Carbon dioxide and carbonic acid assist live fish transport
CO2 assisted live fish transport is a new technology that allows live fish to sleep for a long time to reduce transport costs. When transporting adult carp with CO2, the carp should be perfused alternately with CO2 gas containing high partial pressure (27-33KPa) and low partial pressure (13-17KPa). The transportation time can last about 10 hours and the mortality rate is very low. A mixture of carbon dioxide and oxygen (50:50) can also assist in transporting live fish. At this time, gas can be injected directly into the water containing crucian carp and carp, so that the behavior of fish in the water is gradually retarded. After about 25 minutes, the fish will sink to the bottom of the "sleep". At this time, the fish can be taken out of the water and put into plastic bags or boxes for transportation, which can last for more than 30 hours. When the fish are transported to their destination, they are put into water and blown with oxygen. After 5 minutes, they can wake up. When carbonic acid is used for live fish transportation, sodium bicarbonate solution (referred to as solution A) with a concentration of 6.75%(G/V) and sulfuric acid solution (referred to as solution B) with a concentration of 3.95%(G/V) shall be prepared in advance. The dosage of equivalent solution A and solution B shall be calculated according to the following formula:
Amount of solution A or B (ml)= drug concentration * total volume of water in liters/50.
After carbonic acid treatment, the fish lost balance, lying on their sides or supine, breathing rate slowed down and moved slowly.
The suitable dosage of the medicine for transporting fish is 150-600PPm, and the optimum dosage is 500PPm. When the water temperature is 22℃, the survival time of fish is 6-13 hours. When used for carp fingerling transportation, the survival time can reach 25 hours. When used for transportation of freshwater pomfret fry, the survival time can reach 21 hours (10% mortality).
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Culture of Mysis prawns
(1) in the 1970s, Mysis prawns were cultured in Shantou, Guangdong and Fujian, or collected from natural waters as bait for seahorses; Rizhao Mariculture Experimental ground in Shandong Province used soil ponds to cultivate black and brown bran shrimp and achieved good results. At present, the biology of black-brown prawns has been deeply studied along the coast of Shandong, China; in Japan, common prawns, Japanese prawns, perfect prawns and medium-sized prawns have all been studied in vivo or fishery biology. all these species can be classified as culture species.
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How to distinguish high-quality fish species
A look at the specifications of fish species the specifications of the same kind of fish in the same pond should be neat and uniform, with little difference in body length and weight. On the contrary, the overall survival rate of poor fish species with large individual gap and uneven quality is often very low due to predation, mixed germplasm, poor feeding and other reasons. Second, look at the body color of fish species. The body color of fish species is bright and full of luster. Different species and different feeding methods have different body colors. Generally speaking, the back of high quality silver carp should be silver gray, the side of body and abdomen should be silver white, and the body color of high quality grass carp should be light.
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