After 1-2 weeks, when the juveniles grow to more than 1 cm, the swimming ability is also enhanced, and fish feed or palatable artificial diet can be fed. When juveniles grow to 1-2 cm in length, the naked eye can distinguish between single, double, or incomplete caudal fins. The first choice should be based on the shape of the caudal fins at the right time, leaving a double tail fin, removing single tails and two tails. With the continuous growth of the fish, the dorsal fin has clearly distinguished the dragon back, the stump, etc., and it is necessary to make a second choice. In the literary family with dorsal fins, the dorsal fins were selected and the fins were not incomplete; in the egg family without dorsal fins, the backs were selected to be flat, smooth, without fins, and without protrusions. Drop it. In the future, according to the characteristics of its species, continue to select the traits of caudal fins, dorsal fins, body shapes, eyes, scales, blisters, pompoms, high heads, tiger heads, and colors in stages. That is, adjust the density of stocking once. The good ornamental goldfish that are sold in the city are generally the finished products left after four or five selections. Our predecessors have also accumulated rich experience in this area: “Because the time is too large, we have to choose from thousands of talents, choose thousands from thousands, select thousands from thousands, and produce ten from hundreds of miles. The Good One" (The Old Man of Yu Yuan 1904, "The Collection of Worm Fish," page 14). As for the species of fish left for wintering, strict selection must be made, and the best ones should be reserved for species use. "For the sake of goodness, there is a good thing in the old fish, and it must be good." ("The Collection of Worms," ​​page 18).
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