Pay attention to fishing pond fish in winter

Winter is a favorable time for pond fish fishing and listing, but winter fishing is also a potential factor to induce fish disease in the second year. Therefore, when fishing in winter, we must be careful to avoid damage to the fish as far as possible, so as to reduce the occurrence of fish diseases and improve the economic benefits of pond fish.

1. Remove sundries from the fish pond before fishing. The wooden piles, uncleaned large stones and water plants such as water hyacinth and water peanuts on the surface of the pond will affect the normal trawling. in order to catch winter smoothly and safely, we must first remove the obstacles in the pond to facilitate the operation of the net. A large range of uneven bottom or deep pit will also affect the fishing efficiency, which should be leveled in the dry pool stage before releasing fish.

two。 Release water before catching and irrigate after catching. According to local conditions, do a good job of drainage and irrigation of fish ponds. The water in the overwintering fish pond is relatively deep, if you do not release part of the water before fishing, it is not easy to pull the net, and the fish is easy to escape in the fishing process. Therefore, the water depth must be reduced to 1-1.5 meters before fishing. Immediately after fishing, irrigation should be increased to more than 2.5 meters, in order to raise the water temperature, so that the commercial fish that do not meet the standards can survive the winter safely, so as to raise them in the coming year and make continuous profits.

3. Correct selection of net gear. First of all, choose the size of the net: the length of the net should be at least 1.4 times the width of the fish pond, and the height of the net should be at least 2 times the depth of the water. Secondly, the mesh size should be determined according to the specifications of fishing. If the mesh is too small, it will drag up small fish and cause unnecessary damage. Trawls are generally made of nylon mesh.

4. Choose the place to get down and close the net. Choose the location of the net: one is to cast the net in shallow water, and the other is to set the net at one end of the leeward pond and trawl upwind when it is windy. When trawling, the bottom class forms an angle with the bottom of the pond, and when the net is started, the fish are dense. in order to prevent the fish from escaping from the bottom, the place where the slope of the pool ridge and the horizontal plane is 30 °~ 40 °should be selected, and the slope is flat and free of sundries.

5. Get off the net gently, get up the net quickly. When fishing, you should pay attention to getting off the net and raising the net quickly, and remember that the net should be arranged and placed on one side of the pond before laying down the net, and then the bottom net, net clothing and float class should be gently put into the water along the edge of the pond, pulling the net from both sides at the same time. When pulling the net, you should move slowly within the range of the first 1 jump 1 and 2 on the surface of the fish pond, so as to avoid the fish swimming, jumping and colliding prematurely. When pulling the net to the second half of the pond surface, you should quickly close the net and set up the net to reduce the damage and escape caused by the fish. Trawl personnel on both sides of the force should be coordinated, not sudden outbreak of force, drag speed should be basically maintained at a uniform speed, not sometimes fast and sometimes slow.

6. Coordination and cooperation between the upper and lower outline. When trawling, the upper class is light and the lower class is heavy, and the upper class must move with the lower class, the upper class is slightly earlier than the lower class, the queen fish of the upper class is easy to escape, and the upper class is easy to take the lower class away from the bottom of the pond and "turn over" a large number of escaping fish. When approaching the net, the upper class should be gradually tightened and raised to prevent fish from jumping out.

7. Avoid continuous work day after day. Due to the low water temperature in winter, slow metabolism of fish and poor resistance, if the fish that do not need to be fished out are injured repeatedly in a short period of time, the wound will be difficult to heal, which will lead to the entry of water mold bacteria and reduce production in the coming year. Therefore, do not focus only on immediate interests and continue to work all day long.

8. Points for attention. Fishing should choose trawling when the weather is clear, such as the water quality of the pond is poor, it is better to trawl in the morning or in the morning. Stop feeding for one day before trawling to avoid injury to the fish; do not trawl when there is no oxygen in the pond. After fishing, the parent fish and small fish that do not meet the commercial specifications should be selected, washed with 3%-4% salt water for 10 minutes to prevent disease, and then put back into the pond for reproduction and growth in the coming year.