南美白对虾有昼伏夜出活动的习性,在养殖过程中,时常会出现一种对虾白天在水体表层游塘的异常现象,有时对虾游塘2￣3d或稍长一段时间后就悄然停止,有时连续游塘长达10￣20d都不停止,有时刚开始游塘不久就出现对虾死亡现象。许多养殖户对此疑惑不解,只好“病”急乱投药,使用药物 Penaeus vaninus has nocturnal activity habit, in the breeding process, there will often be a shrimp during the day in the water surface pond anomaly, and sometimes prawn swimming pond 2 ~ 3d or slightly longer after a period of quietly stopped, Sometimes continuous swimming pool up to 10 ~ 20d do not stop, and sometimes just began to swim pond shrimp death soon. Many farmers puzzled, had to “ill” indiscriminately dosing, the use of drugs