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What are the precautions for autumn harvesting of pond fish?

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First, pay attention to the weather conditions. In autumn, seining and harvesting must be done on a sunny day with cool weather, around dawn before the pond fish come to the surface for air. At this time, the impact on the pond fish is minimal, and the freshly caught fish can be supplied to the morning market in time. Hazy and muggy weather is not suitable for seining fish, as it may cause a large number of fish deaths. In addition, when the fish in the pond are gasping at the surface or there is an outbreak of fish disease, seining and harvesting should also be avoided. Second, restrict feeding before harvesting. After fish eat their fill, their oxygen consumption increases, and when seining and harvesting, they are startled, jump and dart about, which easily causes injury and death. Therefore, before seining and harvesting

First, pay attention to the weather conditions. In autumn, seining and harvesting must be done on a sunny day with cool weather, around dawn before the pond fish come to the surface for air. At this time, the impact on the pond fish is minimal, and the freshly caught fish can be supplied to the morning market in time. Hazy and muggy weather is not suitable for seining fish, as it may cause a large number of fish deaths. In addition, when the fish in the pond are gasping at the surface or there is an outbreak of fish disease, seining and harvesting should also be avoided.

Second, restrict feeding before harvesting. After fish eat their fill, their oxygen consumption increases, and when seining and harvesting, they are startled, jump and dart about, which easily causes injury and death. Therefore, one day before seining and harvesting, feeding should be stopped or the amount fed should be reduced. Do not feed large amounts of concentrated feed just to increase the body weight of the fresh fish going to market, otherwise the loss will outweigh the gain. In addition, one or two days before seining and harvesting, residual feed and leftover bait in the pond, as well as debris floating on the water surface, should also be removed.

Third, master the seining method. For ponds with a relatively large area and a relatively dense stock of fish, it is not advisable to seine the entire pond; seining half the pond or 1/3 is preferable. Because the water temperature is relatively high, the pond fish are highly active and consume a lot of oxygen, and they cannot tolerate crowding. When there are too many fish in the seine net, it is most likely to cause injury and death among the fish. When seining and harvesting, be quick and careful, and minimize noise to reduce disturbing the pond fish. After the fish are gathered together, first quickly and gently release the small fish in the net that have not yet reached market size back into the original pond, and then sort out the large fish for market, so as to avoid the small fish being squeezed, injured, or suffocated to death.

Fourth, strengthen post-harvest management. In a pond after seining and harvesting, the remaining fish become more active and their oxygen consumption increases, and during the seining and harvesting process the mud and residue at the bottom of the pond are stirred up, organic matter at the bottom is turned up, and the rate of oxidative decomposition accelerates, greatly increasing the consumption of dissolved oxygen and causing the dissolved oxygen in the pond water to drop rapidly, which very easily causes the fish in the pond to suffer from hypoxia and gasp at the surface. Therefore, after seining and harvesting, promptly add fresh water or turn on an aerator to increase oxygen. At the same time, also splash quicklime slurry over the whole pond for sterilization and disinfection, so as to improve and regulate water quality.

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