Méthode de détermination de l'âge, longévité et croissance annuelle de Bithynia tentaculata L. (Gastropoda: Prosobranchia) dans le Saint-Laurent (Québec)

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Abstract
In the St. Lawrence River, shells of Bithynia tentaculata bear annual growth lines that form at the end of each winter. These lines allow accurate determination of age since they can be easily counted and are present in all types of habitat. Longevity was determined by this method: B. tentaculata lives about 32 to 39 months and can sometimes reach 48 to 51 months of age. Annual growth is more important during the 2nd than during the 1st year (4.0 mm and 300 mm, respectively) and it is reduced during the 3rd year (0.7 mm).[Journal translation]

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