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池塘养殖是我国北方地区淡水养殖的一个主要模式,辽宁地区又是北方乃至全国淡水池塘养殖的一个典范。由于气候和地理位置的限制,养殖模式的主要特点是高投入、高产出、密度大、产量高的精养模式,同南方养殖模式有很大的区别。鱼类的越冬又是北方地区池塘养殖生产的一个重要环节,在黑龙江、吉林、辽宁、内蒙古等地气候寒冷,最低气温达零下30℃以下,有的地方冰封期长达5~6个月,冰层厚度在60~150 cm。因此,鱼类越冬一直是北方养鱼生产中一个极为重要的环节,其成败直接关系到养鱼的经济效益。
Pond culture is a major model of freshwater aquaculture in northern China. Liaoning is another example of freshwater pond culture in the north and the whole country. Due to the limitation of climate and geographical location, the main features of the breeding model are the intensive model with high input, high output, high density and high yield, which is quite different from the model of the South. The overwintering of fish is an important part of pond aquaculture production in northern China. The climate is cold in Heilongjiang, Jilin, Liaoning and Inner Mongolia, with the minimum temperature below minus 30 ° C. In some places, the freezing period lasts for 5-6 months , Ice thickness of 60 ~ 150 cm. Therefore, the overwintering of fish has always been an extremely important link in the production of fish in the north and its success or failure is directly related to the economic benefits of fish farming.