Key techniques of hot water fishing

In summer and autumn, the fish carrying capacity of intensive culture ponds has reached saturation, and some adult fish have reached the market specifications, which can be put on the market, which is not only conducive to fish growth and large-scale and high-quality fish breeding, but also reduce the fish load in ponds. According to the production practice, the following key technologies should be grasped in catching hot water fish.

1. The fishing time is generally chosen before and after dawn in the second half of the night when the weather is fine, the temperature is cool, the fish do not float, or when the water temperature is low in the morning (the specific time depends on the distance from the market, @ # @ 136 hours / time). At this time, the pull-net pu fish has little impact on the pond fish, and the supply of fresh fish can be put on the market in time. When haze, muggy weather and pond fish have signs of floating head or the occurrence of fish disease, it is not appropriate to draw a net to catch fish so as not to cause a large number of dead fish. Do not pull the net in the evening, otherwise it will cause early convection in the upper and lower water layer, accelerate the consumption of dissolved oxygen in the pool water, and cause the floating head of the pond fish.

Second, the day before fishing, especially in the afternoon, should stop eating or reduce the amount of feed. Do not feed a large amount of concentrate feed to increase the weight of fresh fish on the market. Because the oxygen consumption of fish increases after eating, they jump and flee when catching, which is easy to cause casualties, and the loss often outweighs the gain. A day or two before the catch, the residual bait and debris floating on the surface of the pond should also be removed.

Third, when fishing, sparse nets (also known as screen and four-finger net and five-finger net) should be added to the net. The length of the net generally accounts for about 1/5 of the total net length, and the mesh size of the net is determined by the individual size of the fishing fish, so that fish species that do not meet the listing specifications can be leaked out. When fishing, it is generally in the shallow water, on the limelight, the net is best to choose in the deep water, downwind, in case the fish run aground and suffocate.

Fourth, fishing operations should be meticulous, skilled and brisk. Therefore, when the water temperature is high, the vitality of the fish is strong, the oxygen content is large, and can not bear the density for a long time, while most of the fish caught in the net have to go back to the pond, if they stay in the net for too long, they are easy to be injured or suffocated by lack of oxygen, so after encircling the fish, the small fish in the net that have not yet reached the listing specifications should be released quickly and briskly, and then the large fish on the market should be selected and put back into the pond while selecting the listed fish. Do not blindly choose listed fish and make small fish species stay in the pond in the net due to dense compression and injury or suffocation to death.