The mussel spends its larval, or glochidial, stage attached to the gills of salmonid fishes. The larvae attach themselves during mid- to late-summer and drop off the following spring to settle in the riverbed gravel where they grow to adulthood i.e., five years old. This species does not reach reproductive maturity until it reaches between 7 and 15 years old, and may live for over 100 years.
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