Triangular 鳊, common name 鳊, scientific name flat chest 鲂. It belongs to the order of Oystercatcher, Odontosidae, Aphids, and Oystercatchers. It is distributed in rivers and lakes in the northeast, southeast, and southern provinces of China. Fujian Province is mainly produced in the streams of the Lancang River and Mulan Stream. Trichosanthes is a omnivorous fish dominated by plant foods. Generally a body weight of 1-1.5 kg, the largest body weight of more than 5 kg. The meat is delicate and delicious, comparable to that of Wuchang fish, and it is a fine economic fish. The trifoliate larvae have fast growth speed, large individuals, high population output, good meat quality, high prices, and eating artificial feed. In recent years, Fujian Oceanic and Fisheries Bureau has listed it as a major new breed of artificial breeding. The Gutian County Aquatic Technology Promotion Station in Fujian Province took full advantage of the Dashui surface resources of the Gutianxi Reservoir and Shuikou Power Station Reservoir (aquaculture water in the two major reservoirs amounted to 6400 hectares), and vigorously promoted the reservoir cage culture triangle. In 2001, Gutian County cage culture triangle More than 2,000 cartons. The main farming methods are introduced as follows:
First, the choice of waters 1. Choose to set up fishing rafts in deep reservoirs near villages and houses. One can be easy to manage, and the other is to avoid a dry period cage.
2. Choose Xiangyang lee, the original reservoir is farmland or flat open-air waters. This type of water quality fertilizer is relatively rich in natural food.
3. Select the water area within 0.1m/s away from the fairway and pier. Such waters are relatively quiet and can reduce the stress response of fish schools.
4. The upper reaches and surrounding waters of chemical fertilizer plants, pesticide plants, paper mills and other pollution sources should not be selected.
Second, the production of cage 1, cage material: 33 polyethylene knot net.
2, cage specifications: a hexahedral closed cage with lid. The box is 4 meters long, 3 meters wide and 3 meters deep; the mesh is 3 centimeters.
3. The structure of fishing rafts: Constructed by bridges with large foam floats and pine planks. In general, a fishing boat installs 20-50 cages.
3. Installation of cages 1. Fixation of cages: The corner cords of the upper four corners of the cage are ligated on the four inner corners of the pine plank frame, and the other cage is fixed with 46 polyethylene wires around the upper part of the cage. On the side of the frame, 2-3 kilograms of pebbles or sandbags are hung on the four corners of the cage to allow the cage to be fully formed in the water.
2. Feed table production: 40-mesh screen cupboard and 6-mm-diameter steel bar are used to make a square feed pad measuring 2 meters and 2 meters high and 0.2 meters high. The feed table is hung in the corner of the cage, which is based on the bottom of the box.
3, cage water time: cages should be installed in the fish into the box 7 days before the installation of water, so that the mesh algae epiphyses become smooth, in order to avoid fish skin, scales friction damage.
IV. Stocking of fingerlings 1. Specification and density of stocking: In order to increase the survival rate and breeding efficiency of fingerlings, it is generally advisable to raise large-scale fingerlings with an individual tail weight of 50 grams or more. 50-foot tail, stocking 100-120 square meters per square meter, tail weight of 100 grams of 80-100 per square meter stocking.
2. Training and hanging up of fingerlings: Starting from the first 10 days before leaving the pond, when feeding the feed, add Vc1g per kilogram of feed to improve the immune function and anti-stress ability of the fingerlings. Before the fish species come out of the pond, the net should be trained 2-3 times; on the day before the start of the fish species, they should be raised in fish cages for 24 hours. This will reduce the loss of fish species in the transport process, and improve the Survival rate.
3. Disinfection of fingerlings: The salt bathing method is effective and safe. Salt concentration 3% - 5%, bath time 5 - 10 minutes, depending on the temperature and fish tolerance at that time and flexible control. Bathing can be performed in a canvas bucket or in a cabin that is filmed.
