Reservoir cage culture ayu technology
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Plecog lossus altivetis is a small economic fish of the annual order, which belongs to the order Acridis, Cucumber, Aromatic, and Ayu. It usually has a body weight of 100-150 grams and a maximum of 250-300 grams. The two species of sweet-smelling fish are of the grazing type and the land-sealing type. The former are distributed in rivers that have estuaries and the latter are distributed in reservoir lakes. Lu seal a sweet fish individual small, poor reproductive performance. The adult sweet fish is of a textile type with a blackish back, a white silvery side, yellow fins at the end of each fin, and a yellow patch over the pectoral fins. Ayu is delicate in flesh and has a delicious taste. There is a cavity full of balsam on the back, which has a strong scent and is highly favored by consumers. It is known as the “king of freshwater fish†and is a rare breed emerging from artificial breeding in recent years. New varieties. Aquaculture Technology Promotion Station of Gutian County, Fujian Province, from March to November 2000, carried out aquaculture in reservoir cages at the Gutianxi Reservoir, achieving an average yield of 12.5 kg/m2, a survival rate of 85%, and a specification of 100 out of the box. - 150 grams / tail of good results. The main breeding methods are described below. 1 Selecting the water area to choose to install the cages in the deep sloping deep water bay in the middle and lower reaches of the reservoir, avoiding the dry season cages, and the second is the small winds and waves, reducing the stress response of the fish population. 2 Net cage structure cage material using 3X2 polyethylene knot net. The cage specifications are 5 meters long, 5 meters wide, and 5 meters deep. There are two kinds of meshes, and the mesh used in the previous period is 1.2 centimeters; the mesh used in the middle and later periods is 2.0 centimeters. The structure of fishing rafts is constructed by foam big floats and pine planks into bridge-type fishing rafts. 3 Selection and stocking of fry 3.1 Selection of fry The choice of migratory type is more common in artificial breeding. There are two kinds of migratory type artificial seedlings and wild seedlings. Wild seedlings vary in size, and are often damaged and prone to stress reactions during harvesting and handling. Therefore, it is advisable to choose artificial seedlings. 3.2 Stocking Specifications and Density Cage culture advocates large-scale stocking. Generally, 5 to 6 cm seedlings with stocking length are preferred. Stocking densities: 100 to 150/m2. 3.3 FRY FRY There are two ways to transport fry. One is to flush oxygen with a nylon bag and the other is to inflate a plastic bucket. At present, cockroaches and plastic buckets are used for pneumatic transport. A cockroach-like plastic bucket can hold 140 kilograms of water and contain 2000-3000 fry (4-6 cm), equipped with a gas head. It is safe to transport within 10 hours. 4 Feeding and Management 4.1 Feeding There is currently no special feed for ayu fish, mainly used as substitute feed for squid and prawn. Since the wild aromafish mainly graze the epiphytic algae on the gravel of Xihe River, appropriate amount of algae powder or green feed should be added in the compound feed. The daily feeding amount is estimated as the weight of the fish body: when the tail body weight of the fish is below 5 grams, it is fed at 10%; when the tail body weight of the fish is between 10 and 30 grams, it is fed at 8%; when the fish body is heavy When more than 50 grams, feed at 5%. The number of feedings per day is 3 times. The specific time is: 05:00 - 06:00 in the morning; 11:00 - 12:00 in the afternoon; and 17:00 - 18:00 in the evening. Ayu habits are greedy, unrestrained, and often cause intestinal rupture and death due to overeating. The principle of sticking to small meals during feeding is the principle. 4.2 Water Quality Management Sweetfish are warm-water fish. The optimum water temperature is 20-25°C. When the water temperature exceeds 25°C, it is easy to cause disease. When the temperature exceeds 28°C, large-scale deaths will occur. In addition to shading the cage during the high temperature season, a submersible pump should also be provided to extract deep low-temperature water from the reservoir for flushing and cooling. The daily pumping time can be arranged between 11 and 14 o'clock. 4.3 Control of fish diseases 4.3.1 Aquatic mildew mainly occurs when the fry is just in the box. The prevention method is to avoid fish injuries as much as possible during handling operations. 5 g/m3 of malachite green can be used for treatment. 4.3.2 The main pathogens of parasitic diseases are: ciliates, flagellates and monogenes. The use of trichlorfon or ferrous sulfate mixture bags can effectively prevent and kill parasites. 4.3.3 Intestinal inflammation should be reduced when the water temperature drops in rainy days. When the disease is mild, it can be recovered naturally after 1 to 2 days of food inactivity. When the disease is serious, 0.5g of norfloxacin, 1 g of furazolidone, 5g of maternal mother can be added per kilogram of bait. Times, continuous 2 - 3 days. 4.3.4 Hepatic and renal hemorrhage mainly occurs during the hot season from June to September. Diseased fish head congestion, redness, anal swelling, abdominal bloody water, liver and kidney enlargement, congestive, acute illness, large amount of death; diseased fish on the surface of the water, convulsions and spin 3 to 4 hours that sink, the death of the disease season can take shade Cooling, meal reduction and other preventive measures. During the treatment, external chlorine-containing disinfectants are used internally to calm the stability, cod liver, and multi-dimensional, and the curative effect is good.