Seasonal changes in tissue weight and biochemical composition for the bivalve Donax trunculus L. on the Algerian coast |
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| Authors: | A.D. Ansell L. Frenkiel M. Moueza |
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| Affiliation: | The Dunstaffnage Marine Research Laboratory, P.O. Box 3, Oban, Argyll, PA34 4AD, Scotland;Institut de Biologie, U.S.T.A., B.P.9, Dar el Bevola, Algiers, Algeria;Institut National Agronomique, El Harrach, Algiers, Algeria |
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| Abstract: | Seasonal changes in the body weight and composition of the bivalve Donax trunculus L. from Azur Plage near Algiers, Algeria, were studied during the period September 1971-June 1974. Percentage dry tissue weight was minimal in October–December and rose to reach a peak in spring or summer, the rise corresponding with rapid maturation of the gonads. Decrease in tissue weight in the autumn also coincided with a rapid decline maturity of the gonads between August and October. Lipid content increased with sexual maturity, while carbohydrate content was greatest in the autumn and declined to a seasonal minimum in April–May. The changes are compared with those for D. trunculus in other Mediterranean populations, and for D. vittatus (da Costa) elsewhere in Europe. |
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