In summer, intensive fish ponds have reached saturation levels. At this time, some of the adult fish have reached the market specifications and should be caught and listed in a timely manner. This will not only facilitate the growth of fish and the cultivation of large-size and high-quality fish species, but also reduce the fish load on the pond. Summer fishing should grasp the following key technologies:
First, the fishing time should generally be selected in good weather, cool temperatures, before and after the dawn of the fish is not floating or when the water temperature in the morning is low (the specific time can be determined according to the distance from the market, sales time) because at this time The impact of pond fish is small, but it can timely supply the caught fresh fish to the market. In the case of haze and sultry weather, pond fish have signs of floating head or fish disease, etc., it is not suitable to pull net fishing, otherwise it will cause a large number of dead fish. In the evening, it is impossible to pull the net, because at this time, pulling the net will cause the convection of the upper and lower water layers to accelerate the consumption of dissolved oxygen in the pool water, causing the fish to float.
Second, the day before fishing, especially in the afternoon should be stopped or reduce the amount of feed, should not be added to increase the weight of listed fresh fish and concentrated feed concentrate feed. Because of the increase in oxygen consumption after a fish's satiety, they are frightened to jump and flee at the time of catching. This can easily lead to casualties, which often outweigh the benefits. One or two days before catching, the residual bait in the pond and the debris floating on the water should also be removed.
Third, thinning nets (also known as screens and four-finger nets, five-finger nets) should be added to the net during fishing. The length of thin nets generally accounts for about one-fifth of the total net length, and the size of dilute nets is the minimum size for catching fish. However, in order to be able to leak out of product specifications fish species. At the time of fishing, the nets are usually in shallow water and upwards, and the net is best to choose in deep water and downwind, so as to prevent the fish from suffocating.
Fourth, fishing operations should be meticulous, skilled and light. At this time, the water temperature is high, the fish's vigor is strong, the oxygen consumption is large, and it is impatient for a long time. Most of the fish caught in the net have to return to the pool. If they stay in the net for too long, they are easily injured or die of oxygen deprivation. Therefore, after the fish is surrounded, the net should not be quickly and swiftly put into the market. The small fish release, and then pick the listed fish, or return to the pond when you select the listed fish, do not blindly select the listed fish and small ponds pond species in the net, due to compression injury or suffocation.
5. Immediately after fishing, new water or aerators should be added. The activities of the fish are intensified and the oxygen consumption is increased. In addition, when the net is pulled, the mud at the bottom of the pond is agitated, and the organic matter at the bottom is turned up, which accelerates the rate of oxidative decomposition. The oxygen consumption is greatly increased, so the dissolved oxygen in the pool water will rapidly decrease, and the pond fish are susceptible to lack of oxygen. At the same time, the fish is stimulated to secrete a large amount of mucus, which needs to be flushed with fresh water or aerobic machine to increase oxygen, so that the fish has a period of top water to wash away excess mucus, increase dissolved oxygen, and prevent floating head. For example, during the day, you should add water or aerator for about 2 hours. After catching fish at night, add water or aerator. Wait until the sunrise or the fish do not float to stop the machine.
First, the fishing time should generally be selected in good weather, cool temperatures, before and after the dawn of the fish is not floating or when the water temperature in the morning is low (the specific time can be determined according to the distance from the market, sales time) because at this time The impact of pond fish is small, but it can timely supply the caught fresh fish to the market. In the case of haze and sultry weather, pond fish have signs of floating head or fish disease, etc., it is not suitable to pull net fishing, otherwise it will cause a large number of dead fish. In the evening, it is impossible to pull the net, because at this time, pulling the net will cause the convection of the upper and lower water layers to accelerate the consumption of dissolved oxygen in the pool water, causing the fish to float.
Second, the day before fishing, especially in the afternoon should be stopped or reduce the amount of feed, should not be added to increase the weight of listed fresh fish and concentrated feed concentrate feed. Because of the increase in oxygen consumption after a fish's satiety, they are frightened to jump and flee at the time of catching. This can easily lead to casualties, which often outweigh the benefits. One or two days before catching, the residual bait in the pond and the debris floating on the water should also be removed.
Third, thinning nets (also known as screens and four-finger nets, five-finger nets) should be added to the net during fishing. The length of thin nets generally accounts for about one-fifth of the total net length, and the size of dilute nets is the minimum size for catching fish. However, in order to be able to leak out of product specifications fish species. At the time of fishing, the nets are usually in shallow water and upwards, and the net is best to choose in deep water and downwind, so as to prevent the fish from suffocating.
Fourth, fishing operations should be meticulous, skilled and light. At this time, the water temperature is high, the fish's vigor is strong, the oxygen consumption is large, and it is impatient for a long time. Most of the fish caught in the net have to return to the pool. If they stay in the net for too long, they are easily injured or die of oxygen deprivation. Therefore, after the fish is surrounded, the net should not be quickly and swiftly put into the market. The small fish release, and then pick the listed fish, or return to the pond when you select the listed fish, do not blindly select the listed fish and small ponds pond species in the net, due to compression injury or suffocation.
5. Immediately after fishing, new water or aerators should be added. The activities of the fish are intensified and the oxygen consumption is increased. In addition, when the net is pulled, the mud at the bottom of the pond is agitated, and the organic matter at the bottom is turned up, which accelerates the rate of oxidative decomposition. The oxygen consumption is greatly increased, so the dissolved oxygen in the pool water will rapidly decrease, and the pond fish are susceptible to lack of oxygen. At the same time, the fish is stimulated to secrete a large amount of mucus, which needs to be flushed with fresh water or aerobic machine to increase oxygen, so that the fish has a period of top water to wash away excess mucus, increase dissolved oxygen, and prevent floating head. For example, during the day, you should add water or aerator for about 2 hours. After catching fish at night, add water or aerator. Wait until the sunrise or the fish do not float to stop the machine.
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