In aquaculture, the content of dissolved oxygen is directly related to the growth and reproduction of aquatic organisms.
Reasonable and effective aeration is an indispensable daily management means in the breeding process, and it is also the key to the success of breeding!
This article will give you a detailed introduction to several main oxygen enhancement methods and their corresponding equipment.
1. Oxygen increase method
Biological oxygenation
Biological oxygenation is to promote the decomposition of organic matter and the production of oxygen by increasing the number of aerobic microorganisms in the water body. The commonly used biological oxygenation methods include cultivation of algae (bitter grass, Elaeophyllum, caryophylla, etc.) and delivery of biological carriers.
Algae produce oxygen through photosynthesis, raising the dissolved oxygen content in the water. The biological carrier can provide an environment for microbial adhesion and growth, increase the number of aerobic microorganisms, and promote the decomposition of organic matter and the production of oxygen. When using biological carriers, it is necessary to clean and maintain them regularly to avoid the breeding of harmful microorganisms.
Biological oxygenation has the advantages of low cost and long lasting effect. But its effect is affected by environmental factors such as light and temperature. In the case of excessive growth or decay of aquatic plants, the water quality may be adversely affected.
Chemical oxygenation
Chemical oxygenation is to increase the dissolved oxygen content in the water body by adding chemicals to the water body to produce oxygen or promote the dissolution of oxygen. Commonly used chemical oxygenators are sodium peroxycarbonate, peroxyamide, calcium peroxide, hydrogen peroxide and ammonium peroxydisulfide and so on. Different chemical agents have different oxygenation effects and application ranges, so it is necessary to choose the appropriate chemical agents according to the specific conditions of the aquaculture water body.
Chemical oxygenator and water reaction can quickly generate oxygen, easy to use and low cost, but attention should be paid to control the amount, to avoid excessive use of aquatic organisms caused harm.
Mechanical aeration
The dissolved oxygen in the water body is mainly increased by providing water bodies with high oxygen content to the pond through aquatic machinery or by supplementing oxygen to the water body through effective contact with the air. The main mechanical oxygenation methods are impeller type aerator, water wheel type aerator, jet type aerator, and micro-hole aerator.
Second, oxygen equipment
There are many kinds of oxygenation equipment for aquaculture on the market, and the following are several common oxygenation equipment:
Impeller oxygenation: The motor drives the impeller to rotate, stirring the water body to form a splash, increasing the contact area between the water body and the air, thereby increasing the dissolved oxygen content. It is suitable for pond culture with shallow water depth and large area. It mainly increases the oxygen on the surface of the water body, and the oxygen increase effect on the bottom of the water body is limited.
Water wheel type aerator: the motor drives the water wheel blade to rotate, stirring the water on the surface of the water body to increase contact with the air, and then achieve good oxygenation and promote the effect of water flow. Suitable for deep silt, large water aquaculture. The noise is large, it is easy to form water fog, and the effective water depth of oxygenation is not more than 1 meter.
Microporous aeration aeration: The fan is driven by the motor to produce gas, and the gas is released into the water body in the form of tiny bubbles through the microporous aeration disc to increase the dissolved oxygen content in the water body. It can effectively improve the dissolved oxygen of the whole water body, especially the lower water body. Uniform dissolved oxygen, low noise, low energy consumption.
Roots fan: Generates a large amount of gas through mechanical properties and transmits the gas through pipes to the aquaculture water body to form micro-bubbles and increase the dissolved oxygen content in the water body. Large exhaust volume, high exhaust pressure, long service life. Suitable for factory farming and deep water farming.
In addition to the above common mechanical oxygenation methods, there are some other ways, such as centrifugal aerators, jet aerators and so on. These devices have their own characteristics and are suitable for different farming environments and needs.