a grey sea slug among sea anemones in the oslo fjord

invertebrate underwater papillosa anemones aeolidia organism aquarium seafood norway animal yellow flower fjord coral grey slug oslo amom reef fish food sea nudibranch fjord oslo fjord sea life arctic rhinophore cerata gills pink slug marine life cold sea dark water subarctic norwegian marine life macro scandinavian slugs life fjords cold water diving aeolidia papillosa grey sea slugs sea anemones metridum senile