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First, culture conditions cage culture stingray must reach the following conditions:
1. Meticulously made cages Net cages made of polyethylene, mesh nets are generally required to be 2.0 cm to 3.0 cm, netting nets are 1.5 cm, and cages are suitable for 12 to 24 meters. The shape of the box is square or rectangular. The depth of the box is 2 meters.
2. Reasonably place cages made of bamboo or wooden strips. Place the cages in the frame. Use a cylindrical foam for floats. Use a cobblestone for the sink at the bottom of the cage to allow the cages to rise and fall as the water level rises and falls. . Set the water quality requirements of the cage water area to live cool, high dissolved oxygen. One week before stocking, the cages were placed in water to make the cage wall adhere to algae and reduce fish scrape. The distance between the cages is between 2 and 3 meters. In areas with strong sunlight, shade covers should be placed on the cages.
3. Pay attention to the water quality of the water source. The water source is sufficient and stable without any pollution. Set the water depth of the cage water area to be more than 2.5 meters. To maintain good water quality, the transparency of the water is more than 30 cm, and the exchange volume of the water body is not required.
Second, fish species stocking
1. The source of the fingerlings must be a stingray produced in a regular seedling field. The requirements are uniform, bright color, no injury to the body surface, robust body, lively and lively, and it is better to use artificially propagated fingerlings. Fish species have a high survival rate and are easily domesticated.
2. Restocking Opportunities Net-cultured stingrays generally start to use fingerlings before and after the Spring Festival, when the water temperature is low, and the fish is not easily injured. Fish species need to be soaked with 5% salt water before going down the box to kill parasites and germs.
3. Stocking density Density of caged stingrays is generally between 100 and 150/m. In addition, it is advisable to pick up some head maggots and squama scales in order to fully utilize the bait and purify the water quality of the cages. Stingray grows slowly in the seedling stage and grows faster than 4 cm. It reaches sexual maturity after one year, and the male grows faster than the female. Generally, it reaches 200 g per tail at the end of August.
Third, bait feed Stingray bait feed should pay attention to the following points:
1. Preparation of bait Stingray is a carnivorous fish. The food of stingrays in natural waters is mainly shrimp, fish, fish eggs and some aquatic insects, aquatic plants, etc. Therefore, animal feed can be used for artificial breeding. Feeding. In recent years, self-made bait feed has been adopted for domestication and feeding. The bait used imported fishmeal, meat and bone meal, blood meal, soybean meal, vegetable meal, dried fish and other feed additives to prepare feeds. The protein content in the early stage was more than 34% and the fat was 4%. In the later period, a small amount of fish meal can be used to replace some of the imported fishmeal, with a protein content of 30% and fat of 6%. The feeds must be fresh and free from mildew and rancidity, and full-priced feeds from regular manufacturers should be selected. The feed is preferably in the form of powdered feed. When feeding, the feed is transferred into a paste and placed on the feed table of the cage. Stingrays like to eat soft feed, where conditions permit the fish to be slurried and mixed with powdered feed. Since there is no special feed for stingray on the market at present, it is recommended to use fork fish back feed instead.
2. Domestication and feeding The wild yellow snapper magpies can feed at night, and they can acclimate under artificial culture conditions for 5 days to 7 days. They can feed on the food during the daytime. Two days after the seedlings were put into the box, artificial feeding was used to acclimate them, and a fixed feeding signal was used for acclimation, and fixed-point feeding and timing feed training were conducted. After patience and domestication for 5 days to 7 days. After domesticating the seedlings, they can be fed normally the next day. The feeding method can be artificial and mechanical feeding.
3. Reasonable feeding The entire feeding process should be divided into three stages: the first phase of 5 and 6 months of daily feeding 4 times, the daily feeding rate of 3% to 5%; the second stage of July, August and September. Feeding 3 times, the bait rate was 2% to 3%; the third stage was fed 2 times after October, and the bait rate was 2%. It is advisable to eat the stingray after the specific feeding amount without leaving it. On this basis, the amount of bait should be adjusted according to weather and water quality. In addition, because of the large splitting of the yellow snapper, the particle size of the fish should be increased accordingly. The particle feed with a particle size of 2.0 mm can be used as an open feed. The fish size 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, whereas the use of a floating bait will improve the feed utilization.
IV. Daily management It is very important to strengthen the cage culture of stingrays for daily management. Mainly do the following tasks:
1. Regular inspections should be carried out in the aquaculture. The fish growth should be checked regularly. Careful observation should be performed. Problems should be found in a timely manner. Fish cage culture logs should be prepared to record daily water temperature, feeding, feeding, dead fish and disease.
2. The brush box often scrubs the cage dirt and algae so that the water body can be fully exchanged.
3. Check the box often check the cage, found that the damaged repair in time, so as not to run fish or ferocious fish into the box.
4. As the water level of the reservoir rises and falls, the cage should be adjusted to a suitable depth.
5. Timely catches In order to adjust the breeding density and improve the benefits, it is necessary to start the auction and market it at the right time according to the market conditions and the growth of the fish, so as to maximize the economic benefits. Cage cultured stingrays are generally sold in batches from the beginning of August.
Fifth, fish disease prevention and treatment should pay attention to Huangqi has a strong resistance to disease, as long as the strict control of water quality in accordance with requirements, do a good job of routine disinfection, prevention work, rarely disease. In the event of a disease, it is necessary to make a timely diagnosis, accurate medication, and treatment. Since Astragalus is a fish without scales, it can't endure the use of common drugs as much as home fish. Therefore, it is important to prevent it. Use highly effective and low-toxic drugs as far as possible. It is advisable to regularly feed baits as a preventive method. Monthly use of chloramphenicol, oxytetracycline, etc., and rhubarb, Radix et Rhizoma are given in 0.1% to 0.4% increments for 3 days to 5 days. Or use bleaching powder or copper sulphate and ferrous sulfate mixture (5:2) to hang bags, generally replaced once a week, to avoid damage to the fish body during catching, placing and transportation. In order to prevent the infection of water mold in the early spring and winter cold season.
Cage culture stingray technology
Stingray is a small freshwater fish. Its delicate meat, less thornless scale, delicious taste, rich nutrition, is favored by farmers and consumers, and the market price is relatively high. It is a famous fish with high economic value. At present, the most promising freshwater aquaculture species is one of the most expensive mid-range fish species in the domestic market. The development of cage culture of stingrays in rural lakes, reservoirs, river ditch and other water bodies can effectively utilize water bodies and obtain higher economic benefits. It is an effective way for farmers to adjust their planting structure and increase their income. The relevant technical measures are now described as follows: