After the broodstock is selected, the gonads must be bred to make the gonads mature before they can be artificially propagated. Broodstock breeding can be done in cement ponds or in ponds.
1. Cement pond cultivation
Cement pool area is generally within 100 square meters, mostly 20-30 square meters, water depth 60-80 centimeters, 15 to 20 broodstock per square meter stocking. The male and female pools can be fed with compound feeds such as moon cakes, clams, and shrimps, as well as artificial feeds such as cocoons and fish, and fed twice daily (9 and 16-17 hours). The amount of feeding depends on the change in water temperature. In Guangdong and Guangxi, from December to January, the daily feeding amount can be 1% to 2% of the fish's body weight, and it can gradually increase to 5% with the increase of water temperature from February to February. During the broodstock breeding period, attention should be paid to keeping the water clean. Trichloroisocyanuric acid (0.3-0.4 mg/l) may be splashed once every 2-3 weeks to disinfect the fish pond to prevent the occurrence and epidemic of the disease. The transparency of pool water should be controlled at about 35 centimeters. When the fertilizer is developed, the water should be changed in time. Each time the amount of water is changed is 1/3-1/2 of the original pool water, which is conducive to the development of fish gonads. In addition, it is easy to jump out of the pond at night, and a moon about 60 grams in weight can jump more than 60 centimeters from the water surface. Therefore, a mesh fence should be used around the broodstock pond to prevent escape.
2, pond cultivation
The broodstock area is 100-1200 square meters, the water depth is 50-100 centimeters, fish is 5-10 fishes per square meter, and the male and female pools are kept. During the cultivation period, the water temperature should be maintained above 16°C, the pool water should be cleaned to avoid deterioration of the water quality or lack of oxygen, and the high protein feed should be used for feeding. The daily feeding amount should be 3%-4% of the fish's body weight and should not be fed too high. Fatty material, so as not to affect the development of gonadal due to excessive fat in the fish body. When the water temperature is above 18 °C, preferably 22-25 °C, you can choose the abdomen expansion, relaxation of reproductive holes, good maturity of the female and light pressure abdomen with orange male semen out of the male as a parent breeding.
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