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Pacific oysters Crassostrea gigas were fed a mixed diet of algae and silt over a range of concentrations from 0.8 to 637 mg l -1 , and an organic content ranging from 0.7 to 72%. These data were used to parameterise a set of functions describing the physiological response of oysters to vary- ing environmental conditions. All parameters were standardised to body length. There was greater variation of size-specific clearance rate (CR) standardised to dry tissue weight than to length. CR increased hyperbolically with temperature with a maximum rate (0.24 l h -1 cm -1 ) at 20.7°C. Most feeding experiments were carried out at 10 to 13°C, except for the measurements of temperature effect. CR increased rapidly with increasing seston concentration, peaked at about 10 mg l -1 , above which it consistently decreased. It was modelled as a function of pumping rate of water and extrac- tion efficiency of particles from water. The filtration rate was found to be a Type 2 hyperbolic func- tion of seston concentration within the range tested. Ingestion rate was described as a function of food quantity, quality and selective ingestion of organic particles. A positive effect of organic content on absorption efficiency was found only at a very low organic content of less than 5%, while above this level, absorption efficiency was constant at 86%. Oxygen consumption rate had an allometric rela- tionship to body size and increased over the range of experimental temperatures.

Functional descriptions of feeding and energetics of the Pacific oyster Crassostrea gigas in New Zealand