山区鱼塘多为土池 ,建池经济 ,复耕快 ,又可改善土壤养份结构 ,但多年养殖造成池塘淤泥过深 ,水位较浅 ,相对放养密度增大 ,水质偏肥 ,有机质含量高 ,池水呈酸性 ,(p H值在 5～ 6之间 )有利于卵甲藻大量繁殖 ,我县鱼种场于 1998年出现嗜酸卵甲藻危害 ,病鱼死亡率较高 ,造成损失 Most fish ponds in mountainous area are earth ponds, which have the advantages of economy of economy and rapid re-farming, and can improve soil nutrient structure. However, the ponds have been over-cultured for many years and have shallow ponds, relative stocking density, partial water quality, high organic matter content, Water pool was acidic (p H values ​​between 5 and 6) is conducive to the large number of oocysts multiplication, my county fish market in 1998, Eosinophilia ova damage, sick fish higher mortality, resulting in loss