Live keeping transportation of the hottest aquatic

2022-08-06
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Keeping aquatic products alive and transported I. principle of keeping aquatic products alive and transported I. ambient temperature aquatic animals, like other animals, will have weakened metabolism and reduced demand for oxygen and nutrients when reducing their living ambient temperature. Therefore, as long as the physiological temperature and bottom-up conditions of different aquatic animals are mastered, the corresponding storage and transportation conditions are created, appropriate cooling methods are selected, a certain amount of oxygen is maintained, and the metabolites in the transportation process are eliminated in time, the aquatic animals can survive for a period of time in the transportation process. It is most important to keep proper low temperature during transportation. If it is transported with water, it is feasible to add ice in the water or place ice bags around the package, and the outer packing of the shipment shall be waterproof and heat insulated, such as waterproof cardboard boxes and plastic boxes with heat insulation treatment. Generally, it is required to have heat insulation performance of more than 30 hours

(II) oxygenation can prolong the survival time of aquatic products. The shipping density of aquatic products is proportional to the oxygen consumption. Lowering the storage and transportation temperature, using anesthetics and not feeding can reduce the metabolic activity of the living body, thus reducing oxygen consumption

(III) removal of toxic metabolites polypropylene single polymer composites such as ammonia and carbon dioxide produced by aquatic animals' own metabolism and their preparation methods metabolites will reduce the ability of aquatic animals to absorb dissolved oxygen from water, which will worsen with the increase of water temperature. The accumulation of carbon dioxide in water will reduce the pH value of water quality, accelerate the metabolic rate of aquatic animals, make the water quality deteriorate sharply, and eventually lead to the death of aquatic animals. Therefore, aquatic animals should be kept temporarily for several hours to several days before shipment, so as to eliminate metabolites as far as possible and avoid polluting water bodies during transportation

II. Keeping aquatic animals alive (I) shrimp live transportation technology it is convenient and economical for shrimp to take cooling measures during storage and transportation. Penaeus japonicus can tolerate a low temperature of 14 ℃, Penaeus chinensis can tolerate a low temperature of 9 ℃, and Penaeus monodon can tolerate a low temperature of 19 ℃. If long-distance air transportation is adopted, the low-temperature dormant transportation method of cooled sawdust can be adopted. The shrimp can be placed in an oxygenated water tank and the water temperature can be slowly reduced under monitoring conditions (ice method can be used). When the water temperature drops to 14 degrees Celsius, the shrimp enters a dormant state. One layer of shrimp and one layer of wood chips are put into a fiberboard box lined with polyethylene film (the wood chips are cooled in advance). The temperature in the box shall be kept at Celsius during packaging until the box is full. The sawdust used for packaging must be low resin content, untreated and free of any pesticides. Seaweed, vermiculite and rice husk can also be used to replace sawdust. The heat insulation fish box has better cold insulation performance. Penaeus monodon is less able to withstand low temperature than Penaeus japonicus, and usually uses closed membrane bags or inflatable boxes for live transportation. The amount of shrimp in the film bag depends on the transport time. Shrimp farms in the United States, Japan, Southeast Asian countries and Taiwan Province of China sell prawns to local restaurants in inflatable boxes with a volume of liters. The storage density of Live Prawns is large, and they are generally delivered to users by trucks within hours. It is reported that Japan has developed a "fresh keeping packaging system for live shrimp" that can keep the shrimp alive after 40 hours of transportation in the high temperature season in midsummer. The outer packing used in the system is a laminated board made of polyester film and aluminum spray wax paper, which has good heat insulation performance, and its thermal conductivity is only half of that of ordinary cardboard boxes. When using the system, firstly fill the paraffin coated waterproof cardboard box with sawdust that has been cooled to 5 ℃, then put the live prawn, zeolite and other preservatives pre cooled in the 13 ℃ cold water tank into the box, cover the cardboard, put it into the cold storage bag (minus 20 ℃), close the box cover, and finally put the waterproof cardboard box into the outer box for transportation

(II) live transport of Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix Meretrix meretrix. The key to the survival rate of Meretrix meretrix during transportation lies in the vitality of Meretrix meretrix. Therefore, dead and weak Meretrix must be carefully removed during selection. Once the live clam is infected by the body fluid from the dead clam, it will accelerate its death. For live clams to be exported, the temperature shall be kept at degrees Celsius during temporary storage and transportation. Below zero degrees Celsius, the clam will be frostbitten and die. Fresh water immersion shall also be avoided during temporary storage and transportation of live clams. Gunny bags should be used instead of plastic bags with poor ventilation

(III) after selecting and grading live snails, wash them with fresh water, pack them and transport them to the port for temporary storage or export. If it cannot be exported in time, it can be put into the temporary curing pool for temporary curing after packaging, or stored in a cool place and often drenched with water. Live snails are usually packed in bamboo baskets or wicker baskets

(IV) live swimming crab use a rubber band to tie the live swimming crab's pincers and transport them to the port for export after packaging. If it cannot be exported in time, it can be put into a natural bay for shelter from the wind, or put into a cement pool with oxygen increasing equipment for temporary maintenance. The water quality should be clean during temporary curing, and the sandy bottom bay or pool with flowing water is the best. The temporary incubation time should not exceed 3 days, and the mechanical bench of the test bench should be checked every day by the electric cylinder loading mechanism, fixture mechanism, loading mechanism, platform body, etc. to pick out dead crabs, so as to prevent water pollution and affect the survival rate. Before packaging, one kind of live swimming crab should be gradually reduced to zero centigrade to make it enter the dormant state and prolong the survival time. Packed in cartons, lined with cardboard at the bottom and covered with sawdust. The sawdust is sterilized to keep it fresh, clean, dry and free of odor. Before use, the packing box shall be placed in a freezing day at a low temperature of minus degrees Celsius, and the drained live crab shall be placed vertically in the box with its mouth upward. Each layer shall be filled with wood chips, and the packaging and transportation shall be carried out at the temperature of Celsius

(V) fresh water fish can be transported alive. Generally, the hardness tester belongs to precision instrument wooden box, canvas bucket or special live fish truck. For water transportation, the fish can be directly placed in the cabin or transported by a live water vessel specially for transporting live fish. The container shall be filled with oxygen during transportation. It is better to install oxygen cylinders on the transport vehicle. The temperature of fish water shall be controlled below 12 ℃

information source: Information Center of Information Institute of Guangdong Academy of Agricultural Sciences

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