Raising the survival rate of fish fingerlings is an important measure for the high yield of fish farming. We must grasp the key five points.
First, stocking time after the winter solstice is the best time to enter the fish before the convulsions, when the water temperature is 5 °C ~ 10 °C, the favorable species of catch transport and sorting selection, but should choose the sunny operation, Yufeng Xuefeng freezing weather is not appropriate Stocking to prevent frostbite fish species, affecting the survival rate of pond fish.
Second, choose a good fish species saying: "a good fish pond." High-quality fish, full of fleshy, solid body, normal body shape, complete scales, smooth surface, body color and bright eyes, holding in the hands of fierce, strong in the water. Due to the large-sized fingerlings, the adaptability is strong, the disease resistance is stronger, and the survival rate is also high. Generally the grass carp weighs 250 grams per tail, the carp weight is 50 grams per tail, and the carp weighs more than 100 grams per tail. .
Third, the short-distance transport of fingerlings can be transported by buckets. Each 1000 kg of water is loaded with 10 species of fish with a length of about 10 cm. It is suitable for long-distance transport by truck. It transports 10 to 3,500 fishes of 10 cm in length per ton of water. Transport, about 10,000 fish per ton of water, but the transport is fast, and in the water loaded fish put some soft leaves and other cotton floating debris, used to buffer the vibration of the water to reduce the bumps and friction on the fish.
Fourth, the disinfection of fingerlings to enhance their resistance to disease and prevent the death of infected fish after the release of the species, before the release of fish species, must be sterilized before investment. Disinfection method: Use 3% to 5% of salt to dip for 5 minutes to 10 minutes, or use 3% of bleaching powder and 8 grams of copper sulfate per cubic meter of water to dip for 5 minutes to 20 minutes. Grass carp should also be injected with 0.2 ml. -0.5 ml of a 10-fold dilution of grass carp hemorrhagic inactivated vaccine to prevent viral hemorrhage.
5. Fish species purchased by the fishery rescuers are subject to excessive jolting during transportation and excessive physical exertion resulting in a coma "whitening" phenomenon. If ambulances are not performed, they can easily die. When the fish coma is found to be "turning white," immediately place the fish in a clear, sunny water at a water temperature of 5°C to 10°C, and water in the water by hand to spread the water evenly on the surface of the fish. The frequency should be close to the respiratory rate of the fish until the fish can swim. Because of the vibration of water waves, this species of fish is forcing the movement of the fish, thus enhancing the blood circulation of the species, and supplying the oxygen needed for breathing in time, restoring the physical strength as quickly as possible. The water can also wash away the mud and water on the fish body and the mud. Things.
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