Moulting Frequency of a Deep-sea Crustacean, Euphausia pacifica

Abstract

MOST of the observations on moulting in crustaceans have been confined to littoral animals kept in aquaria¹. Because planktonic, deep-sea crustaceans are difficult to maintain in the laboratory there has been virtually no information available on moulting frequency in these forms. In connexion with experiments designed to determine filtering rates and the quantitative aspects of carbon metabolism in the deep-sea planktonic euphausiid shrimp, Euphausia pacifica², observations were made on the moults and moulting frequency of this animal.