Japanese prawn harvesting and processing

Harvest method

To achieve product specifications can be arrested and listed. At present, the adoption of the shrimp collection method for catching Japanese prawn in ponds has two methods. One is to drain the water at the drain outlet during the night. Because the Japanese shrimps swim in the sand at night, the water enters the net and is collected. Pay attention to whether the nets are damaged or not, and pay attention to the fact that there are a certain amount of shrimps in the net, then you can collect shrimps from the net to avoid the shrimps being suffocated in the net. This method has a low harvest and is suitable for small quantities. Another way to collect shrimp is to lower the water level (using drainage or mechanical drainage). Start from the dried-up areas around the shrimp ponds. Use your hands to catch sand and catch shrimp. Gradually, as the water level goes down, you will catch shrimp deep in the pond. This kind of work can be carried out day and night, and it can collect a lot of shrimp, but it requires a lot of manpower. If this kind of operation is in a large pond, it is difficult to close it once, and it is necessary to inject new water to prevent the occurrence of hypoxic floating heads due to shallow water levels and deterioration of water quality.

Processing Technology

Japanese prawns have strong vitality. After the shrimps leave the water, they can continue to live for a long time by relying on the oxygen in the remaining water in the urine. Therefore, Japanese shrimp is mainly marketed as live shrimp, and basically it is not processed. To ensure the transportation and export of live shrimp, the following method is used.

(1) Put the shrimp in low-temperature water at 10-12°C before transport. The water temperature in the breeding ponds is often high (especially in summer). Therefore, when the shrimps come out of the pool, the temperature of the packing site should first be reduced to a lower temperature, which means that the temperature should be gradually reduced by steps, and the temperature difference should not exceed 5°C. During the cooling process, the pool is covered with canvas or black cloth to dim the light so as not to damage the shrimp and clam shells.

(2) It is used as a heat-insulating filler material for prawns, preferably granular sawn fir shavings. After it is dried, it should be stored at -10°C. It must be tasteless when used, but it must have a certain humidity.

(3) The corrugated paperboard box should be used for the outer package, which has better heat preservation performance, pressure resistance and lighter weight. Its specification is 302515cm. In the summer, shrimp can be loaded with 2.0kg, and in the winter, it can hold up to 3.0kg.

(4) Packaging is performed in a temperature controlled room (5-10°C). After the shrimps are sorted by size, they are weighed when packed in the box (to ensure the weight requirement of each box). Then a layer of sawdust is layered into the cardboard box. Each layer of shrimp should also be properly arranged to avoid overlap. Note that the lowermost and uppermost floors and surrounding areas should be covered with wood chips and the shrimp should not be active. If the temperature is high, put a small ice pack on top of the wood chips and seal it with tape.

(5) Ensure that the transport arrives at the destination in the shortest possible time to ensure a constant low temperature. For long-distance transportation, refrigerated vehicles are used. If they are sold abroad, they need to be airlifted, and vehicles and airplanes should be connected.

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