稻田养鱼,省工省肥,成本低,效益好。但因技术跟不上,推广工作受到影响。笔者在实践中了解到,有五个问题必须注意: 一、鱼种规格要适度。不少养鱼户反映,亩投鱼种数量不少,成活率都不高,主要原因是鱼种规格过小,投后易被鼠、蛙、鸟捕食。投放的鱼苗,以15—20厘米为宜。二、密度要合理。有的只想多产鱼,不顾水深和水质肥瘦,造成鱼体生长缓慢,鱼体过小,产量还是上不来。在一般情况下,亩投鱼种1000—1500尾为宜,如果套养鱼种,亩平不得超过10公斤。 Paddy fish farming, provincial labor and fertilizer, low cost, good efficiency. But because technology can not keep up, promotion work is affected. I learned in practice, there are five issues must be noted: First, the species should be moderately sized. Many fish farmers report that there are many species of fish that are not cultivated and the survival rate is not high. The main reason for this is that the fish species are too small to be preyed upon by rats, frogs and birds. Put fry to 15-20 cm is appropriate. Second, the density should be reasonable. Some just want to fish more, regardless of water depth and fat, resulting in slow growth of fish, the fish is too small, the output is still up. Under normal circumstances, acres of fish species 1000-1500 tail is appropriate, if the set of fish species, mu flat no more than 10 kg.