A qualitative and quantitative study of the reproductive cycle of the giant scallop, Placopecten magellanicus, in the Bay of Fundy (New Brunswick, Canada)

Abstract

The reproductive activity of a nearshore giant scallop (Placopecten magellanicus) population in the Bay of Fundy was studied over a 17-month period using qualitative histological staging, quantitative stereology, and gonosomatic index techniques. The major spawning period extended from August to late September in both years, and no winter resting period was observed. Larval metamorphosis and settlement from this major spawning could be expected from early September to early October. Histological examination revealed that 33% of the males sampled were in advanced stages of maturity in December and January. Although direct histological observation and stereology provide the most information, the gonosomatic index coupled with macroscopic gonad examination allows a rapid and accurate assessment of reproductive activity.