HELCOM RED LIST Biotope Expert Team
Baltic bottoms in the photic zone with at least 90 % coverage of hard clay.
Salinity range: All; Exposure range: All; Depth range: Photic zone
Barnea candida, Mytilus spp.
Photic zone bottoms of hard clay
Loose sediment covering the seabed will decrease the quality.
Whole Baltic Sea
Silting caused by eutrophication, dredging spoil deposition etc.
HELCOM 1998: 2.3 Hard clay bottoms
2.3.2 Sublittoral photic zone
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