Margaritifera will margaritifera
The pearl-bearing mussel of fresh water ( Margaritifera will margaritifera (Linnaeus 1758)), or mulette is a mollusc lamellibranche clear rivers of Europe.
This species until the middle of the 20th century was exploited for the production of the pearls of jewelry, before the discovery at the 18th century of tropical pearl-bearing oysters.
The life cycle of the mussel pearl-bearing is associated with that of the Truite fario or with that of the Atlantic Saumon, because the larvae of mollusc develop with the shelter of the gills of these fish. This parasitic phase in general lasts a few weeks, time with the end of which the larva becomes a genuine bivalve in miniature, since it makes to 0,5 Misters mollusc is fixed then on the substrate and continues its growth, to reach its maturity at 20 years.
The longevity of this species is remarkable, since it varies between 20/30 years for the individuals living in hotter water of the south of Europe, with more than 150 years for those of Scandinavia.
External bonds
- program LIFE (Belgium) of pearl-bearing safeguard of the mussel
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