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Occurrence of pearls in mussels (Mytilus spp.) from the Norwegian coast
Summary
This study investigated pearl formation in mussels from the Norwegian coast, finding surprisingly high numbers of pearls in some individuals and a north-south gradient in occurrence. While primarily about mussel biology, the research contributes to understanding mussel health and their use as sentinel species for marine pollution monitoring.
Mussels (Mytilus spp.) from the Norwegian coast produce pearls, up to as many >360 pearls per individual, and it seems to be a southern-northern gradient with more pearls in mussels from the south than from the north. Out of the 280 mussels studied, nearly 2000 pearls were found, and the mussels producing pearls were all >4 cm. Size and condition index did correlate with the pearl frequency, while microplastics did not. Mussel health is important to study as they are important actors in the coastal ecosystem, as bioindicators for environmental monitoring, as a food source as well as the recent reports on changes in their distribution across the Norwegian coast.