For the fishing of fish, whether fresh fish are listed or fry are sold, improper fishing can easily lead to the occurrence of fish diseases such as storing fish in ponds, transferring fish to ponds, or re raising fish after purchase. Therefore, it is necessary to pay attention to and master the following precautions.

        1、 Pay attention to weather conditions: Fishing with nets must be carried out around dawn, when the weather is clear, cool, and the fish in the pond do not float, as this has the least impact on the fish in the pond and can timely supply the fresh fish caught to the morning market. It is not advisable to catch fish with nets in cloudy and hot weather to avoid causing a large number of dead fish. In addition, it is not advisable to catch fish in ponds with floating heads or fish diseases.

        2、 Pre catch feeding restriction: It is best to stop eating for a day before pulling the net to reduce the metabolic burden on the fish. After a fish is full, its oxygen consumption increases, and it may jump and flee when caught in a net, which can easily cause death. Therefore, the feeding should be stopped or the feeding amount should be reduced one day before the start of the net fishing. Do not feed a large amount of concentrate in order to increase the weight of fresh fish on the market, otherwise it will cause consequences that are not worth the loss.

        3、 Fishing gear selection: The net length should be more than 1.2 times the width of the fish pond, and the net height should be more than 2 times the depth of the water. Remember that the mesh size should not be too small to reduce fishing losses.

        4、 Fishing method: It is best to lift the net. When fishing by pulling the net, it is necessary to gently lower the net, quickly lift the net, and try to shorten the time for live fish to leave the water as much as possible to avoid suffocation and death of live fish due to a long time away from the water, and to avoid continuous operation for days.

        For fishing ponds with large areas and dense fish storage, it is not advisable to catch them all in the pond. It is advisable to catch half or one-third of the pond. Due to the high water temperature, pond fish have strong mobility, high oxygen consumption, and are not tolerant of dense fishing. When there are too many fish in the net, it is most likely to cause injury or death to the fish. When fishing with a net, it is important to be quick and cautious, minimizing the sound as much as possible to reduce the disturbance to the pond fish. After rounding up the fish, the small fish in the net that have not yet reached the product specifications should be quickly and lightly returned to the original pool, and then the large fish on the market should be picked to avoid damage or suffocation to the small fish.

        When fishing, gently lower the net and quickly lift the net: first, arrange the net and slowly put it into the water, and pull the net from both sides simultaneously. Avoid jumping and colliding fish due to excessive speed in the early stage of net pulling, and quickly retract the net in the later stage to reduce the number of fish escaping.

        No matter which fishing method is used, it is necessary to be careful and try to avoid the shedding of scales caused by the struggle of live fish, which may cause damage to the fish body or even death.

        5、 Strengthen post capture management: After the net is used to catch fish in the pond, the activity of fish storage intensifies, the oxygen consumption increases, and the sludge residue in the pond is stirred during the catch process, causing a rapid decrease in dissolved oxygen in the pond water body, which is highly likely to cause oxygen deficiency and floating of fish in the pond. Therefore, after pulling and catching, it is necessary to timely inject new water or turn on an aerator to increase oxygen. At the same time, the entire pool should be sprinkled with quicklime slurry for sterilization and disinfection.

        6、 Prevention before and after fishing: After the white dew, the temperature difference is relatively large, which can easily lead to the outbreak of water mold, rotten skin and body, and white dew plague. Take preventive measures in advance to reduce unnecessary losses, especially when it comes to selling fish. It is important to use more medication to prevent it, so that the skin and fur of the fish are better and the price is higher.

Eight Precautions for Seasonal Net Fishing at Low Temperatures

        The low temperature season (winter and spring) in China is the main period for fishing, either during which adult fish are caught and listed, or during which fish species are caught and released for stocking. The correct fishing method has a certain impact on the next step of aquaculture. Improper fishing can easily lead to the occurrence of fish diseases. In order to ensure the smooth progress of the next step of aquaculture, the most important point to pay attention to is to minimize damage to the fish body during fishing. Therefore, the following issues or eight specific precautions should be taken when fishing:

1、 Remove debris.

