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Larval Sulcascaris sulcata from calico scallops, Argopecten gibbus, along the southeast coast of the United States.

Adductor muscles of calico scallops, Argopecten gibbus, collected off the southeastern coast of the United States from May 1982 to December 1984 were examined for the presence of larvae of the parasitic nematode, Sulcascaris sulcata. Infection intensity, prevalence, and larval length were all positively correlated (P less than 0.001) with scallop shell height (age). Prevalence was generally highest in December and lowest in August as a result of yearly trends in the age structure of the scallop population. Prevalence was not influenced by latitude or depth over the ranges examined. The rate of infection of marine molluscs by S. sulcata is generally related to the degree and length of exposure to third-stage larvae, whose distribution is essentially that of the marine turtle definitive host. Thus, over the wide geographic area of the east coast of the U.S., overall rates of infection decrease with increasing latitude.