In smolt farms, active biofilters with nitrifying bacteria are important to cleanse the water of nitrogen that the fish secretes through the gills. If nitrifying bacteria are not present or insufficient, there is a danger that the content of, for example, ammonium, ammonia or nitrite will be too high and thus become toxic to the fish.
The biotech department conducts studies on biofilters, investigating whether the right nitrifying bacteria are present in the biofilters. It is also possible to investigate how many of these bacteria are actively capable of making ammonium into nitrite, and nitrite to nitrate, which is less toxic to the fish. This could be, for example, when new biofilters are introduced, or when difficulties arise in connection with keeping certain nitrogen values sufficiently low in relation to fish health.
Contact person: Heidi S. Mortensen