一看鱼种的规格:同一口鱼池同一种鱼的出塘规格应整齐、均匀,体长、体重相差无几。相反个体差距较大,参差不齐的劣质鱼种,由于抢食、种质混杂、饲养较差等原因,往往造成整体成活率很低。二看鱼种的体色:优质鱼种体色鲜艳而富有光泽。不同的种类、不同饲养方式的鱼种均有着不同? A look at the species of fish species: the same fish pond pond with the same specifications should be neat, uniform, body length, almost the same weight. On the contrary, individuals with large and uneven inferior species often cause low overall survival rate due to snatch, germplasm mixed, poor feeding and other reasons. Second, look at the color of fish species: high-quality fish species bright and shiny body color. Different types, different feeding methods are different species of fish?