Abstract
A study has been made on the biology of the sea anemone, Bolocera tuediae (Johnston), its biotope, and the amphipod species associated with it. The study is based on regular sampling in Korsfjorden, western Norway, from August 1967 to November 1968, with occasional samples elsewhere.
Onisimus normani Sars was present in 67 to 80% of the Bolocera collected in Korsfjorden. The incidence of infection showed a distinct seasonal variation, which can be explained by the annual cycle of the amphipod. Up to 20 specimens of Onisimus have been found in a single Bolocera. Small specimens of Bolocera are less frequently and heavily infected than big ones.
Aristias neglectus Hansen was not found in Korsfjorden, but occurred regularly in Bolocera specimens from Raunefjorden. A. neglectus had earlier been reported in association with Porifera, Echinodermata, and Tunicata, but not with Coelenterata.