What kind of harvesting methods does Japanese shrimp have?
In Japan, there are roughly three methods for raising Japanese shrimps in trap collection pools: trap nets, pump nets and electric shock traps. The trapping method is to catch shrimp at night. The advantage is that there are fewer injuries and the operation is very convenient. It is a commonly used method of catching shrimp in the shrimp harvesting season in Seto Inland Sea. During the warm season, shrimps are active in ponds and can be harvested in large numbers using trap nets. However, when temperatures decrease during the fishing season, trap nets should be added in order to harvest shrimp that has become rarer. The trap network consists of a network wall, a net sleeve, and three traps. The wall is set at right angles to the bank. Each trap has two layers of funnel nets, and its openings are fastened with clues. The shrimp enters the sac along the net wall and finally enters the trap, and is removed from the end opening at appropriate intervals. As the season goes by, the water temperature drops, and the pump net or electric shock catcher shrimp is used instead. The latter has a good effect on shrimp. The Japanese Asahi Commercial Farm harvest shrimp pool using pump network method is: the net is installed on the metal frame, the metal frame is equipped with a nozzle pipe into the water, with high pressure water gun to drive the shrimp on the sand, the shrimp alarm jumping (nozzle agitation The depth of the water reaches 8 cm) and it is caught with a cone net. Electric shock trapping method is battery, voltage meter, ammeter and distribution board all installed on the ship. During operation, the current of the battery pack is charged on the grid electrical panel, which contacts the bottom of the pool and stirs up the shrimp in the sand. The shrimp jumps out and falls into the trawl. In summer, the water temperature is high. Even low voltage can affect the shrimp. A small portion of the shrimp will be dying. The general principle is to use low voltage in warm water and high voltage in cold water with a voltage range of 4-20 volts. In China, there are currently two approaches to adopting the shrimp collection method for catching Japanese prawn in ponds. 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 type of harvesting is small and suitable for small quantities. Another type of catching shrimps is to lower the water level (using drainage and pumping water), starting from the dry spots around the shrimp ponds, and using your hands to catch sand and catch shrimp. As the water level drops, you gradually 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 harvest it once, and it is necessary to inject new water so as to avoid the occurrence of hypoxic floating heads due to shallow water levels and deterioration of water quality.
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