Abstract
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 208:119-130 (2000) - doi:10.3354/meps208119 Functional descriptions of feeding and energetics of the Pacific oyster Crassostrea gigas in New Zealand Jeffrey S. Ren1,*, Alex H. Ross2, David R. Schiel3 1Centre of Excellence in Marine Ecology and Aquaculture, PO Box 8602, Christchurch, New Zealand 2National Institute of Water and Atmospheric Research, PO Box 8602, Christchurch, New Zealand 3Department of Zoology, University of Canterbury, Private Bag 4800, Christchurch, New Zealand *E-mail: j.ren@niwa.cri.nz ABSTRACT: 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 varying 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 extraction efficiency of particles from water. The filtration rate was found to be a Type 2 hyperbolic function 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 relationship to body size and increased over the range of experimental temperatures. KEY WORDS: Pacific oyster · Clearance · Ingestion · Absorption · Oxygen consumption Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 208. Online publication date: December 08, 2000 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2000 Inter-Research.
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