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怀安县气候虽较寒冷,但经测定全年有134天水温在15℃以上,5月份水温为16～24℃,6月份21～25℃,7月份24～30℃,8月份23～28℃,9月份13～22℃,据此水温,养殖罗非鱼的生长期最少需要120天。1.池塘条件 1991年,试验池塘8个,共计63亩,平均水深2.3m。1992年,试验池塘10个,共计90亩,平均水深2.5m。两年都设有大小一样的对照池塘。2.鱼种放养 两年的鱼种都从阳原县澡洗塘村引进,两年的
The weather in Huaian County is relatively cold, but it is determined that the water temperature of 134 days is above 15 ℃ throughout the year. The water temperature in May is 16-24 ℃, in June it is 21-25 ℃, in July it is 24-30 ℃, in August it is 23-28 ℃ , September 13 ~ 22 ℃, according to the water temperature, breeding tilapia growth period of at least 120 days. 1. Pond conditions In 1991, there were 8 experimental ponds with a total area of 63 mu and an average depth of 2.3 m. In 1992, there were 10 pilot ponds with a total area of 90 mu and an average depth of 2.5 m. Both years have the same size control pond. 2 species of fish stocking for two years from the Yang County, wash wash Tong Village introduced two years