Episodic recruitment of the rock oyster Saccostrea cucullata (Born, 1778) on the Transkei coast

Abstract

An exceptionally good recruitment of the rock oyster Saccostrea cucullata is reported from the Transkei coast. Prior to 1989 individuals smaller than 20 mm accounted for less than 3% of the population. New recruits now account for between 25% and 48% of standing stock. This single recruitment, which is 6 to 31 times the annual mean recorded over the last 6 to 7 years, represents 5 to 37 individuals m⁻². The variable nature of recruitment in this species is discussed in relation to its resistance to exploitation.