Anatomical and functional relationships of the commensal oyster, Ostrea permollis, to its host sponge were studied and common associates, especially predators, were identified. O. permollis larvae were reared for study of responses to: host sponge, non-host sponges, and
shell. Recruitment in inshore waters was detected by presence of O. permollis spat on S. grubii during June and November of the years studied. Age-groups were identifiable in size-frequency histograms for over a year following recruitment.
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