Fry fingerling winter and spring safe transportation method

Winter and spring is the season when fish and fingerlings are released. Off-farm transportation of fry and fingerlings has become an important part of freshwater aquaculture production. Transportation should be safe and efficient, and the survival rate of transportation should be guaranteed and improved. First, the fish should be selected to select the fish back, tail flesh thickness, the body is strong, bright color, scales, fins intact, no injuries on the surface and parasites, swimming in the cage active, strong anti-water, intensive in the box One of the fish heads, head down, tail up to grab the water. Fish species with a total length of about 13 centimetres are common, with grass carp being 48 per kilogram, 44 white pheasants, 42 calyx, and 40 squid. Second, the seed transport 1, plastic bag oxygenation transport plastic fry bag specifications 70 cm 40 cm. The water temperature is 20-25°C. It can carry 80-10,000 fingerlings per bag, 5000-7000 tails of Wuzi and 1200-1500 tails of summer flowers, or 600-800 tails of fish species that are 5-7 cm long. 7-8 300-500 centimeters of fish species, and can guarantee survival rate of 90% in 24 hours. 2, when the water temperature of the canvas canopy is about 20°C, generally 20,000-300,000 tails of fry (0.4-0.5 cubic meters) can be loaded on the canvas, 10,000 on the Wuzi and 1.4-1.8 million on the summer flower; or 8 - 0.3-0.4 million fish species that are 10 cm long. With oxygenation conditions, the density can be increased to 40%-20%. 3, canvas lining plastic bag lined with oxygen transport in the canvas lining a large plastic bag, the bag is more than 2 times the height of the gong. Fill the water to one-half the height of the loquat, then load the fish, squeeze out the air inside the loquat, recharge the oxygen, and tie the bag to transport. The density of fish is 2.5 times that of open transportation. Third, pay attention to the transport of seedlings before the development of a careful transport plan, ready for loading and unloading, shipping, disinfection and other tools and drugs and disinfection of the pond, ready oxygenation equipment. The transportation density shall be determined according to the type, specification, water temperature, water quality, transportation time, transportation method and oxygen supply equipment of the fish. The weight ratio of general fish species to water body is preferably 1:4-1:5. Choose a sunny day to transport the fish species. 2-3 days before departure, the food should be stopped. Fish should be intensively 2-3 times by pulling the net. 2-3 hours before shipment, the fish should be pulled in the holding box to raise. Strictly use sieves to sieve the fish species, remove the wild fish, and ensure that the specifications are consistent. During the transportation, you should always observe the dynamics of the fish and adjust the amount of oxygenated. The water is changed every 5-8 hours, and the old water is discharged to about one-third of the new water. Once oxygen species are found to be oxygenated, they should be oxygenated in time. After the arrival of the fish species, "people and other fish" and "water and other fish" are required. The fish should be soaked and disinfected before the fish pond.

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