Winter Tilapia Management
2018-04-16 14:00:17
After entering the late autumn, when the pond water temperature gradually dropped to around 16°C, the red tilapia could not adapt. Therefore, before the onset of the first cold wave, broodstock or fingerlings should be captured for winter management.
Pre-winter preparations The wintering pond should be built in a place with good weather, sunny water, good water quality, and convenient water and power supply. The earth pool can also be used cement ponds, the area is generally 40 to 60 square meters, the depth of the pool more than 2 meters, with rectangular suitable. One end of the concrete pool is provided with a water inlet, and the other end is provided with a water outlet. Before the wintering ponds are stocked, they must be cleaned and disinfected. The new pond should be checked for water leakage, and the pond water pH should be adjusted to neutral or slightly alkaline. Overwintering red tilapia broodstock requires sturdy physique, neat specifications and no frostbite. Its individual size is generally about 250 grams, and the survival rate of individual species is 6 to 10 cm. The red tilapia before entering the wintering pool must be trained to pull nets and empty the excrement as much as possible to avoid corrupting the water quality. In addition, the fish body must be disinfected to kill germs and parasites.
Wintering method
1. Hot spring water wintering method. Where there is a hot spring, according to the water temperature and flow size, excavate the corresponding overwintering pool. The spring water with high water temperature needs to flow through a reservoir to be cooled to a certain temperature before being injected into the overwintering pool. The wintering pond should maintain a water depth of about 1 meter, and the amount of water intake and displacement should be similar to keep the water temperature constant.
2. Warming house wintering. The wintering pool is sealed and insulated with glass or plastic film. Overwintering pond area is generally 60 to 100 square meters, water depth of 1.5 meters, the pool should take a "person" shaped shed, cover two layers of film, and the pool side connected into a sealed insulation cover. This method can generally store about 100 kilograms of fish from 40 to 50 grams on a surface of 70 square meters. If the species size is small, the total amount of fish species should be reduced accordingly. In the winter when the outside temperature is very low, a layer of straw curtains is required to cover the film, or other heating measures are taken so that the temperature of the wintering pool is not lower than 16°C. If the temperature rises, some of the film should be opened to allow the air to circulate and avoid dead fish caused by lack of oxygen. In addition to the above-mentioned overwintering methods, there are methods such as using a plant cooling water overwintering method, and using an indoor cement pool to heat overheating.
Winter Management
1. Water temperature control. General control at 18 ~ 20 °C is appropriate. The water temperature is too high, the activity of the fish is increased, the oxygen consumption is large, the water quality is volatile, and it is difficult to manage; the low water temperature affects the normal growth, resulting in thin fish, easy infection, and death. The key to maintaining a stable water temperature is to grasp the temperature changes. Into the harsh winter, especially in the rainy days, we should pay attention to warming, not to reduce the temperature of the water. The temperature in the early spring is rising, and there is a pool of light that can be warmed by sunlight, combined with other auxiliary heating equipment.
2. Water quality. During the winter, due to the density of the fish, the water quality should be kept fresh, tender and cool, and dissolved oxygen should be above 2 mg/l. Therefore, appropriate measures should be taken to control the water quality. One is reasonable feeding; the second is the timely removal of residual food bait; third is the regular replacement of fresh water, it is best for 3 to 4 days for a time, each time changing the water 1/5 to 1/4; four is mechanical oxygen.
3. Feeding. According to the water temperature, water quality, and the fish's feeding and development status, the amount of feeding can be flexibly controlled. The general requirements are multiple, appropriate, and reasonable. Static water tanks generally control the amount of feed every day in the fish body weight of about 0.4%, need to strengthen the cultivation in the late winter, adequate amount of more investment, each feeding amount of 1% of the fish body weight. The temperature of the pool, the daily amount of feed should be controlled in the fish body weight of 1.3% to 3%. In order to prevent premature breeding of broodstock by the end of March, the amount of water per day is 0.5% of the weight of fish.
Pre-winter preparations The wintering pond should be built in a place with good weather, sunny water, good water quality, and convenient water and power supply. The earth pool can also be used cement ponds, the area is generally 40 to 60 square meters, the depth of the pool more than 2 meters, with rectangular suitable. One end of the concrete pool is provided with a water inlet, and the other end is provided with a water outlet. Before the wintering ponds are stocked, they must be cleaned and disinfected. The new pond should be checked for water leakage, and the pond water pH should be adjusted to neutral or slightly alkaline. Overwintering red tilapia broodstock requires sturdy physique, neat specifications and no frostbite. Its individual size is generally about 250 grams, and the survival rate of individual species is 6 to 10 cm. The red tilapia before entering the wintering pool must be trained to pull nets and empty the excrement as much as possible to avoid corrupting the water quality. In addition, the fish body must be disinfected to kill germs and parasites.
Wintering method
1. Hot spring water wintering method. Where there is a hot spring, according to the water temperature and flow size, excavate the corresponding overwintering pool. The spring water with high water temperature needs to flow through a reservoir to be cooled to a certain temperature before being injected into the overwintering pool. The wintering pond should maintain a water depth of about 1 meter, and the amount of water intake and displacement should be similar to keep the water temperature constant.
2. Warming house wintering. The wintering pool is sealed and insulated with glass or plastic film. Overwintering pond area is generally 60 to 100 square meters, water depth of 1.5 meters, the pool should take a "person" shaped shed, cover two layers of film, and the pool side connected into a sealed insulation cover. This method can generally store about 100 kilograms of fish from 40 to 50 grams on a surface of 70 square meters. If the species size is small, the total amount of fish species should be reduced accordingly. In the winter when the outside temperature is very low, a layer of straw curtains is required to cover the film, or other heating measures are taken so that the temperature of the wintering pool is not lower than 16°C. If the temperature rises, some of the film should be opened to allow the air to circulate and avoid dead fish caused by lack of oxygen. In addition to the above-mentioned overwintering methods, there are methods such as using a plant cooling water overwintering method, and using an indoor cement pool to heat overheating.
Winter Management
1. Water temperature control. General control at 18 ~ 20 °C is appropriate. The water temperature is too high, the activity of the fish is increased, the oxygen consumption is large, the water quality is volatile, and it is difficult to manage; the low water temperature affects the normal growth, resulting in thin fish, easy infection, and death. The key to maintaining a stable water temperature is to grasp the temperature changes. Into the harsh winter, especially in the rainy days, we should pay attention to warming, not to reduce the temperature of the water. The temperature in the early spring is rising, and there is a pool of light that can be warmed by sunlight, combined with other auxiliary heating equipment.
2. Water quality. During the winter, due to the density of the fish, the water quality should be kept fresh, tender and cool, and dissolved oxygen should be above 2 mg/l. Therefore, appropriate measures should be taken to control the water quality. One is reasonable feeding; the second is the timely removal of residual food bait; third is the regular replacement of fresh water, it is best for 3 to 4 days for a time, each time changing the water 1/5 to 1/4; four is mechanical oxygen.
3. Feeding. According to the water temperature, water quality, and the fish's feeding and development status, the amount of feeding can be flexibly controlled. The general requirements are multiple, appropriate, and reasonable. Static water tanks generally control the amount of feed every day in the fish body weight of about 0.4%, need to strengthen the cultivation in the late winter, adequate amount of more investment, each feeding amount of 1% of the fish body weight. The temperature of the pool, the daily amount of feed should be controlled in the fish body weight of 1.3% to 3%. In order to prevent premature breeding of broodstock by the end of March, the amount of water per day is 0.5% of the weight of fish.