A series of nine plankton cruises was completed by the research ships ‘Sir Lancelot’ and ‘Platessa’ in the spring of 1954 to study the ecology of a patch of Calanus finmarchicus (Gunner.) off the north-east coast of England. This paper will deal with the problems encountered in identifying such a patch over the period from 19 March to 4 June 1954.
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Cushing et al. (1963) studied this question.
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