一看鱼种规格同一鱼池同种鱼的出塘规格应整齐、均匀。个体差异较大、参差不齐的劣质鱼种,一般多因抢食、种质混杂、饲养较差等原因所致,这类劣质鱼种的成活率很低。二看鱼种体色优质鱼种体色鲜艳而富有光泽。优质鲢鱼种背部应为银灰色,体侧和腹部为银白色;优质草鱼种体色为淡金黄色,灰黑色的网纹状鳞片比较明显;优质鳙鱼种体色大多为淡金黄,全身黑色斑纹不十 A look at the specifications of the same species of fish pond fish out of the specifications should be neat, uniform. Inferior species of individuals, uneven species of poor quality, usually due to snatch, germplasm mixed, poor feeding and other reasons, the survival rate of such poor quality species is very low. Second, look at the species of fish species of high quality color and bright color of fish body color. High quality silver carp species back should be silver gray, body and abdomen silver white; quality grass carp species pale gold yellow, gray and black reticulate scales more obvious; quality mullet species mostly pale yellow body color, the whole body Black stripes are not ten