The Horse mussel (Modiolus modiolus)
is found on cliffs and gravel bottoms in deeper water along the Swedish
west coast as far south as the Öresund
between Denmark and Sweden. It resembles the Blue mussel, but is brown
(as opposed to blue), and is more obtuse on its pointed end. In southern
Europe (i.e. Mediterranean) another species is present, Mytilus galloprovincialis,
that is very similar to the Swedish Blue mussel.
From left to right. The Blue mussel and a Horse mussel.
Some researchers are of the opinion that
the Blue mussel in the Baltic is another species (Mytilus trossulus)
that is found for example in Canada, but at the present it is still uncertain.
The Blue mussel is important in different forms of aquaculture
in both Sweden and abroad.
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