模式控制水质,并集成集污排污设备,能够防治病害等。网箱在2011年9月于福建省尤溪县街面水库经过100 d的罗非鱼养殖试验,定期对4个采用不同养殖方法的网箱检测水质,发现其在封闭养殖状态下含氧量平均6.158 mg/L,氨氮和亚硝氮含量平均为0.291 mg/L和0.011 mg/L。结果表明网箱能够在表层水环境污染情况下保证水产品成活率,能够集污排污,实现网箱低污染养殖。

Effect Analysis of Closed Cage on Breeding

In order to realize healthy culture and improve waterbody yield and quality by the largest extent, this paper studied and developedes a closed cage to running water type. The closed cage has window (hole) on the wall, which can be opened for changing water. The holes could be closed or opened by waterproof zippers. The closed cage was installed on cement floating body, and 2 pumps were used to provide circulating water thus improving flesh quality while removing fecal matter and unconsumed feed. This closed cage could prevent and control diseases. Waste material is recycled for compost. The closed cage was tested in street reservoir of Youxi County in Fujian Province in September 2011. The test was conducted by breeding tilapia for 100 d, and the water quality was tested regularly in 4 closed cages with different cultivation methods. Under the closed cultivation conditions, the oxygen levels was 6.158 mg/L, ammonia nitrogen and nitrate nitrogen contents were 0.291 mg/L and 0.011 mg/L on average. The results showed that the new closed cage could ensure the survival rate of aquatic products in the case of surface water pollution, recycle the waste, and realize pollution-free cage farming.