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The Shell of Cardium Edule, Cardium Glaucum and Ruditapes Philippinarum: Organic Content, Composition and Energy Value, As Determined by Different Methods

Published online by Cambridge University Press:  11 May 2009

P. Goulletquer  and
M. Wolowicz
P. Goulletquer
Affiliation:
IFREMER, Laboratoire National Ecosystèmes Conchylicoles, B.P. 133, 17390 La Tremblade, France
M. Wolowicz
Affiliation:
IFREMER, Laboratoire National Ecosystèmes Conchylicoles, B.P. 133, 17390 La Tremblade, France
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Extract

The organic content of the shells of molluscs can represent a significant fraction of the total organic content (Bernard, 1974) but it is often neglected in calculations of energy budgets in these animals. This may be in part due to uncertainty about the true values, since published estimates of the organic content of shells show quite wide variation. The species examined and also the provenance of the selected samples contribute to this variation as does also the method of measurement. The methods principally used have been by ignition at various temperatures from 400 to 550°C for various durations between 2 and 36 h (see Shumway & Newell, 1984; Jørgensen, 1976; Mohlenberg & Kiorboe, 1981; Vahl, 1981; Shafee, 1979; Price et al, 1976) or by acid extraction using different extraction proceedures (see Ivell, 1979; Dame, 1972; Horn, 1986; Griffiths & King, 1979). To calculate the energy content of the organic component some investigators have used the Hughes (1970) coefficient of 5.037 cal mg-1, while others have used Paine's (1971) protein coefficient of 2.39 J g-1. Wilbur & Saleuddin (1983) have called attention to the need for more study of these analyses. We present here the results of a study of the shell organic content of three species of molluscs, using two methods for the measurement and giving data on biochemical composition and energy value.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 69 , Issue 3 , August 1989 , pp. 563 - 572
Copyright
Copyright © Marine Biological Association of the United Kingdom 1989

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