First, the benefits of arrest: (1) is conducive to the benign turnover of funds. Through the acquisition and acquisition of fish, shrimp, and other adult products that meet the marketing specifications, it will increase investment in the later period of the cultivation, avoiding the gradual investment in traditional breeding methods, one-time recycling, and the disadvantage of occupying too much money and reducing investment. risk. (2) It facilitates the rapid growth of small-size individuals. After arresting large individuals with strong competition for food, small-scale individuals can obtain more food and more space, which can speed up the growth and increase the total output of the culture. (3) It helps to improve feed utilization. In general, with the growth of individuals, the growth rate of aquaculture animals will gradually slow down, the utilization rate of feed will decline, and the feed coefficient will increase significantly, virtually increasing the cost of breeding. Therefore, for adults who meet the market specifications, they must be caught and listed in due course. (4) It helps to improve the safety of culture. As a result of the capture of some aquaculture products, their density has decreased, and the accident of death of dead fish due to lack of oxygen, diseases, etc. has been avoided, which is also conducive to nursing care management. (5) It is conducive to regulating market supply. In the summer and autumn, part of the market’s fresh aquatic products was provided, changing the past restocking, and the end of the year focused on the uneven supply and distribution of fishery supplies and the falling prices. Second, the catch of the species and time: (1) eel, eel. It is generally conducted from the beginning of June to the end of June and the second half of July and the end of August and the end of August and the beginning of September. It will reach 0.5 kilograms of eel and squid and will reach 1.25 kilograms of grass carp and 0 More than .3 kilograms of salmon are listed for sale. (3) tilapia, leather moustaches and so on. In order to prevent the temperature of the cold water from turning, tropical fish such as tilapia and leather beards will be frozen to death. They can be harvested several times in late August from the end of October to mid-to-late October. (4) Carp. At present, the common carp, such as silver carp, accounts for a relatively large proportion in breeding. Round-up hunting is an effective measure to increase output. Generally, it can be harvested and sold from the end of April. It can be caught 5 to 6 times a year, or caught 1 to 2 times a month. (5) Green shrimp. Green shrimp have a short lifespan and multiple spawning habits, which is particularly important. This can be done by round-robin method. It can also catch some shrimp and prawns of some sizes during May-June (commonly known as 'powder shrimp'), and from the end of June to mid-July (commonly known as 'meat to shrimp'). Male) listed. (6) Tropical shrimp. Macrobrachium rosenbergii, new amount of shrimp, P. vannamei and other tropical shrimps have the characteristics of strict temperature requirements and rapid growth, and they must begin to gradually catch and reach the specifications of the shrimp market about one month before the minimum temperature limit. (7) crabs. The crabs are seasonal aquatic products. They are usually caught before and after the “Chongyang†festival. However, in recent years, in order to regulate the market, farmers have also tested the crabs listed in the April-August month. The price is 2 to 3 times when listed on the market. (8) Other aquatic products. The special aquatic products such as loach, yellow peony, black peony, and soft-shelled turtle should also be subject to round-robin and listing measures based on market conditions and breeding density. Third, the capture method: (1) pull the net method. This is the most common method of round fishing and shrimp. Before catching, the fish and shrimp were stopped for 1 day, and when they were arrested, a small amount of feeding was conducted for 5 to 15 minutes and the fish and shrimp were baited in the food field. Clean up the nets, use the boat to gently pull the nets into the pool, surround the food market, and then tighten the nets. After the nets are taken to the beach, they will be picked up in the deep water and sorted. Sink the upper part slightly into the water and allow the small-sized fish to swim out. (2) trapping method. Use some fish to reverse the habit of water trapping fish trap. The method is to dig a ditch with a width of 1 meter and a length of 15 meters on the bank of the pond. It can also be expanded as needed. The depth of the ditch should be equal to or slightly higher than the surface of the pond, and the rear end of the ditch should communicate with the pond. At the time of arrest, put a plastic film in the ditch and use a water pump to put water at the front of the ditch. When the water flows into the pond from the back end of the ditch, the fish will turn against the water and concentrate in the ditch. At this time, they can be in the ditch. Select according to the listing requirements. (3) Zhang capture method. When catching the squid, you can use the “flower blue†to catch it. Put the “flower basket†in the pool on the first night and sprinkle a small amount of fish to eat the food. In the morning, lift the “flower basket†to pick fish in the cabin. When catching fresh shrimps or crabs and certain fish, they can be caught by “fling nets†and “ground cages.†Both types of fishing gear are provided with “poured mustsâ€, and fish and shrimp cannot enter after entering, and they are put in every night. In the pool, fishing and shrimp are collected in the early hours of the next day, and they can also be collected several times a day. (4) hook fishing method. When catching a small amount of cultivated Astragalus, black peony and other species, this method can be used. The method is to use bait, quail meat and other bait, catch in the wormhole, and use small frogs and small fish as bait for fishing. (5) gill net method. It is suitable for catching large lakes such as lakes, reservoirs and rivers. During the operation, a long band-shaped net is used, which is laid vertically in the vicinity of the food field, so that the fish can be caught in the mesh or caught on the net. (6) Lifting method. Mesh nets, ropes, pulleys, and bamboo poles are used to make a set of fixed nets. The nets are laid on the bottom of the pool and the nets are trained to eat fish so that the fish can develop habits of eating on the net. A small amount of food is fed in the net for 10 to 15 minutes. When the fish enters the net, the net is quickly lifted by means of the ropes on the pulley, and the fish is then picked. (7) Diversion method. When catching shrimp, you can use a net to make a copy under water and other attachments. Fourth, pay attention to the arrest: Summer, autumn fishing, shrimp, said "hot water fish." Due to the high temperature and water temperature at this time, aquatic animals such as fish and shrimps have high activity and high oxygen consumption and should not be intensive and operate for a long time. Therefore, special attention must be paid when fishing to avoid slow operation or carelessness. Casualties. (1) Choose the right time. Must choose the normal weather, relatively cool, when the fish does not float head. It is usually caught in the middle of the night until dawn and fish supplies can be supplied to the market in time. The weather is hot and thundery, the fish floating head or the floating head will not be caught, so as to avoid dead fish. (2) Preparation before catching. Arrange skilled operators and do a good job of division and cooperation. The amount of feeding should be appropriately reduced on the day before fishing to avoid fear of jumping and death of the fish after eating. Before the cuttings, remove the grassy scum dirt from the water surface so as not to affect the operation. At the same time, we must prepare necessary tools such as cages, picking buckets, and aeration equipment. In particular, we must connect sales channels. (3) Be cautious. When fish are crowded, they should quickly and swiftly pick up the fish that have not reached the market size, so that they will not be injured or die due to excessive concentration, or affect the growth of the later stage. When sorting, do not use too many one-time quantities. The operation should be skillful, fast, and accurate. Don't fish fish by hand, especially don't fish. (4) Post-catching treatment. After the cuttings, due to the mud in the bottom of the tank, the water quality is muddy and the organic matter in the water increases. It is very easy to cause the fish to float due to lack of oxygen. Therefore, a large amount of water must be added to the pump or the aerator be used to increase oxygen. The pond should be disinfected with disinfectant on the next day to prevent infection after fish body damage.
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