What about the lack of oxygen in fish ponds when the temperature is too high or too low?

Fish farming is also a matter of learning, fish survival, can not be separated from oxygen. In general, the dissolved oxygen in aquaculture water should be maintained at 5 - 8 mg/L, at least 3 mg/L. Then in summer, the temperature is too high, or is winter and spring season, the temperature is too low fish pond oxygen how to do?

1. In case of too high temperature, it shall be handled in this way.

1. Regularly add new water

Regularly injecting fresh water into fish ponds is one of the most common and economical ways to regulate water quality. Generally, new water is added once every 7~10 days, and 15~20 cm of new water is added each time. When the deterioration of pool water is serious, water replacement measures should be adopted to maintain good water quality conditions. The pond mainly for breeding grass gold and red carp is light green than silver carp. New water should be poured every 7~10 days, and the water level should be increased by 20-25 cm each time. The highest water level should be maintained as far as possible when the temperature is high in summer.

2. Use aerator to increase oxygen

Each pond should be equipped with a special aerator, of which impeller type is the best. Startup oxygenation can make water convection, increase dissolved oxygen in water and emit toxic gases. Note that it opens at noon on sunny days, in cloudy days in the morning, and in rainy weather in the middle of the night. The startup time is 1~4 hours each time. In addition, when there are signs of floating head, turn on oxygen in advance.

3. Regularly stir sediment

Agitation of sediment can promote continuous decomposition of sediment and indirectly control water quality changes. Generally stir once every 10~15 days, each time stirring area is not less than 1/3 of the water area, and the best stirring effect is at noon on sunny days, but do not stir in sultry and low air pressure weather.

4. Use of drug modification

Some pond fish density is large, and there is no condition to change water frequently, at this time should be regularly applied quicklime to adjust water quality, reduce hydrogen sulfide and other toxic gases poison. 15 kg quicklime can be used per mu of pond every time. After adding water, the whole pond can be splashed every 20 days or so. Photosynthetic bacteria have the advantages of purifying water quality and increasing dissolved oxygen in water. They can also be used as bait for filter-feeding fish. Generally, they are spilled once every 20 days. There are too many zooplankton in fish ponds, which can be killed by trichlorfon, 0.3~0.5 mg per cubic meter of water. Cyanobacteria can be inhibited by copper sulfate when excessive, 0.7 mg per cubic meter of water. When fish float, oxygenator and other related drugs can also be selected to increase oxygen.

5, appropriate dressing fertilizer

Appropriate topdressing of chemical fertilizers can keep phytoplankton at an appropriate density and vigorous living state for fish consumption. At the same time, phytoplankton can absorb nutrients from water and produce oxygen through photosynthesis, thus improving water quality. Therefore, fertilization in high temperature season should be based on chemical fertilizer, less organic fertilizer, generally in the pond with thin water quality, urea 2.5 kg per mu, calcium superphosphate 5 kg, every 5~7 days. If you want to apply organic fertilizer. It must be fully fermented and applied in small amounts and many times.

6. Aquatic animals

Aquatic animals are consumers in water bodies. Proper breeding can promote the balance of water ecosystem and regulate water quality. For example, interbreeding red carp and gold crucian carp can make full use of residual organic matter in water body, greatly reduce the decomposition of organic matter at the bottom of water body and reduce the probability of pollution; interbreeding grass gold can ensure sufficient dissolved oxygen in water body and purify breeding environment.

7. Transplanting aquatic plants

Aquatic plants, as the primary "productivity" of water, can control the growth of algae in fish ponds and play a good role in purifying water. According to the actual conditions of the pond, the breeders can reasonably introduce and transplant aquatic plants such as Hydrilla verticillata, Houttuynia cordata, Eichhornia crassipes and duckweed into the water body according to local conditions, so as to adjust the water quality and improve the dissolved oxygen level.

II. This is how to deal with the case of low temperature

1. Aerated equipment

Aerated equipment is the necessary equipment for facility aquaculture. There are many kinds, mainly microporous aeration aerator, impeller aerator, waterwheel aerator, inflatable aerator, jet aerator, spray aerator and so on. The main purpose of aeration equipment is to increase dissolved oxygen in water, and to achieve aeration and improve water quality by stirring water and promoting water circulation.

2. Drainage and irrigation equipment

Aquaculture facilities in the irrigation equipment is mainly pumps, centrifugal pumps, submersible pumps, axial flow pumps, mixed flow pumps, deep well pumps and so on. The purpose of the pump is to transport fluid, in aquaculture is mainly to the pond water injection and drainage, to ensure that the fish at different growth stages of different water level requirements; injection of river water or deep well water to adjust the temperature; injection of new water, increase the dissolved oxygen in the water, improve the transparency of the pool water, strengthen the photosynthesis of the pool water, improve the primary productivity of the pond; pumping out excess and aging water in the pond, adjust the water quality, salinity and pH value, and give the fish a suitable living environment.

3. Feeding equipment

Feeding machines named by feeding form include centrifugal feeding machine, air feeding machine and falling feeding machine; feeding machines named by feeding mode include vibrating feeding machine, turning plate feeding machine and screw feeding machine. Feeding machine can be fixed time, fixed times, quantitative, fixed point, uniform automatic feeding, with labor saving, time saving, reduce feed waste, protect the water environment and other characteristics.

4. Water purification equipment

In facility aquaculture, biological filter, active filter and water purification machinery are mainly used for water purification, such as biological rotary table, activated carbon water filtration device, tillage machine and ozone disinfection aerator. Water purification equipment can purify and treat harmful substances such as organic matter and ammonia nitrogen in water.

5. Clear pond equipment

In the pond that needs drying, in order to improve the working efficiency of clearing the pond, engineering machinery is mainly used, such as bulldozers, excavators, Iraqi transport machines, etc. Dredging machinery is mainly used in wet ponds with water. The commonly used dredging machinery includes amphibious dredging machine, traction cleaning computer, hydraulic high-pressure cleaning machine, pond digging unit and underwater cleaning machine, etc. Their main function is to divide, collect, extract and transport the sludge of fish ponds to specific places.

6, water quality testing instruments

Water quality testing instruments mainly include dissolved oxygen meter, pH meter, water temperature meter, ammonia meter, etc., which are used to detect whether the water quality of the pond meets the fishery water quality standards.

7. Water temperature control equipment

Water temperature control equipment includes boiler system, electric heater, solar heater, heat pump, heat exchanger, water temperature automatic control system, etc. Its main function is to regulate the water temperature of fish ponds and promote the rapid growth of fish in the optimal water temperature.