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罗非鱼原产于非洲,为热带内陆性鱼类,分类地位属鲈形目丽鲷科。该鱼具有适应高温、高盐度、低溶氧、富营养化及食性广的生态习性,是一种优良的养殖鱼类。但因为其对低温的忍受能力较差,低温临界限仅为12℃,而在信阳地区冬季温度最低可达-11℃,冬季平均温度5℃左右,所以罗非鱼在我区不能越冬。为了解决罗非鱼在我区越冬保种难题,同时提高甲鱼温室的综合利用,我们在2001年冬季采取隔热保温措施(采光温室)和利用井水相结合的方法进行了罗非鱼越冬保种试验,取得理想的养殖效果,现将技术要点总结如下:
Tilapia native to Africa, a tropical inland fish, taxonomic status is Percidae. The fish has to adapt to high temperature, high salinity, low dissolved oxygen, eutrophication and edible wide ecological habits, is a good breeding fish. However, because of its poor tolerance to low temperature, the low temperature limit is only 12 ℃, while in Xinyang winter temperatures as low as -11 ℃, winter average temperature of about 5 ℃, so tilapia in our area can not wintering. In order to solve the problem of tilapia in our region to protect winter overwintering, while improving the comprehensive utilization of soft-shelled turtle greenhouse, we adopted the method of thermal insulation (light greenhouse) and the combination of well water in winter 2001, Kind of test, to obtain the ideal breeding effect, the technical points are summarized as follows: