Pond culture
(1) The conditions and requirements for aquaculture ponds, the area of ​​adult ponds is generally 5-10 mu, preferably 3-5 mu, the water depth is 1.5-2.5m, and the best soil is sandy loam, dissolved oxygen should not be less than 6.5 Mg/l, ammonia concentration ≤ 0.3 mg/l, pH 7.5-8.5.
(2) Prepare before stocking, sterilize and replenish the shrimp ponds according to the general specifications of marine aquaculture, and fertilize the new water in 7-10 days prior to planting. Pre-drainage is generally 70-80cm to increase water temperature quickly.
(3) Fish stocking specifications and density, general specifications for the tail weight 1.9-4.3g. Stocking density is 1500/mu.
(4) Cultivation period management, regular inspections of fish ponds to strictly control water quality, and finding problems in time to take measures; control of daily investment volume, generally 2-5% feeding of fish. Generally, it is fed twice a day, once in the morning from 8-9 am, and once in the afternoon from 3-4 pm; it should be fed regularly, regularly, and quantitatively; pay attention to the discharge of pool water, and the water level should be maintained at about 2 meters, and the daily water exchange volume should be 20 %; Pay attention to fish pond hygiene and disease prevention, timely clean the poolside and pond weeds, macro algae and feed residue, regularly feed medicines to prevent disease, find out the cause of the disease in time, and take corresponding measures; make regular inspections to make records .
Cage culture
(1) Stocking specifications and density. Redfish cage culture can be divided into two types. One is the middle cultivation stage of seedling sea cages; the other is cultivation stage. The stocking specifications for the mid-cultivation stage of seedlings are preferably 2.5 cm in length. At 23-28°C, about 30-40 days, it can grow to about 6cm. The maximum stocking density is 1500/m3. In the growing stage, the length of 6cm fish is 60-100. M3, preferably 20-30/m3.
(2) Daily management of cages. Safety inspection, prevent fish escape, check the safety of the cage regularly in the process of cage culture; ensure no fish escape, keep a good record of feeding, including fish activity and feeding conditions, water temperature measurement, salinity measurement, death , weather changes, fish growth (measured once every 10-15 days), cage destruction and repair.
(3) Removal of cage attachments. The attachments to cages are mainly algae, bryozoans, sponges, ascidians, and sediments. Remove these attachments, you can use hand-washing, it is best to use water guns, submersible pumps with strong water to wash the cage on the dirt. It is not enough to change the cage.
Feeding. There are two types of feeds: small trash fish and compound feed. When feeding small trash, it is necessary to ensure its freshness. Daily feeding amount is 2-5% of the fish's body weight and it is fed twice a day.
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