The effect of environmental parameters (temperature, salinity and Chl a) upon the condition,
reproductive activity and biochemical composition of Crassostrea gigas (Thunberg) in
suspended culture in El Grove, Galicia, north-western Spain, was studied over 16 months.
Histological study of the gonad revealed two spawning periods. The first spawn took place in
June–July, coinciding with the predicted time of ripening. Despite the low water temperature
(16° C), a second spawn occurred in October, coinciding with a major phytoplanktonic …