First, living habits Ya fish (Qi mouth crack abdomen fish, etc.) Hi habitat in the water is fresh, there is water, water is sufficient, with gravel geological cold water streams. The optimum growth water temperature is 18--22°C. Below 8°C or above 24°C, appetite diminishes and growth slows. Water temperature exceeds 26°C and stops feeding. Prolonged high temperature, the body weakened and died. Ya fish is a hi oxygen fish. The water quality requirement of the cultured Ya fish is high in transparency and high in dissolved oxygen. When the dissolved oxygen in the water is lower than 4 mg/L, the respiratory frequency of the Ya fish is accelerated, and the discomfort is felt. When the dissolved oxygen in the water is less than 2.8 mg/L, the fish floats. And there was death; when the dissolved oxygen in the water was less than 2mg/L, a large number of deaths occurred. This value is the lethal point of the summer Ya fish. The amount of dissolved oxygen in the water is 5mg/L. The growth of the Ya fish is normal. The dissolved oxygen in the water is 7mg/L. The Ya fish has the fastest growth. Ya fish can survive in the pH value of 5.5--8.2 water environment, the optimum PH value is 7--7.5.
Second, the cultivation of Ya fish seedlings (a) Training of fish fry The newly hatched larvae body color is very light, when the larvae are afraid to see the light, hi set in the water flow is weak, the bottom of the light dark pool; water flow is easy to cause Suffocate death. For this reason, the bottom of the pool should be kept clean and the flow of water should be appropriately increased. The water injection per 10,000 fry is kept at about 1 litre/minute. The larvae pond area is generally 5 to 10 meters, and the stocking density is about 500. According to the characteristics of the various stages of development of the fish seedlings, it is necessary to give nutritious and easy to digest feed. At the beginning of feeding, due to the fact that the fry did not have the habit of ingesting artificial feed, the feed should be sprinkled in every corner and only some feeds should be used. The cooked egg yolk can be initially slurried to the top of the fish pond and the surface of the fish, allowing the fish to run into the yolk granules. Fish fry can concentrate and compete for food, and it is possible to drip the feed to the place where the fry is concentrated. It is also possible to use a gauze to extrude the cooked egg yolk in finely divided droplets in the water. Later, the egg white can also be used together. In order to ensure complete nutrition, they can also be fed with rotifers and chopped water mounds, or they can be put on thin wire and hung in the pool so that the fry can feed themselves slowly. After that, raw eggs and wheat flour are added to the paste feed. After cooking, they are rubbed into small particles on the wire mesh and fed 6-7 times a day. The fry grows quickly under the conditions of good feeding, with black flower spots.
(2) Fish Breeding 1. Feed: The nutritional requirements of compound feeds for Ya Fish are similar to those of carp. The daily feed rate of Ya fish is 2-8% of the fish's body weight. 2. Screening of seedlings: Unbalanced growth of Ya fish is a common phenomenon. When the fish fry grows to 2 g body weight, it needs to be screened once, and is fed in different pools according to different specifications to improve the survival rate and accelerate the growth of fry and fingerlings. 3. Frequent decontamination: In the water with high water quality and high oxygen content, ya fish likes to increase the amount of waste discharged from feeds and fish as the culture time increases. Although water can wash away part of the water, There is a part of the bottom layer of hydrostatic water. These leftovers and excreta not only pollute the water quality, consume oxygen, but also spread fish diseases, which are extremely unfavorable to the fry species cultivation and must be eliminated in time.
(III) Pond aquaculture (1) Conditions and requirements for aquaculture ponds. The ponds are solid, do not leak water, have sufficient water sources, and are convenient for water injection and drainage. The water depth is suitable for 1.0-1.5M, the water quality is clear, and the dissolved oxygen is not lower than 6.5mg/L. The water temperature is not higher than 23 degrees.
(2) Prepare for stocking, disinfect the pond, and infuse new water.
(3) Fish stocking specifications and density, general specifications for tail weight 10g. Stocking density is 5000/mu.
(4) Cultivation period management, regular inspections of fish ponds to strictly control water quality, and finding problems in time to take measures; feed mainly water wedges and compound feed two types, control the daily feeding amount, generally 2-5 of the fish's body weight? Feeding. Normally feed 3-5 times a day; do fixed, regular, quantitative feeding; pay attention to pool water, water level to maintain about 1.5M, daily water exchange volume is 20? Attention to fish pond health and disease prevention, timely cleaning pool Weeds, large-scale algae and feed residues in the ponds and ponds are regularly fed with medicines to prevent diseases, and the cause of the disease is found out in a timely manner, and the corresponding measures are taken; periodic inspections are performed to make records.
