Breeding a good stingray, the key is to do a good job of pest control of stingray. From seedlings to adult fishing, they must be carefully managed.
One, seed delivery
Large-size commercial stingrays are welcomed by the market, so large-sized fingerlings of about 30 grams/tail should be stocked for adult fish rearing. The fish stocks can be stocked according to pond conditions, management levels, feed supply and fish species specifications. In general, 30 grams per tail can be given per mus, about 1,500 of the stingrays, and about 200 tails of 50 grams of flowers can be used. The fish species to be placed should be required to have neat specifications, bright color, smooth body surface, no disease, no injuries, no fin defects, and strong physique. Before entering the pool, they must be washed with 5% salt water for 10 minutes.
Second, healthy feeding
1. Feed preparation. The food of the stingrays in natural waters is mainly shrimp, fish and fish eggs, and some aquatic insects, aquatic plants, etc. Therefore, artificial breeding can adopt live animal feed. Domestication and feeding are carried out with self-made foods. Fish meal, meat and bone meal, blood meal, soybean meal, rapeseed meal, dried fish, etc. are combined with feed additives. Protein content is 34% or more and fat is 4% in the early stage; Instead of fishmeal, the protein content is 30% and fat is 6%. The feed must be fresh and free from mildew and rancidity.
2. Feeding and domesticating. Wild yellow sturgeon magpies feed on the night and are domesticated under artificial culture conditions for 5-7 days. They can feed on the bait feeds during the daytime. Two days after the seedlings were introduced into the pond, artificial feeding was used for domestication, and a fixed feeding signal was used for acclimatization to conduct fixed-point and timing feeding training. After patience for domestication for 5 days to 7 days, the domesticated seedlings can be fed normally the next day after entering the pool. The feeding method can be artificial and mechanical feeding.
3. Feeding amount. The entire feeding process should be divided into three phases. The first phase of the 5th and 6th month of the month of feeding 4 times, the daily feeding rate of 3% to 5%. The second phase of the 7th, 8th, and 9th months of daily feeding 3 times, the rate of 2% to 3%. After the third stage, the bait was fed 2 times after October, and the bait rate was 2%. On this basis, the amount of bait should be adjusted according to the weather and water quality conditions. In the first and third stages, it is recommended to use the satiety method, namely the upper bait station. 90% of the fish stopped eating after leaving the station. In the second stage, due to the hot weather and the water quality fluctuates, it is recommended to feed 90% of the satiety, ie 80% of the bait stations, and the fish will stop feeding after leaving the station.
In addition, due to the large split mouth of the yellow snapper, the particle size of the diet should be increased accordingly. The particle size of 2 mm pellets can be used as an open feed and the size of the adult fish can reach 5 mm or more. The use of a hard, hard granular diet requires that the pellets have 15 minutes of stability in water; use of a floating bait will better improve feed utilization.
The stingray grows up to 3 cm in front of the tail, and is mainly eaten by aquatic life. If aquatic life is insufficient, pure cocoon powder can be used instead. After 3 cm, artificial diet feed. In the fishing pond corner, two or more fixed feeders can be set up in the water. The number of feeders can be determined according to the size of the fishing pond and the number of fish. The feeding table can be made of a simple material that can be submerged in water, and a soft material such as a woven bag can be laid on the countertop. When feeding, the powdery food or pellets are added into water and kneaded into small groups of two to three sizes and thrown onto the stage to allow the fish to eat on the table. Feed it once a day in the morning and evening.
Third, water quality management
Water quality management is the most critical factor in the cultivation of adult yellow trout, and it is necessary to maintain a refreshing water environment. For the aging of the water-repellent body, fresh water is injected into the water every month for 30 months in June and June, and the water is changed by 15 centimeters every 6 months from June to September to maintain the water depth at 1.2 to 1.5 meters. Adhere to the use of quick lime every month from June to September to splash water once to purify and disinfect water and reduce organic suspended solids. Five kilograms of quicklime (or 2 kilograms of bleach) was applied locally at the food farm and aerator every half month. Observe the concentration of algae and algae in the water body, adjust the water body fertilizer according to the inorganic color fertilizer (urea, superphosphate, potassium dihydrogen phosphate, etc.), and maintain the transparency in 30~35 cm; according to the determination of dissolved oxygen and weather and water quality Scientific use of aerators, sunny days to adhere to the early morning and afternoon boot for 1 hour, rainy, hot weather to make full use of mechanical oxygen to supplement the body of dissolved oxygen, dissolved oxygen should be maintained at 3 mg / ml or more.
Fourth, drug selection
1. Insecticides. For each cubic meter of water, use a 0.03 PPM concentration of the enemy-killed Quan Quan to sputter, or sprinkle with sulphate and ferrous sulfate at a concentration of 0.15 ∶ 0.05 PPM. The insecticides used for the above insecticides (such as ringworms and worms) are better, but the two drugs can only be used singly, and they cannot be used together or alternately, and they cannot be overdosed.
2. Antibacterial and anti-inflammatory agents. Oral penicillin capsules can be used, feed (5 g) in the feed for 3 consecutive days, 2 times a day, and the fish body is sterilized with 0.25% bleach or penicillin for 10 minutes. The above oral medicine, the best is now with the feed, with a feed for 3 days, avoid long put. The diseased fish mainly targets bacterial infections.
3. Treatment of bleeding disorders. With raw salt 50 kg/mu, the whole pond is splashed. Treatment of stingray fish disease should refuse to use trichlorfon to kill insects, otherwise it will have adverse consequences.
In the launching and transportation, as far as possible to avoid damage to the fish, to prevent the early spring, autumn and winter cold season infection of water mold. In the hot season, if hemorrhagic edema disease occurs, continuous use of nitrogen dioxide in the whole pool should be used to effectively treat 2 times.
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