Freshwater whitefish are omnivorous fish, juvenile fish (fish) when the main zooplankton-based food, but also ingest organic detritus and a variety of artificial feed. The fry cultivation phase should pay attention to the following matters:
First, special pond cultivation Due to the fresh water, white leeches and miscellaneous foods, the growth rate is fast, the disease is less, and the group lives together. It is particularly sensitive to certain organophosphates (such as trichlorfon, malachite green, etc.) The perspective should be considered for special pool cultivation. In addition, both the freshwater and white pelicans, whether they are fry or adult fishes, prefer to “sinkâ€, and when they catch it, they “drill†the bottom of the net or the bottom of the pool. If there are other fish polycultures, it is often necessary to separate all types of fish fry. Because of its dense scales, it is easy to be injured. In order to reduce unnecessary losses and facilitate the growth and development of fry, the fry stage cultivation is actually more beneficial and less harmful.
The ponds that cultivate freshwater whitefish are generally 1-2 mu in area and 80-100 cm deep. Requirements: The pond is disinfected 5 to 6 days before the fry of the fish (the poisonous pond method is the same as other fry, available lime, tea bran, strong chlorine, etc.), the pool water is stable and does not leak. Since the freshwater white squid has small individuals at the flowering stage, and its tolerance to hypoxia is stronger than that of other fish, the density of the freshwater white squid can be appropriately increased and it can control 20,000 to 300,000 robust fish flowers per acre of water.
Second, the daily management of freshwater white carp seedlings fell to the pool the next day began feeding feed. Because the fish is tender and small, it mainly eats zooplankton in the pond, but it must be fed a certain high-protein and fine-grained slurry feed, such as egg yolk or soy milk. Under normal circumstances, the source of egg yolk (chicken and duck) is convenient and the effect is good. The method is: Calculate the number of eggs per day per 10,000 fish (2-3 eggs after 3-4 days), first cook the eggs, then remove the shell and protein, and the remaining cooked egg yolks, mix the water with a dense filter yarn ( 2-3 kg) Pulverize and spread evenly to the pond in the afternoon. In addition, the cultivation pool should be properly piled with perishable chrysanthemums (grass) or stinky grasses, so that the transparency of the pool water can be maintained at 20-25 cm to achieve good water quality standards.
Freshwater white squid flowers are fed to the 4-5 yam (about 1.2 cm in length) after 6-7 days of egg yolk. The egg yolk can be stopped at this time, and the powdered and high-protein mixed feed can be started. At present, most of the mixed feed consists of soybeans, peanut bran, and wheat hulls, and the proportions are 40%, 30%, and 30% respectively. The daily feed rate was 0.5 kg per 10,000 fry from the beginning to 1.5 kg later. Gradually increase, flexibility. Feeding method: Weigh the mixed feed that has been crushed, and then use water to make a paste. The whole pool is evenly spilled on the afternoon. 3. Prevention of Diseases and Insect Pests Diseases of freshwater and white plague are less frequent than those of domestic fish, but if they become infected, the disease will become fierce and the mortality rate will be high. In order to keep the fry healthy and reduce losses, it is necessary to do preventive work. First of all, fry cultivation stage (especially seedlings 6-7 toward the former) to guard against serious floating head of the fish, such as hot weather early in the morning or before the onset of storms, it is necessary to visit the pond, remove the grass in time in the pond. Once there is an abnormal phenomenon in pond fish, immediately inject new water or take other oxygenation measures. Second, freshwater white puffer fishes are prone to fish diseases caused by parasites (such as small melons, ringworms, worms, etc.). Symptoms are generally more pronounced: at the beginning, the fish colonise, and they are dispelled; then (for more than half a day) the weaker caudal fins are bitten and gradually die. At this time, it was not treated, and the mortality rate of infected fish was more than 80%, and even the entire pool was lost. A group of whitefish found in groups, the following treatment methods can be used: 1, mercuric nitrate per cubic meter of water with 0.1 grams to calculate, said the whole solution after taking the drug dissolved water spray, once a day, two consecutive times; 2, such as Mercurous nitrate is inconvenient. It can be used to boil ginger and pepper for half an hour, and then watered Quanchiposa. The dosage is 1 meter deep per acre with half a catty of ginger, and 1 pound of pepper is broken and then used.
IV. Timely pooling and sales of freshwater white squid flowers After 20-25 days of feeding and culturing, the body's phosphorus sheets have been lengthened and there are already existing colors on the sideline complete body surface. Body length and weight have increased 4-5 times. If it is not timely to pool or sell, the density is too large and the feed is insufficient, and the survival rate will be seriously affected. For the normal growth and development of fry and improve the survival rate, this time should be divided into pools or sales, but should pay attention to the following aspects: 1, pre-prepared to put the fry of the pond (including disinfection, finishing, water). 2. Fish feeds should be stopped before the day of sale or the sale of the fry, and the flesh should be returned immediately after the fry is pulled with a soft dense net. 3. If the ponds put into the pool are not far away from the original pool, they will be transported with water for some time immediately after fishing and slowly put into the pond to be put. If the fry is to be sold or separated from the pond, the original pond fry should be slowly thrown into a pre-prepared pool hopper, suspended for 2-3 hours before being transported. 4. The fry or the fry purchased by the sub-pool should be immersed in the crude salt water of 6 ‰ or per cubic meter of potassium permanganate solution for 5 minutes before falling, and then the fry slowly. Put it in the pool - manage it by marking.