Fifth, feed feeding 1, feed selection: In the entire breeding process, all use special pellets. The pellets are mainly made of fish meal, rapeseed cake, bran, etc., and are made into small-sized hard pellet feed machines with different particle size (1-1.5 mm particle size) and adult fish (particle size 2.5 - 3.5 mm). The content of animal protein in the pellets can reach about 26%.
2. Feeding method: In the initial stage of breeding, fish feed is fed, and the daily feeding amount is 5% to 7% of the fish's body weight. In the middle and late breeding period, the adult fish is fed, and the daily feeding amount is 3% of the fish's body weight. - 5%. The number of feedings per day is 3 times. In actual operation, it is also necessary to adjust flexibly according to the weather, water temperature, and food intake. Generally, it is appropriate to eat about 1 hour per feed.
6. Routine management 1. Scrubbing cages: Wash the cages once every 7-10 days to prevent clogging of the mesh and affect the flow of water inside and outside the cage.
2. Wash the feed table: Check and clean the feed table every morning to prevent the leftover bait from rot and water. At the same time, the amount of bait on the day is determined based on the amount of leftover bait.
3, to prevent the escape of fish: Every day should be carefully observed, check the cage is damaged, slippery, if any should be repaired at any time.
VII. Prevention of Fish Diseases Cage culture Triangle diseases are mainly susceptible to: red skin disease, water mold disease, gill disease, and enteritis disease.
1. Preventive Measures (1) Disinfection of Feeding Table Hanging Bags: Use woven sachets, each containing 100-150 grams of bleaching powder or copper sulphate, hung over the feed table, and hang one bag per carton before adding the drug solution. Bleach and copper sulfate can be used interchangeably.
(2) Regular disinfection of the water: around the cage, use 25-30 mg/L lime or 1 mg/L chlorine dioxide every two weeks to pour water, once a day for 2-3 days.
2. Treatment methods (1) Red skin disease: Each onset cage is sprayed with 4-5 grams of chlorine dioxide, once a day for 3 consecutive days; and ciprofloxacin is taken orally, and ciprofloxacin is added per kilogram of feed. 1-1.5 grams, continuous feeding for 3 days.
(2) Saprovirus: The diseased fish is soaked in 0.4-hour baking soda and salt solution for 20-30 minutes.
(3) Gill disease: Each epidemic cage is splashed with 800-1000 g quick lime, once a day for 3 consecutive days; Furanus is taken orally, 5 g of Furanus is added per kilogram of feed and continuously fed for 3 days. .
(4) Intestinal disease: Furazolidone 0.5 g + 1 kg norfloxacin + 5 g of maternal mothers per kilogram of feed is continuously fed for 3 days, or 3 g of allicin + 1 g of fluoric acid per kilogram of feed is added. , continuous feeding for 3 days.
First, the choice of waters 1. Choose to set up fishing rafts in deep reservoirs near villages and houses. One can be easy to manage, and the other is to avoid a dry period cage.
2. Choose Xiangyang lee, the original reservoir is farmland or flat open-air waters. This type of water quality fertilizer is relatively rich in natural food.
3. Select the water area within 0.1m/s away from the fairway and pier. Such waters are relatively quiet and can reduce the stress response of fish schools.
4. The upper reaches and surrounding waters of chemical fertilizer plants, pesticide plants, paper mills and other pollution sources should not be selected.
Second, the production of cage 1, cage material: 33 polyethylene knot net.
2, cage specifications: a hexahedral closed cage with lid. The box is 4 meters long, 3 meters wide and 3 meters deep; the mesh is 3 centimeters.
3. The structure of fishing rafts: Constructed by bridges with large foam floats and pine planks. In general, a fishing boat installs 20-50 cages.
3. Installation of cages 1. Fixation of cages: The corner cords of the upper four corners of the cage are ligated on the four inner corners of the pine plank frame, and the other cage is fixed with 46 polyethylene wires around the upper part of the cage. On the side of the frame, 2-3 kilograms of pebbles or sandbags are hung on the four corners of the cage to allow the cage to be fully formed in the water.
2. Feed table production: 40-mesh screen cupboard and 6-mm-diameter steel bar are used to make a square feed pad measuring 2 meters and 2 meters high and 0.2 meters high. The feed table is hung in the corner of the cage, which is based on the bottom of the box.
