Cod fish breeding technology

Pond conditions: General culture ponds can be used to culture rouge fish. In the process of breeding fish roach, it is required that the water source is sufficient and the water quality is fresh; it is better to have mechanical equipment such as oxygenation and irrigation.

(II) Stocking of fish species

Fish stocking should be completed by March. The size of stocking fish species is 10~15 tails/kg; and the size of fish stocks in the same pool should be as uniform as possible. The stocking method is implemented by the ground and due to the pond, which can be single-cultivated, or it can be mixed and raised. For single-breeding, 800 to 1200 fishes are stocked per acre, with 50 to 80 tail fishes and a small amount of grass carp and carp. Also depending on the situation, 800-1000 squid summer flowers (about 3 cm) are reared. In polyculture, other fish (generally grass carp, white pelicans, squid, etc.) are used as the main fish, and the squid fish is used as a bottom layer to match fish, and about 200 pupa fish species can be stocked per mu of water. Because of its mild nature, camp benthic and meat-eating properties, it is not recommended to breed polyculture with cockroaches, cockroaches or other ferocious meat-eating fish.

(three) bait and feeding

Adult fish fed with artificial feed can be formulated. However, it is more cost-effective to go directly to the manufacturers or sellers, and the breeding effect is also ideal.

The rouge has feeding behavior throughout the year, but the intensity of feeding is different in different seasons. Therefore, according to this feature, we have different daily feeding rates in different seasons. In general, the feed intake in April and May is 3% to 4% in weight, 5% to 8% in June to August, 3% to 5% in September to October, and 1% to 2% in November and December. 1 to 3 months, a small amount of feeding. In the actual breeding, the daily feeding amount should also be based on the weather, water temperature, dissolved oxygen, and pond fish feeding conditions, etc.; in accordance with the "Four Sets" principle, ensure that the fish to eat well, eat well, eat full.

(D) daily management

1. Patrol pond

Take a patrol of the pond three times a day to observe changes in the fish’s feeding, activities, and pool water; check the intake and drainage facilities, especially at times of severe weather and storms, and step up inspections to identify problems and deal with them in time. Wash the bait station frequently to remove the residue and dirt from the water in a timely manner to prevent water pollution.

2. Water Quality Management

Water quality management is a central part of day-to-day management. Rouge fish live in fresh water and require high dissolved oxygen. Therefore, we must strengthen water quality management in particular. Change the water frequently, under normal circumstances, a small change every week, change the new water l/3; half a month change, change water 2/3. As the fish grows and the water quality gradually increases, the number of water changes should be appropriately increased. During the hot season, the water should be changed every day, and the oxygen aerator should be started regularly to keep the pool rich in water-soluble oxygen with a transparency of 40 cm or more. This can promote the appetite of fish and reduce the incidence of disease. In addition, farmers regularly sprinkle lime, bleach and other antiseptic drugs to regulate the water body, they may also apply to the pond photosynthetic bacteria, EM bacteria liquid and other modifiers, which is to improve the bottom of the pond oxygen supply and improve the water environment is very effective.

The common diseases of rouge fish are: gill disease, enteritis disease and malnutrition, pan pool and parasitic diseases.

(1) Gill rot occurs in both adult and juvenile fishes. Because of the colony habits of the rouge fish, once the disease occurs, it quickly infects, sometimes leading to a large number of dead fish. Control methods: First, a large number of water injection to improve the water quality of the pond; Second, the fish ponds thoroughly clear the pond before stocking, during the breeding process regularly disinfect the body of water and food. When fish disease occurs, 0.2-0.5 mg/L furazolidone or 1 mg/L bleaching powder should be splashed in the whole pool for 2 to 3 days; at the same time, the fish should be fed with fish baits (50 kg/100 g fish for 100 kg) or red yeast. Vegetarian (30 kg fish, 30 g active ingredient), 1 day, 3 days for a course of treatment.

(b) Intestinal diseases Carnivore seedlings and major diseases of younger fish species. In the case of poor feed and environmental conditions are prone to occur; the popular season is from June to September. Control methods: First, do not feed corrupt spoilage feed; Second, strengthen water disinfection. At the time of the disease, Quanchiposa bleaching powder or 0.3-0.4 mg/L strong chlorine extract; at the same time, oral administration of sulfaguanidine (or oxytetracycline) baits, 5 grams per 50 kg of fish on the first day, the next day began to reduce Half a day, for 6 days as a course of treatment, it can effectively cure intestinal inflammation.

(c) Wilt disease is a form of malnutrition. In the cultivation of carmine fry, high density or bait can not keep up with the pond. Control methods: In normal times, feeding and management should be strengthened, and fish stocks should be properly stocked to ensure that the fry and fingerlings have sufficient feed supply. When symptoms of wilting occur, diseased fish can be kept separately and fed with leeches with high nutritional value, which can alleviate the disease.

In addition, parasitosis such as small melon insects and trichoderma often occurs in the cultivation process of carmine fry, and the control of small melonworm disease uses 0.1 to 0.2 mg/litre of mercurous nitrate per tank; Copper sulfate and ferrous sulfate mixture.

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