Abstract
Hatchery-reared Crassostrea gigas and Ostrea edulis weighing between 0.001 and 11.1 g were grown in outdoor pumped upwelling systems supplied either with natural sea water or with sea water enriched with chemical fertilizers. The effect of water flow rate within the range of 10 to 50 ml min −1 g −1 was also tested with small spat (0.004–0.013 g). Growth rate of small spat and condition index and carbohydrate content of the flesh of all sizes tested was generally enhanced in fertilized water. Optimum growth occurred at flow rates of 20–30 ml min −1 g −1 in fertilized water and 30–50 ml min −1 g −1 in unfertilized water. Once planted in the sea, spat grown in fertilized water showed no evidence of faster growth or better survival than spat growth in unfertilized water.
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