When is the best time to fish in dog days?

In summer, the carrying capacity of fish in intensive ponds reaches saturation. At this time, some adult fish have reached the market specifications, so they should be caught and listed in time, which is not only conducive to fish growth and cultivation of large-scale and high-quality fish species, but also can reduce the fish load in the pond. Summer fishing should master the following key techniques:

First, the fishing time should generally be chosen around dawn when the weather is clear, the temperature is cool and the fish are not floating, or when the water temperature is low in the morning (the specific time can be determined according to the distance from the market and the sales time), because trawling has little effect on pond fish at this time, and the caught fresh fish can be supplied to the market in time. In cloudy and sultry weather, when there are signs of floating heads or fish diseases in the pond, it is not advisable to pull nets for fishing, otherwise a large number of dead fish will be caused. You can't pull the net at night, because pulling the net at this time will cause convection in the upper and lower water layers in advance, accelerate the consumption of dissolved oxygen in the pool water, and cause the fish in the pool to float.

Two, the day before fishing, especially in the afternoon, should stop eating or reduce the amount of feeding, and avoid feeding a lot of concentrated feed to increase the weight of fresh fish in the market. Because the oxygen consumption of fish increases after eating, it is easy to cause casualties when fishing, and it is often not worth the candle. One or two days before fishing, the residual bait in the pond and the floating debris on the water surface should also be removed.

Third, when fishing, you should add fine nets (also known as sieve, four-finger net and five-finger net) online. The length of the fine net generally accounts for about one-fifth of the total net length, and the mesh size of the fine net depends on the minimum specifications of the caught species, so that fish species that do not meet the commercial specifications can be missed. When fishing, the net is generally in shallow water and upwind, and it is best to close the net in deep water and downwind to prevent the fish from being stranded and suffocated.

Four, salvage operations should be meticulous, skilled and light. At this time, the water temperature is high, the fish has strong vitality and high oxygen consumption, and it is unbearable for long-term density. Most of the fish caught in the net will return to the pond. If they stay in the net for too long, they will easily get injured or die of lack of oxygen. Therefore, after the fish are enclosed, the small fish that have not reached the market specifications in the net should be released quickly and briskly, and then the big fish that have been listed should be selected, or the fish that have been listed should be put back into the pond while selecting. Don't blindly choose small-sized fish that have been left in the pond, crushed or suffocated.

5. After fishing, add fresh water or start the aerator immediately. The activity of fish will intensify and the oxygen consumption will increase. Moreover, when pulling the net, the mud at the bottom of the pond will be stirred, and the organic matter at the bottom will turn up, which will accelerate the oxidation and decomposition and greatly increase the oxygen consumption. Therefore, the dissolved oxygen in the pond water will decrease rapidly, and the fish in the pond will easily float due to lack of oxygen. At the same time, it stimulates the fish to secrete a lot of mucus, so it is necessary to inject fresh water in time or start the aerator to aerate, so that the fish can have a period of top water time to wash away excess mucus, increase dissolved oxygen and prevent floating head. If fishing during the day, add water or turn on the aerator for about 2 hours; After fishing at night, add water or turn on the aerator, and stop until sunrise or the fish does not float.