Abstract
In Terra Nova Bay, the scallop Adamussium colbecki (Mollusca Bivalvia) constitutes large beds up to 70–80m in depth, reaching high values of density (50–60 ind m−2) and biomass (120 g m−2 DW soft tissues). Its population structure and biometrics have been studied during the summer of 1989/90, 1993/94, 1994/95 and 1995/96. The population of A. colbecki was studied in terms of abundance values and of size frequency distribution (modal length class: 70–75 mm). The growth rate of this species was assessed by X-ray methods and averaged 8 mm year−1. Biometrical measures were performed in order to assess the influence of the summer increase in food supply on the life cycle of the scallop, showing a strong coupling between food supply and gonad development. On the basis of the gonadosomatic index values (GSI) and of the occurrence of planktonic larvae some speculations are made on the reproductive behaviour of this scallop.
Published Version
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