Fish need 3 times more oxygen than usual to complete their digestion.
Feeding should be based on the percentage of body weight of the fish to prevent food from remaining in the pool.
Feeding should be arranged in a timely manner so that the fish will not be deprived of oxygen during digestion, so it is important to avoid feeding in the morning and at sunset.
It is essential to provide dissolved oxygen when reducing oxygen, especially from sunset to before sunrise.
Reduction of dissolved oxygen in water depends on:
Measurement of dissolved oxygen
Water-soluble oxygen should be monitored twice a day, early in the morning and early in the night. Low oxygen levels early in the night are very worrying.
Larger fishes have higher oxygen consumption as a result of fish coming to the surface being louder. The use of an oxygenator is essential when reducing oxygen, especially from early night to early morning.
What is aeration and what is the benefit?
Aeration is a method by which water-soluble oxygen is equilibrated with air (saturation). This is done by mechanical devices.
Any device that can mix with the air is a type of aeration, but because of the efficiency of the work and the energy consumption and the cost of running it is very important that we use a special aeration system for the aeration.
One is injection of pure air or oxygen into the water (such as air pump, blower, etc.), and the second is to stir water or spout to balance oxygen.
So aeration is also a kind of mixing of water with the production of oxygen and uniformity of its thermal and nutritional layers. Aeration also helps to remove toxic wastes that are soluble in water as a gas.
In general, the selected aeration should have the following benefits:
2- No need for grease
3- Permanently working
5- No sophistication in its technology
6- Oxygen transfer efficiency compared to energy consumption
The components used in the oxygenation system include:
The Benefits of Pure Oxygen in the Aquaculture Industry:
Increase the concentration of dissolved oxygen up to 4 times its saturation of about 40 mg / L, especially in hot waters in summer.
Increase aquatic production per unit volume
Reduce risk and prevent fish deaths in summer as well as in warm waters.
Increase aquatic production by up to fivefold in areas with limited water resources or rotary systems are used for aquaculture.
Better aquatic nutrition and Significant decrease in aquatic growth period
Decrease in aquatic excrement material
Significant reduction in water intake in rotary systems
Reduce common infections
Reduce consumption of tonic material to increase fish weight.
Suitable oxygenation in Race way systems during river water pollution
Prevents the saturation of nitrogen gas in water and prevents gas bubble disease
No effect of geographical fluctuations (height, pressure and temperature) on the capacity of the device and storage system.
Eliminate all costs related to providing, transporting, storing and recharging cylinders and oxygen tanks.
Equipped with a sensitive controller for detecting the compressed air entering the system as well as having an overview of the purity and pressure of the output gas.
The importance of Oxygen supply for aquaculture
1- Reduce feed conversion ratio or increase digestion and absorption of food
2-Increasing water efficiency, thereby more production
3- Prevent water poisoning by substances that enter the water from outside as well as aquatic waste
4- Increase aquatic growth, health and vitality
Providing oxygen to fish is sometimes more important than providing food.
The presence of oxygen in the water causes digestion and absorption of food, so oxygen can improve the feed conversion ratio.
With enough oxygen in the water, we can store more aquatic per unit area and feed more so you can produce more per unit area.
Sufficient oxygen in the water reduces the toxicity of water by aquatic waste or even substances that enter the water from outside.
Oxygen in the water brings more health and vitality to the fish.