Ao tilapia is a descendant of the hybrid of Oreochromis niloticus and Nile tilapia. It is one of the main economic fish species in China at present. It has strong cold resistance, few diseases, roughage, no intermuscular stasis, and meat quality. The advantages of tenderness, delicious taste, etc., are deeply loved by farmers and consumers. However, the crude technique of A. tilapia fry is another important technology after the success of artificial rearing, and the survival rate of rough standard of fry directly affects the final income of the cultivation of A. tilapia.
Maintain a good water quality environment
In the process of roughing of aureus tilapia, we must maintain a good water quality environment. General water temperature control in 24 °C ~ 28 °C, pH 7.0 ~ 8.0, salinity in 0 ~ 8, dissolved oxygen is greater than 4.0 mg / liter, it is best to maintain 24-hour flow of water cultivation, water body exchange volume of 50% ~ 100%.
Control the stocking density of crude seedlings
Ailanthus tilapia is marked in the concrete tank and its stocking density should be appropriate. The stocking density of fry from 1cm to 1.5cm in length is generally 1500 to 2000/m3. The stocking density of 1.5cm to 2.5cm is generally from 1,000 to 1,500/m3, and the stocking density of fry above 2.5cm should be Controls from 600 to 1000/m3.
Pay attention to the feeding of artificial compound feed
The balanced nutrition of artificial compound feed can well meet the demand of various nutrients in the growth process of fish fry (guarantee that the content of protein in feed is about 35% and fat content is 8%). In the actual aquaculture production, the comparison of the artificially-provided feed and the rotifer for 28 days (density of 1000/m3) on the juvenile finless juvenile A. tilapia shows that artificially formulated feed can be used well Replace traditional rotifers as larval opening feed requirements, and artificial compound feeds have been subjected to high temperature sterilization during the production process, which can greatly reduce the possibility that harmful bacteria and parasite fertilizers are brought into the nursery ponds compared to traditional fertilizing rotifers. ,reduces the possibility of disease.
Daily management
Before laying the fry, the cement pool should be thoroughly disinfected with quick lime 10 kg/mu. After 3 days to 5 days exposure, rinse with clean water to avoid the residue of harmful bacteria. After cleansing, inject 200 mesh filtered water. It is best to clean the pond once a month. When putting the fry, pay attention to the temperature difference before and after the pond water should not be too large.
Because of the difference in growth of fish seedlings from 1.5 cm to 3.5 cm in length, the daily feeding of bait should be paid attention to a small number of times. It is best to feed 4 times/day, 7:00 and 11 respectively. At 00, 14:00, and 18:00, the amount of feed each day is 12% of the body weight; the number of feedings at body lengths of more than 3.5 cm can be reduced to 2 to 3 times per day. When the temperature is high in the summer, the number of feedings can be reduced, and feeding is not less than 2 times a day, that is, once in the morning and once in the afternoon. After each feeding, the remaining bait of the bait station should be promptly removed to maintain good water quality. Ano tilapia has a relatively high nutritional requirement for bait during juvenile fishery. In this period, the artificial compound feed fed can be added in an appropriate amount.
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