First, choose the fishing time. When catching, choose before and after the dawn of the day and the fish is not floating. At this time, the impact of fishing on the fish is minimal, and the fresh fish caught can be supplied to the market in time. In the case of haze, sultry weather, and floating fish or fish disease, it is not appropriate to pull nets to avoid causing a large number of dead fish, resulting in unnecessary economic losses. Second, stop eating or feeding before catching. The day before fishing should be stopped or reduce the amount of feed, should not be added to increase the weight of listed fresh fish weight feed concentrate. Because the oxygen consumption of fish after eating is increased, they are frightened to jump and flee when catching, which can easily cause casualties. One or two days before catching, it is also necessary to eliminate the leftover bait in the pond, as well as various debris and waste floating on the surface of the water. Third, pay attention to fishing methods. Larger ponds with denser fish should not be caught in the whole pond. It is advisable to catch a half pond or a 1/3 pond. Therefore, when the water temperature is higher, the fish is more active and consumes more oxygen. Insufficient density, surrounded by too many fish, the most likely to cause dead fish. Pull the net quickly and carefully to minimize the noise so as not to alarm the fish. After the fish is surrounded, the small fish that have not yet reached the product specifications should be quickly and lightly picked back into the original pool, and the listed fish should be selected to prevent the small fish from being damaged or suffocated by dense crowding, resulting in loss. Fourth, management after fishing. After catching the pond, the fish activity increased and the oxygen consumption increased. During the capture, the silt residue on the bottom of the pond was agitated. The bottom organic matter turned up, which accelerated the rate of oxidative decomposition and greatly increased the oxygen consumption. Therefore, the pool water dissolved. Oxygen will rapidly decrease, and it is very easy to cause oxygen-depleted floating heads in fish ponds. It is necessary to flush new water or activate aerators to increase oxygen. It is also possible to disperse and sterilize raw lime slurry in Quanchipi to improve and regulate water quality to ensure the safety of fish. Unexpected occurrence.
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