Parameter estimation for the variegated scallop, Mimachlamys varia, an exploited bivalve, for a better understanding of its life cycle - Archive ouverte HAL Accéder directement au contenu
Poster De Conférence Année : 2023

Parameter estimation for the variegated scallop, Mimachlamys varia, an exploited bivalve, for a better understanding of its life cycle

Résumé

The variegated scallop, Mimachlamys varia, is historically a fishing resource in some areas of the French Atlantic coast. Nevertheless, since the 1970s its stocks have declined, leading nowadays to fishing restrictions and/or interdictions, particularly in the Bay of Brest. In order to support M. varia sustainable fishing activities, it is important to understand its ecology and population dynamics. However, few information on this species is currently available. As part of the French MaSCoET project, a 2.5-years in-situ monitoring was realised in the Bay of Brest. It examined growth in length and weight of two cohorts, as well as their gonado-somatic index, coupled with environmental conditions. The present study aims to better understand the link between the environment and the organism’s physiology. Using a Dynamic Energy Budget model, we further investigated the life cycle of M. varia. The parameters were estimated with the AmP procedure, using the Tinduff hatchery data as zero-variate data and the early stages’ growth. The first cohort growth data from the in-situ monitoring was used as uni-variate data for adults. The originality of our study is that we were able to validate the model using the second cohort monitoring data. This model will be used for the investigation of (i) the trophic ecology of this species in three contrasted locations within the Bay of Brest using a model inversion approach (Régnier-Brisson et al. submitted oral communication) and (ii) the contamination and decontamination by domoic acid (phycotoxin) using a coupled kinetic model (Le Moan et al., submitted poster).
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Dates et versions

hal-04179986 , version 1 (10-08-2023)

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  • HAL Id : hal-04179986 , version 1

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Laure Régnier-Brisson, Eline Le Moan, Jonathan Flye-Sainte-Marie, Philippe Cugier, Aline Blanchet-Aurigny, et al.. Parameter estimation for the variegated scallop, Mimachlamys varia, an exploited bivalve, for a better understanding of its life cycle. 8th International Symposium on Dynamic Energy Budget Theory for Metabolic Organization, Jun 2023, Baton-Rouge, United States. ⟨hal-04179986⟩
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