Feeding of Crassostrea gigas at high seston load : modeling requirements

Type Contract report
Date 1993-03
Language English
Ref. Contract n° AQ2500 - Ifremer 91/1211406/NF
Author(s) Barille Laurent1, Prou JeanORCID1
Affiliation(s) 1 : Ifremer, France
Note In : Trophic Capacity of an estuarine ecosystem : determination of biological criteria for the management of cultived populations of oysters and their socio economical consequences.
Keyword(s) Matematical model, Oyster, Crassostrea gigas, Clearance rate, Seclection efficency, Marennes Oleron, Charente Maritime
Abstract Ecophysiological experiments conducted in situ in the Bay of Marennes-Oléron during a spring and neap tide cycle in May 1991 , were designed to get a better representation of 2 important components of the energy budget of the Japanese oyster Crassostrea gigas : clearance rate and selection efficiency. The relationships previously established by Raillard et al. ( 1993) are re-evaluated by integrating the effects of high seston loads, typical of tidal effect within estuaries, on the physiological processes. For the clearance rate, the re-evaluated parameterization includes: - a negative effect of turbidity. - a clogging threshold set to 192 mg/l. Selection efficiency parameterizations are modified by incorporating : - a constant inorganic ingestion for increasing seston load, set to 17 % of the inorganic filtered ration. - an upper selection threshold for the paticulate organic matter set to 160 mg/l. The oyster growth model should be enhanced by integrating theses new equations built-up on realistic field conditions.
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