In the production practice, the transportation of fry fingerlings is a very important link. To make this link better, we must pay attention to the following 10 questions. 1 Pay attention to the use of suitable containers for transporting fry species of fish commonly used containers are oxygen bags, canvas buckets, wood (iron) barrels, plastic buckets, fish bowls and so on. Oxygen bags and canvas buckets are suitable for long-distance, long-time, high-volume transport, while wooden (iron) barrels, plastic barrels, and fishing rods are only suitable for short-distance, small-scale transport. When transporting oxygen bags, attention must be paid to the quality of the oxygen bags. Now many manufacturers produce double-layer oxygen bags, which are relatively safe, but also pay attention to the use of fry boxes (or cartons of other volumes), or they can be packed in woven bags to avoid transit. Prick the oxygen bag with a hard object. When transporting with a canvas bucket, be careful to soak the canvas bucket into the water 2 to 3 days before the fish transportation, so that the canvas bucket can become soft and reduce the damage of the fish species during transportation. 2 Pay attention to the choice of fry "Lao Nen" according to the length of transportation time. In general, if the transportation time is less than 5 hours, the fry with a lighter black color should be selected. When the transportation time exceeds 5 hours, the fish body color should be lighter (tender), but the waist point must be flush. If the hatchery takes a long time, the old seedlings with darker body color will consume more nutrients in the body and should not be transported in long distances. Otherwise, the survival rate is very low. For fish fry that have already started feeding, egg yolk must be fed 2 to 3 hours before departure (one egg is fed every 400,000 pigs), and then the fresh water is shipped. 3 Pay attention to the selection of healthy, disease-free and fry-resistant fingerlings. Robust seedlings can resist the damage caused by serial operations and transportation. Well-balanced fry manifested as waist points, neat specifications, rapid swimming, and strong anti-water power. The fish with strong physique are characterized by shiny body, complete scales, wide head and small back, neat specifications, quick action, and strenuous struggle. Those who took the sludge, the body was thin, the head was generally small, the specifications were uneven, the scales fell off, and the swimming impotence were not suitable for transportation, otherwise the survival rate was low and fish diseases were also transmitted. 4 Note that before pulling the net before exercise to transport 2~3d before netting exercise 1-3 times, you can make the fish fully dense and frightened, the metabolism is enhanced, the muscles are strong, the physical fitness is enhanced, the excretion of large amounts of feces, secretion of a large amount of mucus, and enhancement Resistant to hypoxia and reduce water pollution during transport. Also note that no feed is given on the day of shipment, and 2~3 h are held in clean water before departure. 5 Pay attention to the water used for transportation water transportation must use clean water, containing organic matter, high dissolved oxygen, non-toxic odorless rivers, lakes, reservoir water. Fertilizer, saline water, and contaminated water in the pond cannot be used. Tap water is heavier than chlorine and should not be used directly. When it is used, it must be dechlorinated or stored for 2 to 3 days. Well water is clean but has low oxygen content and can be stored for some time or partially infiltrated in the above good water. At present, many people add penicillin or streptomycin in transportation water. It can not only inhibit bacteria and sterilize, but also prevent the occurrence of fish diseases and deterioration of water quality. The effect is very good. The dosage is about 5 million IU per cubic meter of water. 6 Note that the transport density and transportation water temperature transport density of oxygen bags for oxygen transport is generally per bag (12.5L water) loaded with 50,000 seaweed, Wuzi 5000 tail, 1500 inch tail, 6 ~ 10cm fish species 300 ~ 800 or so . The transport of canvas buckets is generally from 250,000 to 350,000 tails per cubic meter of water, 100,000 to 150,000 tails of ebony, 40,000 to 50,000 tails of cubs, and 20,000 to 30,000 tails of 6 to 10 metre fish. The above transport density refers to the density of water temperature around 18°C ​​and transport time around 5h. The general transportation water temperature is: 5 ~ 15 °C for transporting fish, 15 ~ 25 °C for transporting fry, and the lower the better in this range. Also transport shade, ventilation and avoid direct sunlight. 7 Be careful to check oxygen bag when transporting. Always check whether the oxygen bag is broken or not. If there is leakage, change the bag and oxygenate it. Use other containers to transport regularly check the fish's activity. If floating heads occur, change the water promptly. Change water must be replaced with clean, non-polluting water, use a scoop or use a plastic hose to aspirate the old water, and then gently add new water. When changing the water, avoid adding fresh water to prevent damage to the fish. The water exchange volume is generally 1/3 to 1/2. If it is difficult to change the water, it may be supplemented with dissolved oxygen by spraying water, spraying water, or pumping air, and oxygen-enhancing drugs such as oxygen increasing spirit may also be used. 8 Pay attention to the container's hygiene to remove dead fish and manure in a timely manner to reduce the damage to the water quality. Dead fish can be fished out of the net and feces can be sucked out with a rubber tube. 9 Pay attention to carry the necessary utensils to transport fry seedlings. It is generally necessary to carry oxygen bags, rubber bands, tapes (or clear plastics), plastic hoses, scoops, buckets, oxygen bottles (a few oxygen bags can be used to transport a few bags of oxygen Spare), air pump, oxygenation agent, hand fishing net and other equipment items. 10 Be careful planning and preparation before planning and preparing for transportation. Such as shipping time, departure time, arrival time, manpower arrangement, tool preparation, midway exchange of water, etc., must be planned to be ready for quick installation, express delivery, and shorten the transport time as much as possible.
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