California New Technology of Catfish Breeding

California salmon is a species of oystercatcher, and it is native to California and introduced to China in the early 1980s. The California salmon carp pond culture and cage culture technologies are introduced as follows: I. Pond farming California farming squid technology 1. Pond conditions. Feed California catfish, suitable breeding area is 2-3 mu, water depth is 1.5-2.0 meters, there is no less seepage sludge, abundant water source, fresh water, high dissolved oxygen, convenient water injection and drainage, etc. Liquor and other drugs must be used before stocking. Thorough clear pond disinfection, quicklime consumption of 75-100 kg per mu, clear pond, put 150-200 kg of organic fertilizer per acre for the base fertilizer, a large number of natural food for breeding fish feed. Fish stocking. California salmon rearing time is controlled in the middle or late April. When the water temperature reaches 180C or above, it can be stocked. The stocking size is 4-5 cm in summer. The species is more suitable for breeding, and the specifications strive to be neat, avoiding large differences in size, and can reduce or Avoid big fish eating fish. Stocking densities depend on the pond water quality, feed, technical management, and planned production. Adequate animal feed, fresh, good pond water quality, more appropriate amount of acre stocking, general stocking number of 1000-1500 per acre, while taking a small amount of carp, carp, carp, and tilapia to stabilize and Improve water quality. 3. Feeding method. General feeding methods are similar to home fish. California catfish are greedy for greed, have a large food intake and grow fast. River fleas, snails, loach, cockroaches, small fish and shrimp, fresh livestock and other animal viscera are good animal diets, and can also be fed artificially prepared feed. However, the crude protein content is required to be above 35%. The best process for feeding is to formulate a group of viscous feed into the food table to avoid waste of feed and deterioration of water quality. The bait is an important factor that determines the growth and quality of California salmon, so it is necessary to feed the bait from the day of stocking. In the early period of feeding, fresh and live baits are mainly fed, and the protein content in the bait should be appropriately higher. The main fish fry (white peony, eel fry, etc.), fish paste, leeches, and red worms are mainly daily mornings. In the afternoon and evening feeding, the amount of bait is 8%-10% of the fish's body weight. As the fish grows and the food intake increases, the amount of feed can be increased, and the feed can also be gradually transferred to fresh animal feed (such as fresh wild fish, snail meat, poultry, etc.) or artificial compound feed. At present, the feed for California salmon is mainly in the following categories: 1) catfish feed; 2) stir-fried mash into a suitable amount of peanut bran, Corn flour, etc.; 3) fish meal 60%, fourth flour, and yeast flour 40% of the formulated mixed feed, daily feed is 3-5%, adjust the feed once a week or half a month, once every morning and afternoon, usually at 8:30-9:00 am and 4:00 pm - 5:00 feeding. 4. Daily management. Because of the high density of stocking California salmon, the management of the breeding process must be strengthened. The first step is to prevent oxygen deprivation. Therefore, the pond must be equipped with an aerator to allow morning and evening patrols. Before the weather is hot and thunderstorms, it is necessary to start up or raise a new one. water. Secondly, breeding for two months or so must be conducted in separate ponds in order to increase the survival rate and increase the yield. In addition, there must be escape facilities at the inlet and outlet to prevent California salmon from fleeing. Second, cage breeding 1. Water area selection. Choose sheltered winds, wide water surface, good sunshine conditions, long-term water depth of not less than 2.5 meters, water pollution-free, quiet environment, non-traffic arteries, deepwater oxygen storage tanks above 5 mg / liter. 2. Cages specifications, structure and settings. Breeding California catfish cage specifications, fish seed box mesh 0.8-1.2 cm, adult fish box 2-3 cm, cage area 8-20 m2. The structure of the cage is a floating frame and the frame is fenced with bamboo. The cages were arranged in "goods" arrangement, the distance between the two rows was 1-2 meters, and the box distance was 0.6-1 meters. 3. Fish stocking. Before the fish is put into the box, the cage should be placed in the water for 10-15 days to make the box smooth. Restock the disease-free, non-injury, healthy and tidy fish species. The summer flower of 300-500 tails/m2 is stocked, and the one-year-old fish species is 15-20 tails/m2. 4. Feeding management and feeding. The daily feeding rate of summer fish species is 8-10%, and the daily feeding rate of one-year species is 3-5%. One-year-old fish feeding fish should be moderate in size. Feeding times, California salmon species are fed 3 times a day, ie, once in the morning, midnight, and evening; adult fish are fed 2 times a day, once in the morning at 8-9 am, and then again at 3-4 pm. Feed it once. To do every morning, evening and midnight inspections, one is to check whether the feed fish in the cage is finished eating, and remove the dead fish in the cage in time; prevent water mice from feeding on the bite-breaking cage; second, check the cage Whether damaged, and often cleaning cage attachments; Third, check the river fluctuations, timely adjustment of cages. 5. Adult fish sales. When the specifications have reached 400 grams/tail, they can be caught and listed. Retainable cages that do not meet the marketing specifications will continue to be raised. However, the maximum size of retained fish may not exceed 650 g per tail. Third, to prevent fish disease and regulate water temperature California carp strong disease resistance, generally not the incidence. However, at the stage of fingerlings, it is easy to infect hydromycosis and parasitism by trichomonads, slugs and other protozoa, and cause death in severe cases. Fish species must be soaked with salt or methylene blue for about 5 minutes before stocking. Protozoan parasitism can be sprayed with 0.7 mg/L CuSO4 and ferrous sulfate (5:2) mixture. If you are infected with watery mildew, you can use 0.1-0.2 mg/L malachite green or 0.5-1% saline bathed fish to treat. When it is found that pool water is too fat and water quality deteriorates, lime is splashed properly. The limit temperature for surviving California salmon is 2°C and 35°C at the lowest. Therefore, we must pay attention to the prevention of heatstroke during the summer and thermal insulation during the winter. We must raise the water level of the pond in winter and summer to keep the water temperature suitable and the conditional pond in winter. Warm water can be properly injected to normal food intake.

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