Seasonal variation in two species of unionid clams from Manitoba, Canada: biomass

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Abstract
The relationship between dry weight and shell length for Anodonta grandis and Lampsilis radiata is log dry weight = a + 3.0317 log shell length, where a varies seasonally. Average water content of clams varies seasonally from 83.18% for both species in February and May to 85.02% for L. radiata in July and 87.56% for A. grandis in July and October. Mean ash content of L. radiata (19.21%) is higher than that of A. grandis (12.68%) except in October (20.94%) when marsupia are filled with glochidia. Differences in reproductive timing and length of glochidial retention contribute to some of the seasonal variations in biomass in A. grandis and L. radiata.

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