HELCOM RED LIST Biotope Expert Team
Baltic photic bottoms at least 90 % coverage of hard clay. Epibenthic bivalves cover 10% of the seabed, of which Mytilidae constitutes at least 50 % of the biomass.
Substrate is hard clay.
Mytilus spp., Modiolus modiolus
2.3 Hard clay bottoms
184.108.40.206 Hard clay bottoms with little or no macrophyte vegetation
OSPAR list of threathened biotopes:
Modiolus modiolus beds
- Habitat occurs in the OSPAR Region II (including Kattegat) and is listed threatened and/or declining in this region
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