1. Pond conditions: The intensive production of high-yielding fish ponds requires good water sources, convenient irrigation and drainage, an area of ​​1334-3335 m2 (2-5 mu), water depth of 1.5-2 m, fresh water, rich dissolved oxygen, and less silt in the bottom of the pool. . Static ponds must be equipped with an aerator.
The pool water was drained 7 days prior to seedling release and disinfected with 100 kg fresh lime pond per 667 square meters (1 mu). On the third day, new water was injected, and 901 fish nets were used to kill predators such as blisters and cockroaches and improve the survival rate of stingray seedlings.
2. Fish fry stocking: artificial breeding of yellow sturgeon seedlings in Poyang Lake area, up to 1.5 cm in early June, preferably raised in concrete pool or small earthen pond for 10 days, up to 3 cm in summer flower specifications and then down the pond. During the holding period, they mainly feed red worms and fish larvae, and later feed them with powdered compound feed. The amount of stocking depends on the condition of the pond and the degree of feed protection. Generally, the amount of stocking can reach 5,000-8,000 tails per 667 square meters. Under normal circumstances, after 120-150 days of feeding, the tail weight can reach 100-150 grams of product specifications, and 667 square meters of water surface yields 500-800 kilograms. Stingray is tame and has a weak ability to catch food. It is not suitable for feeding other fish. Starting from the adjustment of water quality and the rational use of natural food, it is necessary to mix large-sized (100 g/above) bream and bream species, with a density of about 667 square meters and about 200, and the mixed fish can produce up to 150 kg.
Before fry stocking, use 3.5% salt solution or 60 mg/L formaldehyde bath to disinfect for 5 minutes to kill surface pathogens and parasites. Due to the high temperature, it is best to carry out the cages out of the color cloth.
3. Feed feeding: Stingray is an omnivorous fish with partial animal feeding. The premise of intensive culture and high yield is to feed a large amount of high-quality feed and achieve scientific feeding. To set up 2-4 food stations, and tame food, so that fish at a fixed time to focus on a fixed spot to eat. Twenty grams before the tail, with fish and powdered compound feed, add water to form a lumps feeding; tail weight 20-50 grams, feeding grain size 1.5 mm, crude protein content of 35% -40% of compound feed (or broken The fish fry stock); tail weight 50 grams or more, to change the particle size of 2.5 mm, crude protein content of about 30% of the compound feed.
During the breeding period, we strictly implement the "four determinants" feeding: the first is the fixed point. The feed should be fed on or near the food table. Do not feed the fish freely or fish. The second is timing. Feed 1/3 of daily bait at 9-10 am, feed 2/3 at 4-5 pm, feed 30 minutes each time, and feed at the “slow, fast, and slow†tempo to avoid nutrient leaching. The third is quantitative. The amount of bait per day is adjusted as the temperature of the water changes and the growth of the fish is adjusted. The daily feeding rate is 3% to 8%. Generally, most of the fish eaten 1 hour after feeding and left the table as a degree. The fourth is qualitative. To ensure that the feed is fresh and not deteriorated, under the premise of reasonable prices, select high-quality feeds with high protein content, balanced nutrition, good palatability, and good stability. Under normal circumstances, the feed coefficient is about 2.5. Wild fish in the Lake District is rich in resources and can be fed with chilled fish to reduce feeding costs.
4. Water quality management: Stingray prefers water and requires the pool to have a dissolved oxygen of 5 mg/l, and no less than 3 mg/l for most of the day. Due to the high density of intensive ponds and the large amount of high-protein feeds, excreta and residues can easily deteriorate the water quality, leading to oxygen-depleted floating heads and even flooding ponds. During the breeding period, on the one hand, we must regularly flush new water and replace old water to ensure that the water quality is fresh, live, tender, and cool. On the other hand, we must rationally use oxygen aerators to make full use of the water aeration, aeration, and oxygen enhancement functions to avoid pool water. Eutrophication results in low dissolved oxygen syndrome.
5. Prevention of fish diseases: Scarlet fish in natural waters are rarely found, but intensive, high-density artificial feeding is prone to outbreaks of bacterial and parasitic diseases. It is an effective preventive measure to diligently wash the food table, remove the residual baits, and disinfect the food table. During the rearing period, regularly disinfect the body of water, such as Quanchiposa 0.3 mg/L strong chlorin or 20 mg/L formaldehyde, 0.7 mg/L copper sulphate and ferrous sulphate, in combination with oral furazolidone (0.5 g/kg feed). , even feed 7 days), have a good preventive effect. If the condition is serious, you can also pull the net and concentrate it with 50-60 mg/L formaldehyde bath for 5 minutes. In addition, the application of 15 kg of lime every 667 square meters every two weeks can not only regulate the water quality, but also prevent the spread of fish disease.
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