Positive welfare effects of physical enrichments from the nature-, functions- and feeling- based approaches in farmed rainbow trout (Oncorhynchus mykiss)
2022
Brunet, Valentin | Kleiber, Aude | Patinote, Amélie | Sudan, Pierre-Lô | Duret, Cécile | Gourmelen, Guillaume | Moreau, Emmanuelle | Fournel, Catherine | Pineau, Lionel | Calvez, Ségolène | Milla, Sylvain | Colson, Violaine | Laboratoire de Physiologie et Génomique des Poissons = Fish Physiology and Genomics Institute (LPGP) ; Structure Fédérative de Recherche en Biologie et Santé de Rennes (Biosit : Biologie - Santé - Innovation Technologique)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | JUNIA (JUNIA) ; Université catholique de Lille (UCL) | Biologie, Epidémiologie et analyse de risque en Santé Animale (BIOEPAR) ; École nationale vétérinaire, agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Unité de Recherches Animal et Fonctionnalités des Produits Animaux (URAFPA) ; Université de Lorraine (UL)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | This work was financially supported by the French funding account CASDAR (Compte d'Affectation Spéciale “Développement Agricole et Rural”) under grant agreement n° 19AIP5919.
International audience
Mostrar más [+] Menos [-]Inglés. The present study aimed to investigate whether environmental enrichment had significant effects on rainbow trout's welfare through nature-, functions- and feeling-based approaches. Fish group behavior was analyzed during the rearing phase, as well as growth performance and health status. We assessed individual's emotional reactivity through a novel-tank test by measuring fear-related behaviors and stress-related physiological responses. Fish boldness and neophobia were then evaluated towards a novel object. We showed that more complex environments decreased aggression levels and improved growth, without impacting fish immune status. Enriched fish were also found less fearful when isolated in a novel tank and bolder when facing a novel object. We concluded that complexifying the environment through the addition of physical structures which stimulate and encourage fish to explore promotes rainbow trout's welfare in farming conditions, according to the three different welfare approaches.
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