3, cage water time: cages should be installed in the fish into the box 7 days before the installation of water, so that the mesh algae epiphyses become smooth, in order to avoid fish skin, scales friction damage.
IV. Stocking of fingerlings 1. Specification and density of stocking: In order to increase the survival rate and breeding efficiency of fingerlings, it is generally advisable to raise large-scale fingerlings with an individual tail weight of 50 grams or more. 50-foot tail, stocking 100-120 square meters per square meter, tail weight of 100 grams of 80-100 per square meter stocking.
2. Training and hanging up of fingerlings: Starting from the first 10 days before leaving the pond, when feeding the feed, add Vc1g per kilogram of feed to improve the immune function and anti-stress ability of the fingerlings. Before the fish species come out of the pond, the net should be trained 2-3 times; on the day before the start of the fish species, they should be raised in fish cages for 24 hours. This will reduce the loss of fish species in the transport process, and improve the Survival rate.
3. Disinfection of fingerlings: The salt bathing method is effective and safe. Salt concentration 3% - 5%, bath time 5 - 10 minutes, depending on the temperature and fish tolerance at that time and flexible control. Bathing can be performed in a canvas bucket or in a cabin that is filmed.
Fifth, feed feeding 1, feed selection: In the entire breeding process, all use special pellets. The pellets are mainly made of fish meal, rapeseed cake, bran, etc., and are made into small-sized hard pellet feed machines with different particle size (1-1.5 mm particle size) and adult fish (particle size 2.5 - 3.5 mm). The content of animal protein in the pellets can reach about 26%.
2. Feeding method: In the initial stage of breeding, fish feed is fed, and the daily feeding amount is 5% to 7% of the fish's body weight. In the middle and late breeding period, the adult fish is fed, and the daily feeding amount is 3% of the fish's body weight. - 5%. The number of feedings per day is 3 times. In actual operation, it is also necessary to adjust flexibly according to the weather, water temperature, and food intake. Generally, it is appropriate to eat about 1 hour per feed.
6. Routine management 1. Scrubbing cages: Wash the cages once every 7-10 days to prevent clogging of the mesh and affect the flow of water inside and outside the cage.
2. Wash the feed table: Check and clean the feed table every morning to prevent the leftover bait from rot and water. At the same time, the amount of bait on the day is determined based on the amount of leftover bait.
3, to prevent the escape of fish: Every day should be carefully observed, check the cage is damaged, slippery, if any should be repaired at any time.
VII. Prevention of Fish Diseases Cage culture Triangle diseases are mainly susceptible to: red skin disease, water mold disease, gill disease, and enteritis disease.
1. Preventive Measures (1) Disinfection of Feeding Table Hanging Bags: Use woven sachets, each containing 100-150 grams of bleaching powder or copper sulphate, hung over the feed table, and hang one bag per carton before adding the drug solution. Bleach and copper sulfate can be used interchangeably.
(2) Regular disinfection of the water: around the cage, use 25-30 mg/L lime or 1 mg/L chlorine dioxide every two weeks to pour water, once a day for 2-3 days.
2. Treatment methods (1) Red skin disease: Each onset cage is sprayed with 4-5 grams of chlorine dioxide, once a day for 3 consecutive days; and ciprofloxacin is taken orally, and ciprofloxacin is added per kilogram of feed. 1-1.5 grams, continuous feeding for 3 days.
(2) Saprovirus: The diseased fish is soaked in 0.4-hour baking soda and salt solution for 20-30 minutes.
(3) Gill disease: Each epidemic cage is splashed with 800-1000 g quick lime, once a day for 3 consecutive days; Furanus is taken orally, 5 g of Furanus is added per kilogram of feed and continuously fed for 3 days. .
(4) Intestinal disease: Furazolidone 0.5 g + 1 kg norfloxacin + 5 g of maternal mothers per kilogram of feed is continuously fed for 3 days, or 3 g of allicin + 1 g of fluoric acid per kilogram of feed is added. , continuous feeding for 3 days.
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