Before fishing, pay attention to removing debris. Before fishing, be sure to remove debris such as branches, weeds, etc. from the surroundings and pond to ensure the smooth operation of the net and prevent damage to the net clothing. The wooden stakes, uncleaned large stones, and water hyacinths, water peanuts, etc. set up for anti-theft purposes in the pond can also affect the normal operation of the net. Before catching, it is necessary to remove obstacles in the pond water to facilitate the net pulling operation.

2、 Pay attention to adjusting the water level.

Drainage before capture and irrigation after capture. In low temperature seasons, the water level is generally deep, and sometimes too deep is not conducive to fishing nets. Therefore, attention should be paid to adjusting the water level. Generally, if the pond is not clear, the water level should be adjusted to 1-1.5 meters before fishing. After fishing, if there are still many fish in the pond, the water level should be deepened in a timely manner to increase the water temperature and maintain the safety of commercial fish that do not meet the standards during the winter.

3、 Correct selection of netting equipment.

The correct selection of net gear should be based on the type and size of the fish being caught. In order to ensure the smooth operation of the net, the appropriate net mesh should be determined based on the size of the fish being caught, and too small net mesh should not be used as much as possible. The selected net mesh should preferably be able to catch large fish and small fish to escape, in order to prevent harm caused by catching small fish. 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 twice the depth of the water. The mesh size is determined based on the fishing specifications. If the mesh size is too small, it can also drag up small sized fish, causing unnecessary damage.

4、 The fishing method should be correct and the speed should be fast.

The correct fishing method has a significant impact on the fishing effect. In order to achieve ideal fishing results and save time and effort, the correct fishing method should be adopted. Firstly, select the location for offline and offline screening. To lower the net in shallow water, raise the net in deep water. When there is wind, lower the net in the leeward direction and pull the net against the wind. When dragging the net, the bottom line should form an angle with the bottom of the pool. It is best to have a slope of 30-60 degrees between the edge of the pond where the net is raised and the water surface; Secondly, it is necessary to gently lower the net and quickly lift it. During the early stages of pulling the net, it should be done slowly, and after passing 1/2-2/3 of the pond, the speed should be fast, especially when retracting the net. When lifting the net, it should be done quickly to prevent the fish from escaping or being injured.

5、 Gently lower the net, quickly raise the net.

Before lowering the net, organize the fish net and place it on one side of the pond. Then, gently place the bottom net, net coat, and bottom net along the pond and pull the net from both sides simultaneously. When pulling the net, it is necessary to move slowly within the first half of the water surface of the fish pond. When pulling the net to the second half of the pond surface, it is necessary to quickly retract and lift the net to reduce the number of fish hitting the net and escaping. The trawling personnel on both sides should coordinate their efforts and maintain a uniform speed when dragging, not fast or slow.

6、 Coordinate up and down.

When trawling, the upper mesh is lighter than the lower mesh, and the upper mesh must move with the lower mesh. The upper mesh should be slightly higher than the lower mesh. If the upper class is too close to the back, the fish may easily jump and escape, while if the upper class is too close to the front, it may lead to the lower class leaving the bottom of the pool, causing a "flipping class" and causing a large number of fish to escape. As you approach the net, gradually tighten and raise the upper line to prevent the fish from jumping out.

7、 Avoid continuous netting.

Continuous net pulling can cause damage to fish bodies. Under low temperatures, fish wounds are difficult to heal and are prone to diseases. Therefore, continuous net pulling should be avoided, and the time between two net pulling should generally be at least 7 days apart. Avoid continuous homework on consecutive days. The temperature is low and the resistance of the fish body is poor. If the fish that do not need to be caught are repeatedly injured in a short period of time, the wound is difficult to heal, which will lead to water mold entering and causing the fish to develop a series of fish diseases.

8、 Choose the appropriate weather and timing.

During the low temperature season, fishing can easily freeze and damage fish bodies when the weather is bad. Therefore, it is advisable to choose sunny and warm weather for fishing. If the water quality in the pond is poor, the best time for fishing is in the morning or morning. Try to stop eating for a day before trawling. After fishing, carefully select small fish that do not meet the product specifications, soak them in salt water for 5-10 minutes, disinfect and prevent diseases, and then put them back into the pond.