(D), cage culture (1) stocking specifications and density. Ya fish net cage culture can be divided into two types, one is the middle of the seedling cage cultivation stage; the second is the development phase. The stocking specifications for the mid-cultivation stage of the seedlings are preferably 3 cm body length and a stocking density of 1000 fish/m3. In the growing stage, the fish species with a body length of 10 cm are stocked at a density of 50 fish/m3.
(2) Daily management of cages. Safety inspection, prevent fish escape, check the safety of the cage regularly in the process of cage culture; ensure no fish escape, keep a good record of feeding, including fish activity and feeding conditions, water temperature measurement, death, weather changes , fish growth (measured once every 10-15 days), cage damage and repair.
Second, the cultivation of Ya fish seedlings (a) Training of fish fry The newly hatched larvae body color is very light, when the larvae are afraid to see the light, hi set in the water flow is weak, the bottom of the light dark pool; water flow is easy to cause Suffocate death. For this reason, the bottom of the pool should be kept clean and the flow of water should be appropriately increased. The water injection per 10,000 fry is kept at about 1 litre/minute. The larvae pond area is generally 5 to 10 meters, and the stocking density is about 500. According to the characteristics of the various stages of development of the fish seedlings, it is necessary to give nutritious and easy to digest feed. At the beginning of feeding, due to the fact that the fry did not have the habit of ingesting artificial feed, the feed should be sprinkled in every corner and only some feeds should be used. The cooked egg yolk can be initially slurried to the top of the fish pond and the surface of the fish, allowing the fish to run into the yolk granules. Fish fry can concentrate and compete for food, and it is possible to drip the feed to the place where the fry is concentrated. It is also possible to use a gauze to extrude the cooked egg yolk in finely divided droplets in the water. Later, the egg white can also be used together. In order to ensure complete nutrition, they can also be fed with rotifers and chopped water mounds, or they can be put on thin wire and hung in the pool so that the fry can feed themselves slowly. After that, raw eggs and wheat flour are added to the paste feed. After cooking, they are rubbed into small particles on the wire mesh and fed 6-7 times a day. The fry grows quickly under the conditions of good feeding, with black flower spots.
(2) Fish Breeding 1. Feed: The nutritional requirements of compound feeds for Ya Fish are similar to those of carp. The daily feed rate of Ya fish is 2-8% of the fish's body weight. 2. Screening of seedlings: Unbalanced growth of Ya fish is a common phenomenon. When the fish fry grows to 2 g body weight, it needs to be screened once, and is fed in different pools according to different specifications to improve the survival rate and accelerate the growth of fry and fingerlings. 3. Frequent decontamination: In the water with high water quality and high oxygen content, ya fish likes to increase the amount of waste discharged from feeds and fish as the culture time increases. Although water can wash away part of the water, There is a part of the bottom layer of hydrostatic water. These leftovers and excreta not only pollute the water quality, consume oxygen, but also spread fish diseases, which are extremely unfavorable to the fry species cultivation and must be eliminated in time.
(III) Pond aquaculture (1) Conditions and requirements for aquaculture ponds. The ponds are solid, do not leak water, have sufficient water sources, and are convenient for water injection and drainage. The water depth is suitable for 1.0-1.5M, the water quality is clear, and the dissolved oxygen is not lower than 6.5mg/L. The water temperature is not higher than 23 degrees.
(2) Prepare for stocking, disinfect the pond, and infuse new water.
(3) Fish stocking specifications and density, general specifications for tail weight 10g. Stocking density is 5000/mu.
(4) Cultivation period management, regular inspections of fish ponds to strictly control water quality, and finding problems in time to take measures; feed mainly water wedges and compound feed two types, control the daily feeding amount, generally 2-5 of the fish's body weight? Feeding. Normally feed 3-5 times a day; do fixed, regular, quantitative feeding; pay attention to pool water, water level to maintain about 1.5M, daily water exchange volume is 20? Attention to fish pond health and disease prevention, timely cleaning pool Weeds, large-scale algae and feed residues in the ponds and ponds are regularly fed with medicines to prevent diseases, and the cause of the disease is found out in a timely manner, and the corresponding measures are taken; periodic inspections are performed to make records.
(D), cage culture (1) stocking specifications and density. Ya fish net cage culture can be divided into two types, one is the middle of the seedling cage cultivation stage; the second is the development phase. The stocking specifications for the mid-cultivation stage of the seedlings are preferably 3 cm body length and a stocking density of 1000 fish/m3. In the growing stage, the fish species with a body length of 10 cm are stocked at a density of 50 fish/m3.
(2) Daily management of cages. Safety inspection, prevent fish escape, check the safety of the cage regularly in the process of cage culture; ensure no fish escape, keep a good record of feeding, including fish activity and feeding conditions, water temperature measurement, death, weather changes , fish growth (measured once every 10-15 days), cage damage and repair.
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