You have a "shrimp".
Abdomen not "tugged in", with distinct swimming legs; long flagellum on 2nd antennae; claws not particularly large.
There are no introduced species in Nordic waters (see Introduction to Decapoda)
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The database as a whole is to be cited as follows:
NOBANIS. Available from http://www.NOBANIS.org. Data of access x/x/201x