Winter is the fishing season for pond fish, but improper fishing can cause fish pond disease in the second year. Therefore, when fishing in winter, it must be carefully handled to minimize fish body damage, so as to reduce the occurrence of fish diseases and improve the economic benefits of fish farming.
First, remove debris. The wooden stakes in the pond, the uncleaned large stones, the water hyacinth, and the water peanuts in the pond will affect the normal net pull. Before catching, you must first clear the obstacles in the pool water in order to facilitate network operation.
Second, pre-drainage drainage, post-catching irrigation. In winter, fish ponds have relatively deep water. Before fishing, the water depth must be reduced to 1 to 1.5 meters. Immediately after catching, water should be raised to increase the water level to more than 2.5 meters so as to raise the water temperature and ensure that commercial fish that have not reached the standard safely pass winter.
Third, the correct selection of nets. The length of the net should be more than 1.4 times the width of the fish pond, and the height of the net should be more than 2 times the depth of water. The mesh size is determined according to the specifications of the fishing. A small mesh size will also drag small-sized fish and cause unnecessary damage.
Fourth, select the next network, collecting sites. In the shallow water, the net will be in the deep water, and in the wind, the wind will be trawled in the wind at the end of the pond at the end of the net. During the trawl, the bottom outline forms an angle with the bottom of the pool. The starting point of the trawl should be a place with a slope angle of 30 to 40 degrees from the horizontal plane, and the slope of the slope should be free of debris.
5. Light down the net and get up quickly. Before the next net, arrange the fish nets well and put them on the side of the pond. Then gently place the bottom net, net clothing, and floating net along the pond into the water and pull the nets from both sides. When you pull the net, you must slowly advance before the first half of the surface of the fishpond. When you pull the net to the latter half of the pond, you must quickly close the net and raise the net to reduce the amount of net fish damage and escape. The trawlers on both sides must work together in a concerted manner. When dragging, the speed must be kept at a constant speed.
Sixth, coordination between the top and bottom outlines. When trawling, the upper rank of the upper class should be reduced to a lower level, and the upper class must move with the lower rank. The upper rank is slightly higher than the lower rank. The fish is easy to escape on the upper deck, and the upper deck is easy to bring up the lower class to get out of the bottom of the pool and cause the “overrun†to escape the fish. When approaching the net, the upper deck gradually tightens and raises the fish to jump out.
VII. Avoid continuous operations for consecutive days. In winter, when the temperature is low, the resistance of the fish body is poor. If the fish that need not to be caught are repeatedly injured in a short period of time, the wound will not heal. This will cause water mold to enter the disease and cause illness in the coming year, resulting in reduced production and income. Therefore, do not continue to work for a few days in advance.
Eight, other precautions. Fishing should be conducted when the weather is fine. If the water quality of the pond is poor, the trawl time should be selected in the morning or in the morning. Stop for a day before trawling to avoid injury to fish. The pond cannot trawl when lacking oxygen. After fishing, broodstock and small fish that do not meet the specifications of the commodity should be selected. Rinse with 3% to 4% saline for 10 minutes, then disinfect and prevent disease and return to the pond.
First, remove debris. The wooden stakes in the pond, the uncleaned large stones, the water hyacinth, and the water peanuts in the pond will affect the normal net pull. Before catching, you must first clear the obstacles in the pool water in order to facilitate network operation.
Second, pre-drainage drainage, post-catching irrigation. In winter, fish ponds have relatively deep water. Before fishing, the water depth must be reduced to 1 to 1.5 meters. Immediately after catching, water should be raised to increase the water level to more than 2.5 meters so as to raise the water temperature and ensure that commercial fish that have not reached the standard safely pass winter.
Third, the correct selection of nets. The length of the net should be more than 1.4 times the width of the fish pond, and the height of the net should be more than 2 times the depth of water. The mesh size is determined according to the specifications of the fishing. A small mesh size will also drag small-sized fish and cause unnecessary damage.
Fourth, select the next network, collecting sites. In the shallow water, the net will be in the deep water, and in the wind, the wind will be trawled in the wind at the end of the pond at the end of the net. During the trawl, the bottom outline forms an angle with the bottom of the pool. The starting point of the trawl should be a place with a slope angle of 30 to 40 degrees from the horizontal plane, and the slope of the slope should be free of debris.
5. Light down the net and get up quickly. Before the next net, arrange the fish nets well and put them on the side of the pond. Then gently place the bottom net, net clothing, and floating net along the pond into the water and pull the nets from both sides. When you pull the net, you must slowly advance before the first half of the surface of the fishpond. When you pull the net to the latter half of the pond, you must quickly close the net and raise the net to reduce the amount of net fish damage and escape. The trawlers on both sides must work together in a concerted manner. When dragging, the speed must be kept at a constant speed.
Sixth, coordination between the top and bottom outlines. When trawling, the upper rank of the upper class should be reduced to a lower level, and the upper class must move with the lower rank. The upper rank is slightly higher than the lower rank. The fish is easy to escape on the upper deck, and the upper deck is easy to bring up the lower class to get out of the bottom of the pool and cause the “overrun†to escape the fish. When approaching the net, the upper deck gradually tightens and raises the fish to jump out.
VII. Avoid continuous operations for consecutive days. In winter, when the temperature is low, the resistance of the fish body is poor. If the fish that need not to be caught are repeatedly injured in a short period of time, the wound will not heal. This will cause water mold to enter the disease and cause illness in the coming year, resulting in reduced production and income. Therefore, do not continue to work for a few days in advance.
Eight, other precautions. Fishing should be conducted when the weather is fine. If the water quality of the pond is poor, the trawl time should be selected in the morning or in the morning. Stop for a day before trawling to avoid injury to fish. The pond cannot trawl when lacking oxygen. After fishing, broodstock and small fish that do not meet the specifications of the commodity should be selected. Rinse with 3% to 4% saline for 10 minutes, then disinfect and prevent disease and return to the pond.
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