First, special pond cultivation Due to the fresh water, white leeches and miscellaneous foods, the growth rate is fast, the disease is less, and the group lives together. It is particularly sensitive to certain organophosphates (such as trichlorfon, malachite green, etc.) The perspective should be considered for special pool cultivation. In addition, both the freshwater and white pelicans, whether they are fry or adult fishes, prefer to “sinkâ€, and when they catch it, they “drill†the bottom of the net or the bottom of the pool. If there are other fish polycultures, it is often necessary to separate all types of fish fry. Because of its dense scales, it is easy to be injured. In order to reduce unnecessary losses and facilitate the growth and development of fry, the fry stage cultivation is actually more beneficial and less harmful.
The ponds that cultivate freshwater whitefish are generally 1-2 mu in area and 80-100 cm deep. Requirements: The pond is disinfected 5 to 6 days before the fry of the fish (the poisonous pond method is the same as other fry, available lime, tea bran, strong chlorine, etc.), the pool water is stable and does not leak. Since the freshwater white squid has small individuals at the flowering stage, and its tolerance to hypoxia is stronger than that of other fish, the density of the freshwater white squid can be appropriately increased and it can control 20,000 to 300,000 robust fish flowers per acre of water.
Second, the daily management of freshwater white carp seedlings fell to the pool the next day began feeding feed. Because the fish is tender and small, it mainly eats zooplankton in the pond, but it must be fed a certain high-protein and fine-grained slurry feed, such as egg yolk or soy milk. Under normal circumstances, the source of egg yolk (chicken and duck) is convenient and the effect is good. The method is: Calculate the number of eggs per day per 10,000 fish (2-3 eggs after 3-4 days), first cook the eggs, then remove the shell and protein, and the remaining cooked egg yolks, mix the water with a dense filter yarn ( 2-3 kg) Pulverize and spread evenly to the pond in the afternoon. In addition, the cultivation pool should be properly piled with perishable chrysanthemums (grass) or stinky grasses, so that the transparency of the pool water can be maintained at 20-25 cm to achieve good water quality standards.
Freshwater white squid flowers are fed to the 4-5 yam (about 1.2 cm in length) after 6-7 days of egg yolk. The egg yolk can be stopped at this time, and the powdered and high-protein mixed feed can be started. At present, most of the mixed feed consists of soybeans, peanut bran, and wheat hulls, and the proportions are 40%, 30%, and 30% respectively. The daily feed rate was 0.5 kg per 10,000 fry from the beginning to 1.5 kg later. Gradually increase, flexibility. Feeding method: Weigh the mixed feed that has been crushed, and then use water to make a paste. The whole pool is evenly spilled on the afternoon. 3. Prevention of Diseases and Insect Pests Diseases of freshwater and white plague are less frequent than those of domestic fish, but if they become infected, the disease will become fierce and the mortality rate will be high. In order to keep the fry healthy and reduce losses, it is necessary to do preventive work. First of all, fry cultivation stage (especially seedlings 6-7 toward the former) to guard against serious floating head of the fish, such as hot weather early in the morning or before the onset of storms, it is necessary to visit the pond, remove the grass in time in the pond. Once there is an abnormal phenomenon in pond fish, immediately inject new water or take other oxygenation measures. Second, freshwater white puffer fishes are prone to fish diseases caused by parasites (such as small melons, ringworms, worms, etc.). Symptoms are generally more pronounced: at the beginning, the fish colonise, and they are dispelled; then (for more than half a day) the weaker caudal fins are bitten and gradually die. At this time, it was not treated, and the mortality rate of infected fish was more than 80%, and even the entire pool was lost. A group of whitefish found in groups, the following treatment methods can be used: 1, mercuric nitrate per cubic meter of water with 0.1 grams to calculate, said the whole solution after taking the drug dissolved water spray, once a day, two consecutive times; 2, such as Mercurous nitrate is inconvenient. It can be used to boil ginger and pepper for half an hour, and then watered Quanchiposa. The dosage is 1 meter deep per acre with half a catty of ginger, and 1 pound of pepper is broken and then used.
IV. Timely pooling and sales of freshwater white squid flowers After 20-25 days of feeding and culturing, the body's phosphorus sheets have been lengthened and there are already existing colors on the sideline complete body surface. Body length and weight have increased 4-5 times. If it is not timely to pool or sell, the density is too large and the feed is insufficient, and the survival rate will be seriously affected. For the normal growth and development of fry and improve the survival rate, this time should be divided into pools or sales, but should pay attention to the following aspects: 1, pre-prepared to put the fry of the pond (including disinfection, finishing, water). 2. Fish feeds should be stopped before the day of sale or the sale of the fry, and the flesh should be returned immediately after the fry is pulled with a soft dense net. 3. If the ponds put into the pool are not far away from the original pool, they will be transported with water for some time immediately after fishing and slowly put into the pond to be put. If the fry is to be sold or separated from the pond, the original pond fry should be slowly thrown into a pre-prepared pool hopper, suspended for 2-3 hours before being transported. 4. The fry or the fry purchased by the sub-pool should be immersed in the crude salt water of 6 ‰ or per cubic meter of potassium permanganate solution for 5 minutes before falling, and then the fry slowly. Put it in the pool - manage it by marking.