Kotka Divers has sometimes chance to dive in Maretarium aquarium. There you can meet the most of the Finnish fish species. Some species you may see both as small juveniles as old adults. Fish in Maretarium live according to the Finnish four seasons. If you are lucky enough, you may see spawnings. February is a spawning time for burbot and four-horned sculpin, spring for lamprey, ide, bream, perch and vimba bream, summer for three-spined stickleback, gudgeon and pikeperch, autumn for brown trout and Atlantic salmon.