Effect of Habitat on Growth Indices in the Ribbed Mussel, Modiolus (Arcuatula) demissus

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Abstract
The growth indices of the ribbed musselModiolus demissus from bridge pilings and marsh mud at Lewes, Delaware, are investigated. The ratio of shell height to shell length of marsh mussels is different from that of bridge mussels, but the same as that of Georgia marsh mussels. Excellent allometric relationships exist between the shell height of the mussel and all of its weights (total live, total dry, dry shell, live meat, and dry meat). The allometric relationships are the same for marsh and bridge mussels and have value as prediction equations. There is no relationship between the intertidal height and the shell-weight/meat-weight ratio.

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