Adjusting the feed ingredients and enhancing the body composition of the salmon one month before winter should timely adjust the proportion of the feed ingredients so that the fat content in the feed increases by 3%-5%, and the protein content decreases by 3%-5%. At the same time, the content of vitamin c and vitamin e in the feed should be appropriately increased to enhance the body's constitution and resistance to diseases. Through intensive feeding for a month or so, the squid is strong and safe for the winter.
When catching the squid, the squid should be caught in time for the 20th day before the squid's overwintering and stopping for food. This will preserve the phytoplankton population advantage in the water and ensure the “oxygen production†ability of the water body in winter. In addition, if there is no nesting carp in the pond, the carp should be replaced at the same time as the carp is caught in order to control the growth of zooplankton and prevent zooplankton from forming a population advantage and consume large amounts of oxygen and ingest phytoplankton. - General stocking of large-size catfish species in the current year was the best, 50-150 stocks per 0.067 hectare.
Stir the bottom mud and fully aerate the fish pond bottom mud 3-5 times before winter to let the sediment fully aerate so that the reducing material in the bottom mud is fully oxidized, reduce the oxygen consumption during the winter, and at the same time, fertilize the water quality. . Stir bottom mud should be carried out in the sunny morning. It is forbidden to perform on rainy days or in the afternoon. Otherwise it will cause pan fish to die. Stir the bottom mud by pulling the net, pull the shovel, tow rope and other methods. You can only pull it one at a time, not repeatedly, and operate slowly and evenly. It is usually stirred every 4-7 days.
Pull nets to exercise, grading points pool to enhance the squid physique, before the winter can pull nets to exercise several times, while the different specifications of the fish stocking. Pull the net should pull a half pool or 1/3 pool, the action should be light and slow. The fish should be returned to the pool as soon as possible after the net has been set up. When the fish is released, the fish with too small or too large size may be picked out from the other pool for holding or selling. The time for putting the fish and picking the fish should not exceed 1 hour. In addition, the practice of pulling nets, stirring the bottom mud, and fishing for salmon can be combined. The pull time should be chosen from 9-11 am on sunny days.
Deepen the water level, and disinfect the body of water for 5-7 days before it stops eating. The pool water can be added at one time to meet the wintering water level requirements. Water sources use external water as a crime. If it is well water, the water body should be brought into full contact with the air through the circulation ditch and then into the fish pond, or a wooden board be fixed on the edge of the pool so that the water column hits the wood board and fully falls in contact with the air and falls into the pool. 1-2 days after adding water, apply strong chlorine or chlorine-rich 0.310-6 to disinfect. Since then, after the eel has stopped feeding, sprinkle pesticides 1-2 times before freezing to kill parasites and large zooplankton, prevent fish diseases, and reduce oxygen consumption.
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