Seawater generally contains less and less oxygen. This is bad for all creatures, fish and plants that live in the sea. Science holds global warming responsible because warmer water can dissolve less oxygen than colder water. In addition, waste water from industry and agriculture that reaches the sea also reduces oxygen. In the Baltic Sea, the Gulf of Mexico or the Chinese Sea, for example, there is drastically less oxygen.
This is one of the reasons why the trend in fish farming is towards indoor aquaculture. There the fish are kept in small groups in tanks. See also picture on the left. It is assumed, for example, that the risk of infection or infection is lower for smaller units. When salmon are infested with lice during fish farming in the sea, it is very difficult to prevent the lice from spreading to neighbouring units.
The water is treated separately for each tank. The feeding is precisely planned and dosed. Each tank is electronically monitored. In this way you can control the water quality and react quickly if necessary, and sort out sick fish. Such a plant does not have to stand at the sea any more, but can stand somewhere in the interior of the country.
The disadvantage of this method, in the hall one usually has no fresh sea water available or fresh water from the fjord. Water lacks its naturalness, its natural minerality and above all oxygen. Oxygen comes in the sea through waves or in rivers and streams flowing over stones into the water. However, if water is recycled, i.e. purified and filtered, oxygen and other minerals must be added.
Merus increases the dissolved oxygen
The dissolved oxygen in the water is enormously important for the growth and also the health of the fish. For example, aquaculture operators try to maximise the oxygen content. The picture on the right shows mechanical procedures with paddles, this method is often used in Southeast Asia, for example in shrimp farms. However, mechanical systems are maintenance-intensive and require a lot of personnel.
This is why oxygen is very often dosed directly into the water in aquacultures. With this dosage better results are achieved than with the mechanical processes.
Merus rings were installed in such a hitech aquaculture in North America to solve corrosion and algae problems in the water system. The operator noticed in his scada system that since the Merus rings are installed the oxygen concentration in the water is significantly higher than before. This is due to Merus‘ ability to significantly increase the solubility of all substances soluble in water.
The Merus rings are installed in this open circuit. We install Bio Rings, because with these 2 problems can be tackled. We reduce the growth of algae and at the same time increase the oxygen in the water.