One is the naked eye. Good fry specifications, uniform body color, bright and shiny, robust, smooth and not muddy, swimming and lively; poor fry specifications vary, body color is bleak, individual thin, some body still stained with sludge, Less vitality. The second is the ability to respond. Put the hand or stick into the container of fish fry and disturb the fry. The fry will quickly travel around, and the fry will be unresponsive. The third is the ability to reverse travel. Stir the fry containers and create whirlpools so that the fry can swim against the edges and the poor fry are caught in the whirlpool, unable to resist. Can also let the wind blow or blow the surface with the mouth, so that the fry can swim against the wind, the poor fry can only follow the flow. The fourth is struggling with water. After the water is drained, the good fry will struggle at the pelvic floor, bouncing vigorously, and the head and tail can be bent into a circle. The poor fry is affixed to the pelvic floor and is unable to struggle, only trembling head and tail.
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