Cultivation techniques of American red fish

Pond culture

The main results are as follows: (1) according to the conditions and requirements of culture ponds, the area of adult fish ponds is generally 5-10 mu, the best is 3-5 mu, the suitable water depth is 1.5-2.5m, the best soil quality is sandy loam, the dissolved oxygen should not be lower than 6.5mg/l, and the pH value of ammonia concentration ≤ 0.3mg.

(2) for the preparation before stocking, the shrimp ponds should be renovated and disinfected according to the general specifications of mariculture, and fresh water should be infused. Fertilizers should be applied to cultivate water quality 7-10 days before stocking, and 70-80cm should be released in the early stage, so as to increase the water temperature quickly.

(3) the stocking specification and density of fish fingerling, the general specification is tail weight 1.9-4.3 g. The stocking density is 1500 tails / mu.

(4) Management during the cultivation period, regularly inspect fish ponds to strictly control water quality, take timely measures when problems are found, and control daily investment volume, usually 2-5% of fish body weight. Generally, feed twice a day, 8-9 am, 3-4 pm; fixed-point, regular and quantitative feeding; pay attention to the drainage of the pool water, the water level should be kept at about 2m, and the daily water exchange capacity is 20%; pay attention to the hygiene and disease prevention of fish ponds, clean up weeds, macroalgae and feed residues on the edge of the pond and in the pond in time, regularly feed drugs to prevent diseases, find out the causes of diseases in time, and take corresponding measures Check regularly and make records.

Cage culture

(1) the specification and density of stocking. The cage culture of red fish can be divided into two types, one is the middle cultivation stage of the marine cage, and the other is the cultivation stage. The best stocking specification in the middle stage of seedling cultivation is 2.5 cm in body length. Under the condition of 23-28 ℃, it can grow to about 6 cm in about 30-40 days, and the maximum stocking density is 1500 fish / m3. In the breeding stage, the density of fish species with a body length of 6 cm is 60-100 fish / m3, preferably 20-30 fish / m3.

(2) daily management of cages. Safety inspection, strict prevention of escaping fish, often check the safety of the cage in the process of cage culture; ensure that the fish do not escape, keep a good feeding record, including the activity and feeding of the fish, water temperature measurement, salinity measurement, death, weather changes, fish growth (measured every 10-15 days), cage damage and repair.

(3) removal of cage attachments. The attachments of the cage are mainly algae, bryozoans, sponges, sea squirts and sediment. To remove these attachments, you can wash them by hand, preferably with a water spray gun and a submersible pump to wash down the dirt on the cage with a strong current. I really can't. I have to change the cage.

Bait. There are mainly two kinds of feed: small miscellaneous fish and compound feed. When throwing small miscellaneous fish, it is necessary to ensure its freshness. The daily feeding amount is 2-5% of the body weight of fish, and it is fed twice a day.

Disease control of American red fish

Because American red fish was introduced for a short time, some diseases specifically aimed at American red fish have not been found, so there are few studies, which is one of the reasons why American red fish is easy to raise.