银川地区小型湖沼特多,可拓为养鱼基地,发展池塘精养。这里冬季寒冷,冰期长达4个月,适宜偏低温水性鱼类生长的水温≥20℃的时间仅约100～110天。但光能条件较好,年平均日照时数3000小时,年辐射热量148大卡/厘米~2。塘养鱼产量长期来低而 Small lake in Yinchuan Trinidad and Tobago, extension of fish farming base, the development of intensive pond. Here, the winter is cold and the ice age is up to 4 months. The water temperature suitable for the growth of partial low-temperature water-based fish is only about 100-110 days when the temperature is ≥20 ℃. However, the light energy conditions are good, the average annual sunshine hours 3000 hours, the annual radiant heat 148 calories / cm ~ 2. Pond fish production has long been low