Reservoir cage culture channel catfish tail should be a good seven off
2018-04-19 15:00:44
Spotted fork tail, also known as cockroaches, river clams, American cockroaches. Because this fish has the advantages of strong adaptability, fast growth, easy feeding, easy catching, and delicious meat, it has become a world-famous breeding species and object of game fishing. It is suitable for farming in most parts of China and is an excellent farmed fish. The use of reservoir aquaculture can increase the production efficiency of reservoir water bodies and achieve high-density and intensive cultivation. However, the following seven levels should be grasped in the breeding practice.
1 Site selection: The fresh water fish is suitable for temperature and water. The optimum temperature range is 0-38°C, and the optimum growth temperature is 21-26°C. When the water temperature is lower than 10°C, feeding and growth are basically stopped. It grows well in pure fresh water and can still live in water with a salinity of 1.4%. Therefore, reservoirs suitable for cage culture must have a water temperature of 0 to 38°C all year round. The water quality meets the fishery water standards. The water source is stable and there is no source of pollution. The wind surface of the reservoir is 0 to 6 years of age, and the ice is not sealed in winter. The area has good vegetation, moderate annual rainfall, convenient transportation, open water, sheltered from the sun, plenty of sunshine, and a quiet environment.
2 Stocking in cages and catfish farms? The guarantee of high yield is to stock quality large-scale fish species. Usually two-level stocking is used. The first level is raised from 10cm to 150g, and the second level is raised from 150g. 750 to 1500 grams can also be grown directly from 50 grams of fingerlings. The stocking density of 8～10cm species is 350-400/m2, and the breeding density of 150g species is 150-250/m2. In recent years, the supply of large-size fingerlings of the fish is limited. Generally only 2 to 3 cm of fry are purchased from outside and they can be kept in cages for two months to develop large-sized fingerlings. At the same time, introduction must ensure pure germplasm, robust physique, and no disease or injury. Also note that polyculture can not be used with grass carp, carp, carp, etc., so as not to affect the growth and yield, but can be used with carp, carp to regulate water quality.
3 Feeding the Channeled Forktail Fish Originally classified as a carnivorous fish, it has been transformed into an omnivorous fish dominated by plant-based feed after many years of cultivation and domestication. Its main feeding targets are benthic organisms, aquatic insects, and zooplankton. Organic debris and large algae. In the cage culture, full-price compound feed can be fed, and granular feed prepared from raw materials such as bran, bran, fish meal, bean cake and corn can also be fed. However, it is required that the protein content must reach 34% to 36%. Before the fish body grows to 6cm, the powdered feed should be applied. After 6cm, the pelleted grain of 2～4mm can be used. Generally, the water temperature can be 5～36°C. Feeding. First domestication should be performed when feeding. Though it is a ground fish, it can be uprooted and eaten by domestication. After entering the box, general fish species must be domesticated for 1 week. The domestication method is to first hit the feed barrel or pot to form a conditional reflex. Daily domestication twice, at 7 to 8 and 16 to 17 hours, according to the "slow - fast - slow" rhythm and "less - more - less" principle to master feeding speed and feeding amount. Feeding amount should be based on the water temperature, fish size and actual food intake. Each feed should be no longer clustered to catch food. Generally, in the fry cultivation stage, the daily feed accounts for 8% of the total fish body weight. When the adult fish stage is at the water temperature of 15 to 21°C, the feed amount is 3% of the total fish body weight, and when the temperature is 15°C or less, it is 1%. Each morning feeds 40%, and 60% in the afternoon. In addition, channel catfish like to feed in the dark light, there is the habit of nocturnal, so in the summer near the cage can be hung with black light traps for food, the use of the advantages of the reservoir area more insect resources fish.
4 The water quality is related to the low oxygen tolerance. Therefore, to maintain the fresh water quality, the dissolved oxygen should always be kept above 3 mg/L. General reservoirs have moderate runoff. Because of the need of electricity, there are microfluidic tanks for power generation. They are extremely suitable for the exchange and self-purification of water bodies inside and outside the tank. Under conditions of winds of 2 to 6, the velocity of the water in the tank is suitable for the stress flow rate of fish. Within the range, water quality conditions are good. For reservoirs with poor water exchange capacity, the method of regularly moving the cage position can be used to adjust the cage to a location where the water quality is better.
5 Management of cage cultures. The daily management is very important. Mainly do the following tasks.
(1) Regular inspections. The fish should be standardized in fish farming, regularly check the growth of fish, observe carefully, analyze the fish condition, find out problems and deal with it in time, do a good job of cage culture log, record the daily water temperature, feeding, feeding, dead fish and disease related conditions, in order to facilitate Gain experience.
(2) brush box. Scrub the cage dirt and algae often to fully exchange water.
(3) Check box. Frequently inspect the cages and repair them in time to avoid running fish or ferocious fish.
(4) adjust the box. As the reservoir water level rises and falls, the cage must be adjusted to a suitable depth.
The 6 rounds of catching catfish are tame and have a good habit. They have colony habits and are easy to catch. With the continuous growth of fish, in order to regulate the breeding density and improve the efficiency, they can be listed in batches and caught in rounds.
7 Disease Prevention and Control Channel catfish? There are many diseases, especially viral diseases. Therefore, prevention must be the main method. In addition to routine disinfection, persist in not feeding degenerative feed, and regularly perform drug prevention. Intestinal septicemia is a common disease. All kinds of fish are susceptible to infection. It can be treated with 0.18 kg oxytetracycline per 100 kg feed. In addition, the small melon worm disease is caused by the skin and pupa tissues of the small melon parasitized fish body, and the prevention and treatment use 8g/l. Copper sulfate dipped in fish for 15 to 20 minutes. The fish is relatively sensitive to bleaching powder and generally does not use it for disinfection and disease prevention.
