HELCOM RED LIST Biotope Expert Team
Baltic bottoms in the aphotic zone with at least 90 % coverage of rock, boulders or stones of more than 63 mm in diameter. Sessile/semi-sessile epibenthic bivalves cover at least 10 % of the seabed and more than other perennial attached erect groups.
Substrate is rock and boulders. Depth is typically from approximately20 meters and deeper.
Diversity, abundance and biomass of fauna.
Whole Baltic Sea
2.1 Rocky bottoms
2.1.1 Aphotic zone
2.2 Stony bottoms
2.2.1 Aphotic zone
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HELCOM HUB: Technical Report on the HELCOM Underwater Biotope and habitat classification BSEP 139