Summer fish pond fry tips

Clear pond disinfection 10 days to 15 days before the fish ponds, 60 grams per acre to 100 kilograms of bleach or 13.5 kilograms of bleached water bleaching Quanchiposa; a clear water test for toxicity. Method: One day before fry release, take several fishes and put them in fish pond cages. Observe them for 6 hours to 8 hours.

Fry stocking should choose healthy and disease-free fry. Identification method: the fry on porcelain pots, struggling vigorously, head and tail bending for strong seedlings. Before fry stocking, put it in a plastic basin. The egg yolk was kneaded and diluted with water, filtered through a 40-mesh polyethylene net, and evenly sprinkled into the pot. Every 10,000 fish fry were fed 2 to 3 egg yolks. When the fry is full, put it in the fish pond. Stocking densities: The stocking rate per mu for the Wuzi sub-pool is 150,000 to 200,000; the stocking capacity for the summer sub-pool is 100,000 to 150,000. The same pond must be placed in the same batch of fry, especially grass carp and squid, and must not be large or small. Should be selected to clear the seedlings for good weather, when fry stocking, we must stand on the top of the stocking slowly, so that fry floating into the water, otherwise it will reduce the survival rate of fry.

The difference between the temperature of the water in the front fry of the pond and the temperature of the pond under the temperature difference should not exceed 2°C. If the temperature difference is too large, it is necessary to adjust the water temperature of the fry and the temperature of the pond to be basically the same and then release the seedlings. When the fry is transported in plastic bags, the plastic bag is placed on the surface of the water for “cooling” for 1 hour before opening the pond.

In the epidemic season of prevention and treatment of fish diseases, 15 kg of lime and 25 kg of water of lime are splashed every half a mu. Found that fish fry suffering from bubble disease, horse disease or other bacteria, parasitic diseases should be symptomatic treatment as soon as possible.

When the watering fry time is lower, the water depth is from 50cm to 60cm. After every 3 days to 5 days, the water is injected once. Each time the water is injected 10cm to 15cm. During the cultivation period, water is added 3 times to 4 times. The final water depth is 1m to 1.3m. . Each time the water injection should not be too long, so as not to fry fish for a long time, affecting the constitution. When water is injected, care should be taken to use a dense mesh filter at the water inlet to prevent wild fish and predators from entering the pond with water. At the same time, it will not let the water flow up the mud in the bottom of the pool and stir up the water in the pool.

Feeding and fertilizing Rearing fry is generally done with soybean milk and soya bean milk. Soaked soybeans are soaked in water until the gap between the watercress is flattened, and then water is added to the watercress. 1 kg of soybeans is used to grind 20 kg of soybean milk. Milk should be fed immediately after the grind, and should be sprayed evenly. Normally, it is fed from 8 a.m. to 9 a.m. and from 2 p.m. to 3 p.m. At the beginning, three to four kilograms of soybean milk per acre is poured, and after one week, it is increased from 5 kg to 6 kg. The cultivation of 10,000 summer flower fish species requires about 10 kg to 18 kg of soybeans. A pond that raises herbivorous fry, such as grasses and alfalfas, should be kept shallow in the pond after one week of feeding. Feed duckweed or shredded young grass. In addition to feeding, according to the pool of fat is also appropriate to top-dressing, generally per acre water daily topdressing manure 50 to 70 kg of manure.

The base fertilizer is filled with water 50 cm to 60 cm in the first week of the fish seedlings pond and fertilized in the pond to cultivate the palatable natural food of the fry. Normally, per mu of composted human excrement or pig cow dung 300 kg to 400 kg, the water transparency of 30 cm to 40 cm, the water was dark brown, oil green or light yellow as the fish pond pond the most suitable time. If a large number of copepods, branches and larvae occur after fertilization, 90% of trichlorfon 0.4ppM is killed. When phytoplankton blooms in large quantities and there are too many green algae, the fry is susceptible to bubble disease, and the pond must be filled with fresh water and then the fry and then the lower pond.

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