Cultivation pond conditions
The cultivation pond area should be between 1 mu and 3 mu. It requires adequate water sources, fresh water, convenient water injection and drainage, clearing excess silt at the bottom of the pond (maintaining about 10 centimeters) before restocking, and renovating the pond bank to prevent leakage.
Clear pond and fertilizer
10 to 15 days before stocking, fry uses 150 kg of lime for dry clear ponds to kill wild fish, pathogens, parasites and other predators. 7 days before stocking, water is poured into the pond from 30 cm to 40 cm. When the water is poured, the nozzle is wrapped with a 40-mesh sieve to prevent the entry of wild fish and predators. The use of bio-fertilizer king 4 kg -5 kg ​​per acre, in order to cultivate natural diet of fish fry, new ponds can apply inorganic fertilizer 3 kg -4 kg.
Fry stocking
The stocking density of yellow catfish fry is appropriate to 3-50000 cats per mu, single breeding is better, and can not be mixed with carp and carp seedlings. The best fry in the lower pond is the hatchling of the same batch of fry. If the hatching time differs greatly, it is easy for the fry to grow unevenly and cause the survival rate to drop. Water temperature, pH value, dissolved oxygen and ammonia nitrogen of the pond should be measured before laying the seedlings. The water temperature in the fry bag and the pool water temperature should not exceed 2°C, the pH value should be between 6.8-7.5, the dissolved oxygen should be greater than 5 mg/l, and the ammonia nitrogen should be less than 0.06. Milligrams per liter, can be lower pond.
Fry cultivation
In newly hatched larvae, the yolk sac did not completely disappear and its swimming ability was weak. They like to cluster at the bottom of the water body and feed on small zooplankton such as rotifers. The early natural bait culture is adequate, which will greatly improve the survival rate of the fry. If it is found that there is a shortage of feed, artificial breeding of rotifers, additional organic fertilizers, cutting grass stacks, and splashing yellow soybean milk in the morning and evening can be used to promote zooplankton breeding. Gradually raise the pond water level to 0.8-1.5 meters to increase the space for fish movement. When it grows to 2 cm -3 cm, the natural food in the pond can no longer meet its feeding needs. Artificial sturgeons can be artificially introduced into the puffed floating feed for stingrays. At the beginning, a small amount of feed pellets can be sprinkled throughout the entire day. After the fry begins to eat feed, the feed is gradually reduced to the two to three fixed positions of the pond. In this position, a bait station is set up for fixed feeding. Each bait area is 4 square meters - 6 square meters. The number of feedings began just 3 times -4 times a day. After the acclimation was complete, 2 times -3 times a day. The amount of feeding was based on the feeding conditions of the fry.
Daily management
Adhere to the Xuntang daily and observe the water and fish feeding and activity conditions. Water, microbial preparations, sprinkling and fertilizing, and aerators are used to maintain fresh water, adequate dissolved oxygen, and rich food organisms. At intervals, the ponds were sterilized and sterilized, and vitamin C and other immune preparations were regularly added to the feed to improve the disease resistance of the fry and prevent the occurrence of fish diseases.
The common and frequent diseases of stingrays are:
(1) Saprolegnia: Symptoms of waterborne fungus parasitism caused mainly by fish abrasions should be avoided during fishing, transportation, and stocking, and the use of thioetherfloxacin 200 ml behind fish ponds should be avoided. Sprinkle per meter per meter per meter, can reduce the incidence of this disease.
(2) Trichoderma and cicadasis: The diseased fish is out of colonies, often lying on the side or lying on the water surface, or swimming along the edge of the pond. Severe cases lead to death. Microscopic examination can find that a large number of parasites are parasitized in the pelvis. Can be used 0.12ppm1% avermectin solution and 0.12ppm 40% phoxim solution mixture Quanchiposa treatment.
(3) trematode disease: mainly parasitic in fish intestine, some of the diseased fish have "cataracts" or head congestion and other symptoms, in the water kept spinning, soon died. The disease is mainly prevented by the use of intermediate hosts such as snails. At the time of onset, 2.5 ml of a 0.4% ivermectin solution per kilogram of feed can be fed continuously for 2 days to 3 days to reduce losses.
(4) Hemorrhagic edema disease: The diseased fish's abdomen enlargement, anal swelling and eversion, part of the head congestion, a large amount of blood in the abdominal cavity. Can change 50% of water first, then use 0.25-0.3ppm trichloroisocyanuric acid to disinfect the body of water for 2 consecutive days -3 days.
Daily management
Every day, we observe the water quality, fish activities, and eating conditions in the morning, evening and evening. We must diligently remove the weeds in the pond, and remove debris, dirt and dead fish from the pond to avoid water quality deterioration and reduce fish disease. infection. In the event of hot weather or a sudden change in weather, the number of night patrols should be increased in order to take measures to prevent accidents. At the same time, it is necessary to make records and sum up experience in a timely manner to ensure the smooth progress of aquaculture production.
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