ABSTRACT
Morphometrical and age data on the echinoid Echinus esculentus L. are compared for two locations in Irish coastal waters. Ageing was effected by a new acid etching technique. A pronounced differential in growth rate is demonstrated, with apparent retardation at one site being provisionally attributed to curtailment of the algal food supply. Age-associated migratory behaviour is suggested for the same site, with depth ranging being affected by local conditions.
