Aspects of growth, recruitment and conservation of the brown mussel Perna perna along the Tsitsikamma coast.

Abstract

Mussels reach a length of 30-40mm by the end of their 1st year, and the majority probably exceed 50mm at 2yr of age. Secondary settlement of plantigrades occurs from mid-spring through early winter, especially in summer and early autumn, and growth of adult forms is slowest prior to this settlement. Settlement occurs serially and powerful cohorts may be formed. At Nature's Valley density and biomass of mussels inside the park's boundary are significantly higher than in non-protected areas. Older age groups are also more abundant within the park. -from Authors