aeration & oxygenation

 

Air-breathing animals are used to air that contains about 21 percent oxygen. In aquaculture, fish are raised in an environment that contains less than 0.0001 percent oxygen (10 mg / l). Because there is therefore very little oxygen even under optimal conditions, knowledge of dissolved oxygen, oxygen measuring devices and oxygen transfer technology are decisive success factors for fish producers in controlling water quality. If the oxygen level is too high, oxygen supersaturation can cause gas embolism, suppress metabolism, and inhibit respiratory enzymes, which can kill all fish. If it is too low, the fish may not eat and may require additional energy to find oxygen. This problem (for RAS and flow systems) becomes more critical the higher the fish density and the lower the water flow rate. In intensive fish culture, dissolved oxygen is usually the first limiting factor.

 

When water comes into contact with air, each of the gases in the air (N2, O2, etc.) move in or out of the solution to achieve a balance between the liquid and gas phases. At the point of equilibrium, the water is called "air saturated". When the concentration of one of the dissolved gases changes (i.e. consumption of O2, production of CO2), the gas diffuses into or out of the water until equilibrium is restored. The rate at which a particular gas dissolves in water depends on several factors (surface, pressure, salinity, and concentration). If the oxygen consumption rate is higher than the replenishment rate due to aerators or the available oxygen in the water supply, supplementation with pure oxygen is required.

 

In the context of intensive aquaculture operations, oxygen is the most important limiting factor in terms of optimizing growth, feed conversion rate, and health. The sensitive balance between dissolved oxygen and oxygen consumption can change quickly with variable algae, temperature, and wind conditions. In outdoor ponds, there can, therefore, be a lack of oxygen in the summer when the temperature rises. Oxygen should therefore always be monitored continuously. Monitoring and data analysis provide you with important insights to optimize your breeding conditions. In order to develop optimal oxygen supply concepts, various location-dependent, technological, and biological factors must be taken into account. We supply a wide range of products to guarantee cost-effective, efficient oxygen transfer in a wide variety of conditions. This includes, on the one hand, highly efficient oxygen vents, which are matched to certain areas of application, and on the other hand, solenoid valves, flow meters and sensors to precisely adapt the oxygen supply to the needs of the fish.

   

powerless open solenoid valve

optical oxygen sensor

flowmeter oxygen

automatic feeder

(adjustable feeding in 

relation to O2- levels)

oxygen bottle with

pressure reducer

ceramic high pressure oxygen diffuser

Blue Evolution Aquatechnology

Heinrich-Stützel-Strasse 11

76829 Landau

info@blue-evo.com

+491608257682

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© 2020 Matthias Hundt