You most likely have a Cydippida (native species - the Arctic cydippid species Mertensia ovum is native to northern Norwegian waters, but may be introduced into the northern Baltic Sea) or larval form of Lobate ctenophores.
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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