Commercial breeding pattern of yellow sturgeon
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I. Pond conditions The pond area of ​​cultivated commercial stingrays is not strict, and may vary, but the water depth should be kept above 1.5 meters. The silt in the bottom of the pool should not be too thick, and the sandy bottom is better. The pond requires convenient irrigation and drainage, and the amount of water is sufficient. The fish ponds were treated with clear lime before clearing the pond. The amount of lime used in a single pond was 75-90 kilograms per 667m2 (1 mu) to thoroughly remove wild fish and kill pathogenic organisms.
Second, the stocking method
1. The main cultivating pond mainly raises stingrays. The size of the fingerlings is 10 to 15 cm, and the weight is 15 to 35 g. It is recommended that each 667 m 2 volume is about 2500 to 5000, and each of the rearing fins and the squid has 100 tails. To control water quality. The feed is fed on the basis of 1% to 4% of the fish's body weight to feed the full-price compound feed, or to feed small fish and shrimp that account for about 10% of the body weight.
Formulated artificial feed can be formulated with reference to the following formulas: fish meal 30% to 40%, vegetable cake 10% to 35%, bean cake 20% to 30%, secondary powder 15% to 18%, rice bran 10% to 15%, Lures promote long additives 2% to 5%. About 1 kg of fish need about 2 kg of feed, feed costs about 8 yuan.
Since stingrays are carnivorous fish, the quality of artificial feed must not be too bad, otherwise growth will be hindered. The seedlings that are already tamed can be directly fed and ready to eat, and the natural seedlings must be tamed for about 1 week before they can consume artificial feed.
Taming method is first used to throw fish along the edge of the pool, 1 to 2 days after the start of feeding the fish to gradually add artificial bait stir into the fish in the fixed point voted at the water, and finally turn to all artificial feed for fixed-point, timing Quantitative feeding.
2. The polyculture of stingrays is raised in other aquariums. You can use some wild fish and shrimp in the pool instead of feed stingrays. Each 667 m 2 put 50 to 100 tails in 35 g or so. The fish species can also get 10 to 15 kilograms of commercial stingrays. However, stocking specifications should not be too small, and it is not advisable to raise ferocious carnivorous fish in the pool, such as large oystercatchers and black oystercatchers.
Third, water quality management Stingray than conventional fish intolerance of low oxygen, like clean water, so the culture of stingray pond water transparency should be maintained at 35 to 40 cm, high density aquaculture ponds should be set up to prevent oxygen deficiency floating head. Add new water regularly. Stingray pond water should not be too alkaline, and the amount of quick lime used for disease prevention should not exceed 20 g/m3 water.
Fourth, fish disease prevention and treatment of stingray has a good ability to resist disease, good water quality, rapid growth of feed foot, good physical condition, not easy to disease. At the same time, some crustacean parasites have a certain degree of inhibition and elimination. It can eliminate other fish head rash disease, but it is more sensitive to trichlorfon, deltamethrin and other pesticides, ponds with stingray should not use such pesticides. Tolerances such as copper sulfate are similar to those of conventional fish. Common diseases in culture are cutworm disease and enteritis and nematode disease, and a few ciliate diseases. Most of the carrion disease is caused by poor water quality and fish body injuries. Enteritis is caused by feeding unclean bait and is less common when feeding whole-priced compound feed. Control measures: Thoroughly clear the pond and remove excess silt. When the fishes are pooled, 1 g/m3 of malachite green or 25 ml/m3 of formalin may be used for bathing for 30 to 50 minutes before going down the pool. After the next half of the pool, use quicklime at 15 g/m3 or bleach. 0.8g/m3 of the whole pool of sprinkling of water, chlorine dioxide mixture can also be used for regular disinfection. In addition to the use of disinfectants, enteritis should stop feeding unclean baits. At the same time feeding the bait, when feeding the first amount of the original feed 1/2, after the bait accounted for 1/3 of the original amount of feed, for every 100 kg of baits can add 15 grams of oxytetracycline or norfloxacin. Once a day, for 3 to 5 days. At the same time, the fish out of the group will be singled out and have serious illness. Add fresh water daily to keep the pond full of oxygen.