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Second, look at the group composed of good fry size, body plump, smooth without dragging mud, swimming and lively; poor fry body size, ranging in size, the body dragging mud.
Three to see the ability to move hand or wooden stick into the seedling bowl, seedling plate middle, frightened fry, good fry quickly traveled around; poor fry is unresponsive.
Fourth, look at the counter-water flow and stir the fish body with a hand or a wooden stick to make the water whirlpool. The good fry can swim against the water along the edge; the poor fry is caught in the whirlpool and is unable to struggle. If the fish fry in the white porcelain basin, let the wind blow the water, so that the fry can swim against the wind; poor fry can not.
Five to see the ability to struggle to break the fry into a white porcelain plate and drain the water. The good fish fry will be struggling, and the head and tail will be bent into a round shape. The poor fry will not be able to struggle, only shaking head and tail.
Buy fish fry
A look at the good body color of the fish fry is the same, and the body color is fresh; the poor fry population has different pigments and the body color is slightly white.