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                  <gco:CharacterString>Le suivi des déchets sur le fond a été réalisé à partir des protocoles d’échantillonnages du programme européen International Bottom Trawl Survey IBTS et de la campagne scientifique internationale de chalutage en Méditerranée MEDITS.
L’observation des déchets sur le fond a été réalisée lors des opérations de chalutage des campagnes d’évaluation des stocks de poissons démersaux :durant les  campagnes halieutiques : CGFS, EVHOE, IBTS, MEDITS 2015 à 2020, ORHAGO 2017 à 2020 et durant les campagnes nourriceries : NOURCANCHE 2018 et 2020, NOURMED 2018 et 2019, NOURMONT 2018 à 2020, NOURSEINE 2020, NOURSOM 2019 et 2020, NOURVEYS 2019 et NURSE 2018 à 2020.
Les déchets présents dans le cul du chalut sont remontés à bord puis catégorisés, dénombrés, pesés et mesurés suivant les protocoles prescrits. La stratégie spatiale d’échantillonnage représente plus de 200 stations de chalutage sur les marges des sous-régions marines. 
La durée des traits et leur nombre par campagne n'étant pas identique, la première étape du traitement des données a été de calculer la surface observée/échantillonnée par trait/leg d’observation. A partir de la surface observée/échantillonnée, le nombre de déchets ramenés au kilomètre carré a été calculé pour chaque trait/leg. La densité de déchets par maille de trois milles nautiques de côté a été estimée, en partie selon la méthode proposée dans García-Rivera et al. (2017) et Gerigny et al. (2019).</gco:CharacterString>
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