2017•Biology BulletinRequires access

The populations of the freshwater pearl mussel, Margaritifera margaritifera (Linnaeus, 1758), and the thick shelled river mussel, Unio crassus Philipsson, 1788, in Latvia

Mudıte Rudzıte, Māris Rudzītis, Jānis Birzaks

Abstract

The populations of two endangered species—the freshwater pearl mussel Margaritifera margaritifera and the thick shelled river mussel Unio crassus in Latvia were studied. The specimens were counted, measured, population density and age structure were calculated. The possible host fish presence was found.

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Key concepts: Margaritifera, Mussel, Biology, Pearl, Fishery, Endangered species, Population, Bivalvia