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Communication Dans Un Congrès Année : 2023

Reconstructing the growth and feeding of the scallop Mimachlamys varia: a DEB application

Résumé

For several years, toxic blooms of micro-algae of the Pseudo-nitzschia genus have been occurring regularly on the French coast. The domoic acid toxin produced by these algae is then bioaccumulated in the tissues of filter-feeding organisms such as bivalves, sometimes making them unfit for human consumption. Pecten maximus, or the King scallop, an important fishery resource in France has the particularity to be a slow depurator, and its fishing can therefore be prohibited for several months following each episode of toxic bloom. A shifting of fishing effort is then possible on another pectinid, the variegated scallop Mimachlamys varia, but its stocks are currently low. In this context, the present study developed for the first time a DEB model for this new species, with the aim to better understand its nutrition, growth and reproduction dynamics. The model development is based on a multi-site 3-year in-situ monitoring in the Bay of Brest (Régnier-Brisson et al., submitted poster), used both for its parameterization and validation. In a second step, the trophic ecology of the variegated scallop was studied by inverting the DEB model, in order to reconstruct the feeding signal from the observed growth dynamics. Comparing to in-situ measurements (fluorimetry monitoring, stable isotope, flux cytometry and chlorophyll analysis), this approach helped us to better understand the trophic ecology of this species. We discuss future uses of this DEB model which could inform management strategies for the species to establish a sustainable fishery.
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hal-04179984 , version 1 (10-08-2023)

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  • HAL Id : hal-04179984 , version 1

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Laure Régnier-Brisson, Eline Le Moan, Thomas Guyondet, Laure Pecquerie, Philippe Cugier, et al.. Reconstructing the growth and feeding of the scallop Mimachlamys varia: a DEB application. 8th International Symposium on Dynamic Energy Budget Theory for Metabolic Organization, Jun 2023, Baton-Rouge, United States. ⟨hal-04179984⟩
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