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春季成功的投放鱼种是保证全年池塘安全生产的关键。由于受地域和气候影响 ,乐都地区春季投放的鱼种主要来源于外省市 ,运输困难 ,成活率低。对此乐都县在 1 999— 2 0 0 0年进行实践 ,掌握了春季投放鱼种的关键技术 ,成活率达 90 %— 95% ,较往年提高了 5—1 0个百分点。1 鱼
The successful delivery of fish species in spring is the key to ensure the safe production of ponds throughout the year. Due to the influence of the region and the climate, the fish species put into the spring in Ledu mainly come from other provinces and cities, so the transportation is difficult and the survival rate is low. In this regard, Ledu County conducted its practice in 1999-20000 and mastered the key technologies of fish breeding in spring, with a survival rate of 90% -95%, an increase of 5-1% over the previous year. 1 fish