Common ponds can be used for bracken breeding in Brazil. Among them, sunny ponds with plenty of water, fresh water, no pollution, and convenient drainage and drainage are preferred. The area is 600-3000 square meters, and the maximum is 6500 square meters. The water depth is 1.2-1.8 meters. It is appropriate. Before the fish species are stocked, the conventional clear pond fertilizer and water treatment is performed and an aerator is equipped. (1) Stocking of fish species When brazilian catfish species are stocked, it is required that the water temperature be stable above 15°C, generally at the end of April or early May. It is recommended that stocks with a length of about 15 cm and a weight of 40-45 g be of 1000-1200 tails per mu for winter-aged fish. In order to make full use of water space and food organisms, about 200 species of flowers and white bream species can also be reared; for example, species of summer broodstock that are stocked with Brazilian razor clams, the density can be 1200-1400 tails/mu, and flowers and white storks can be planted at the same time. About 100 fish species. All fish species were soaked with 10 mg potassium permanganate per liter for about 30 minutes before disinfection. After the fish are stocked, feeds are started. The protein content in the feed is required to be 25% - 30%, and it is preferable to feed the whole price pellet feed of quail and cod. The specific feeding amount should be determined according to the size of the fish body, water temperature, feeding intensity and other factors. The general feeding amount is 3% to 5% of the fish's body weight, which is fed twice a day, that is, 8:00-9:00 in the morning and 5:00-6:00 in the afternoon, in which the amount of feeding in the afternoon is larger, accounting for 2/3 of the day. Because Brazil is not as good as squid and tilapia, the feeding time should be longer, about 40-60 minutes. The body length and weight of the fish are generally measured every 20 days in order to adjust the feeding amount in time. (2) Day-to-day management Adhere to the patrol pond on a daily basis to observe the fish’s food intake, activities, and water quality, and identify problems in a timely manner. In the early morning, we mainly observe the movement of fish and whether there are floating heads; in the afternoon, we check the fish’s feeding and activity; in the evening, we check whether there is residual feeding or whether there are signs of floating heads. During the high summer season in midsummer, the weather often mutates. Fishes are prone to floating heads, and they should be patrolling the pond in the middle of the night. Since the fastest growing stage of Brazilian cockroaches is in June-September, and coincides with the high-temperature season, as the amount of food added increases, excreta increases, and pool water tends to turn fat and deteriorate. If the pool is too thick, yellow, black, fresh water should be added in time and the aerator should be turned on to adjust the water quality. It is also possible to adjust the pond water fertility through reasonable feeding and use of quick lime to keep the water quality fat and live. , tender, cool; if the pool is oily green, brown, not turbid, transparency is about 30 cm, you do not have to change the water. In addition, it is possible to improve the water quality and increase the vegetal food by feeding it regularly. (3) Fish Disease Prevention and control of Brazilian aphids is strong. In addition to the infection of aquatic fungi due to operational damage during low water temperature, no fatal or influential fish diseases have been found in the adult fish breeding stage. Disease, resulting in weight loss of the fish, and even a large number of deaths, the disease can occur when 0.5ppm copper sulfate and 0.2ppm of ferrous sulfate Quanchiposa; fish stage susceptible to white skin disease, available 0.3ppm strong chlorine Quanchiposa, there Better results. In artificial breeding, fish ponds can be soaked with 10ppm potassium permanganate for about 30 minutes or furazolidone 2ppm for 20-30 minutes to sterilize. The specific bath time depends on the tolerability of the fish. During the cultivation process, 10 ppm quick lime is splashed every 20-25 days to prevent disease and regulate water quality. On the day of fry stocking, Quanchiposa Fish and Pepper 0.5ppm and furazolidone 0.2ppm (alternative use of the two drugs) are used once a day for 4 days to prevent fish diseases. Brazilian earthworms are very sensitive to organophosphorus pesticides such as trichlorfon and malachite green. Therefore, the use of such drugs should be banned in the prevention and treatment of fish diseases. Furazolidone, terramycin, and methylene blue can be used with caution. Buster, strong chlorine.
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