Fish Genetics Laboratory (FiskGen)

Last changed: 15 October 2020
The genetic laboratory at the Department of Aquatic Resources. Photo.

At the fish genetics laboratory (FiskGen) we perform genetic analyses of fish and crayfish, as part of environmental monitoring, within research projects and on behalf of others. FiskGen is situated at the Institute of Freshwater Research at Drottningholm where we focus mainly on identifying the genetic population structure of resource species and endangered species. The Swedish Agency for Marine and Water Management, county administrative boards, municipalities, fishing associations, fisheries conservation area associations and fish hatcheries, engage FiskGen. Welcome to contact us!

Most fish and shellfish species are divided into genetically distinct populations (local stocks). Knowledge of species’ genetic structure is important both for long-term sustainable fish management and for preserving genetic diversity in our fish fauna.

Effects of fish stocking

We also study genetic and ecological effects of fish stocking, and investigate how fishing may affects important traits such as growth and age at reproduction. We further monitor the genetic status of endangered species and cultivated stocks, together with our clients and in collaboration with our ageing laboratories.

Read more about how SLU uses the results from our genetic studies in fisheries management and research.


At FiskGen, we primarily use so-called microsatellites as genetic markers. Species analyzed so far are salmon, trout, pikeperch, grayling, catfish (wels), char, whitefish, vendace, eel, crayfish, eelpout and flounder. Often there is access to genetic reference data sets from previous studies, which provides increased opportunities to study various questions.

Hire the fish genetics laboratory!

At FiskGen, we perform genetic analyzes on behalf of authorities, fisheries conservation area associations, fish farms and others. Feel free to contact us regarding your questions where a genetic analysis may be relevant, and for price information!

Noble crayfish is analyzed at FiskGen. Photo.
At FiskGen, noble crayfish from different populations are DNA-analyzed. The results form a basis for the species’ management. The noble crayfish is classified as critically endangered according to the Swedish Red List 2020 (SLU, ArtDatabanken).
FiskGen's laboratory analyses are based on a small piece of tissue (e.g. fin-clips or scales) that are treated so that the genetic material (DNA) becomes available for further analysis without being broken down.
FiskGen's "genetic analyzer" analyses fragment-lengths of 96 individual samples at a time. The raw results consist of combinations for so-called alleles (variants of “genes”) carried by each studied individual.


Johan Dannewitz, Stefan Palm, Linda Söderberg och Johan Östergren


Stefan Palm, Researcher
Department of Aquatic Resources, Institute of Freshwater Research, SLU, +46 10 478 42 49

Linda Söderberg, Laboratory Engineer
Department of Aquatic Resources, Institute of Freshwater Research, SLU, +46 10 478 42 68

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