1 Site selection: The fresh water fish is suitable for temperature and water. The optimum temperature range is 0-38°C, and the optimum growth temperature is 21-26°C. When the water temperature is lower than 10°C, feeding and growth are basically stopped. It grows well in pure fresh water and can still live in water with a salinity of 1.4%. Therefore, reservoirs suitable for cage culture must have a water temperature of 0 to 38°C all year round. The water quality meets the fishery water standards. The water source is stable and there is no source of pollution. The wind surface of the reservoir is 0 to 6 years of age, and the ice is not sealed in winter. The area has good vegetation, moderate annual rainfall, convenient transportation, open water, sheltered from the sun, plenty of sunshine, and a quiet environment.
2 Stocking in cages and catfish farms? The guarantee of high yield is to stock quality large-scale fish species. Usually two-level stocking is used. The first level is raised from 10cm to 150g, and the second level is raised from 150g. 750 to 1500 grams can also be grown directly from 50 grams of fingerlings. The stocking density of 8～10cm species is 350-400/m2, and the breeding density of 150g species is 150-250/m2. In recent years, the supply of large-size fingerlings of the fish is limited. Generally only 2 to 3 cm of fry are purchased from outside and they can be kept in cages for two months to develop large-sized fingerlings. At the same time, introduction must ensure pure germplasm, robust physique, and no disease or injury. Also note that polyculture can not be used with grass carp, carp, carp, etc., so as not to affect the growth and yield, but can be used with carp, carp to regulate water quality.
3 Feeding the Channeled Forktail Fish Originally classified as a carnivorous fish, it has been transformed into an omnivorous fish dominated by plant-based feed after many years of cultivation and domestication. Its main feeding targets are benthic organisms, aquatic insects, and zooplankton. Organic debris and large algae. In the cage culture, full-price compound feed can be fed, and granular feed prepared from raw materials such as bran, bran, fish meal, bean cake and corn can also be fed. However, it is required that the protein content must reach 34% to 36%. Before the fish body grows to 6cm, the powdered feed should be applied. After 6cm, the pelleted grain of 2～4mm can be used. Generally, the water temperature can be 5～36°C. Feeding. First domestication should be performed when feeding. Though it is a ground fish, it can be uprooted and eaten by domestication. After entering the box, general fish species must be domesticated for 1 week. The domestication method is to first hit the feed barrel or pot to form a conditional reflex. Daily domestication twice, at 7 to 8 and 16 to 17 hours, according to the "slow - fast - slow" rhythm and "less - more - less" principle to master feeding speed and feeding amount. Feeding amount should be based on the water temperature, fish size and actual food intake. Each feed should be no longer clustered to catch food. Generally, in the fry cultivation stage, the daily feed accounts for 8% of the total fish body weight. When the adult fish stage is at the water temperature of 15 to 21°C, the feed amount is 3% of the total fish body weight, and when the temperature is 15°C or less, it is 1%. Each morning feeds 40%, and 60% in the afternoon. In addition, channel catfish like to feed in the dark light, there is the habit of nocturnal, so in the summer near the cage can be hung with black light traps for food, the use of the advantages of the reservoir area more insect resources fish.
4 The water quality is related to the low oxygen tolerance. Therefore, to maintain the fresh water quality, the dissolved oxygen should always be kept above 3 mg/L. General reservoirs have moderate runoff. Because of the need of electricity, there are microfluidic tanks for power generation. They are extremely suitable for the exchange and self-purification of water bodies inside and outside the tank. Under conditions of winds of 2 to 6, the velocity of the water in the tank is suitable for the stress flow rate of fish. Within the range, water quality conditions are good. For reservoirs with poor water exchange capacity, the method of regularly moving the cage position can be used to adjust the cage to a location where the water quality is better.
5 Management of cage cultures. The daily management is very important. Mainly do the following tasks.
(1) Regular inspections. The fish should be standardized in fish farming, regularly check the growth of fish, observe carefully, analyze the fish condition, find out problems and deal with it in time, do a good job of cage culture log, record the daily water temperature, feeding, feeding, dead fish and disease related conditions, in order to facilitate Gain experience.
(2) brush box. Scrub the cage dirt and algae often to fully exchange water.
(3) Check box. Frequently inspect the cages and repair them in time to avoid running fish or ferocious fish.
(4) adjust the box. As the reservoir water level rises and falls, the cage must be adjusted to a suitable depth.
The 6 rounds of catching catfish are tame and have a good habit. They have colony habits and are easy to catch. With the continuous growth of fish, in order to regulate the breeding density and improve the efficiency, they can be listed in batches and caught in rounds.
7 Disease Prevention and Control Channel catfish? There are many diseases, especially viral diseases. Therefore, prevention must be the main method. In addition to routine disinfection, persist in not feeding degenerative feed, and regularly perform drug prevention. Intestinal septicemia is a common disease. All kinds of fish are susceptible to infection. It can be treated with 0.18 kg oxytetracycline per 100 kg feed. In addition, the small melon worm disease is caused by the skin and pupa tissues of the small melon parasitized fish body, and the prevention and treatment use 8g/l. Copper sulfate dipped in fish for 15 to 20 minutes. The fish is relatively sensitive to bleaching powder and generally does not use it for disinfection and disease prevention.