, Par ailleurs, pour un même concept, plusieurs types de stimuli seront présentés aux truites afin de s'assurer qu'elles le généralisent. Ils permettront également d'évaluer les capacités visuelles et cognitives de l'espèce Oncorhynchus mykiss. Neuf types de stimuli seront présentés aux truites aux cours du projet

, Pour commencer, les truites appliqueront des concepts en réalisant un choix sur la couleur et/ou la forme (Tableaux 2 et 3). Pour cela, deux gammes variées ont été créées en considérant les capacités des poissons. Pour rappel, les poissons sont capables de reconnaître des formes variées plus ou moins complexes et de différencier les couleurs

, Actuellement, il y a peu de connaissances sur les capacités visuelles de la truite arc-en-ciel

, L'application des concepts sur la couleur et la forme permettront (1) d'identifier si elles sont capables de différencier deux stimuli sur deux critères visuels additionnels. Ces deux critères seront ensuite séparés pour (2) évaluer si elles sont capables de différencier les stimuli sur un seul critère

. Le-choix-de-couleur-permettra, ) d'évaluer si les truites sont capables de visualiser et de discriminer d'autres couleurs que celles déjà étudiées, comme le violet, le rose et le orange, ou encore (5) d'évaluer si elles sont capables de distinguer une gamme de couleur, ici de trois bleus. Le choix sur la forme permettra, ) d'évaluer si la préférence influence l'application des concepts

, Par la suite, les truites réaliseront un choix sur la taille des stimuli, afin (7) d'évaluer leur acuité visuelle. Les stimuli seront affichés à une taille de 100 % ou à une taille de 40 %

, cet exercice sera demandé aux truites. La catégorisation se fera sur des images d'objets présents dans leur environnement: truites, galets, plantes et tubes (Annexe VII). Ces stimuli seront de formes et de couleurs variables pour vérifier si (8) elles catégorisent l, Comme il a été démontré que certaines espèces de poissons sont capables de catégoriser des images (Schluessel, Fricke & Bleckmann, 2012)

. Agrillo, Pour cette raison, des stimuli composés de 1 à 5 formes identiques ou différentes, noires ou en couleur, et de tailles différentes, ont été créés (Annexe VII), Les poissons sont capables de dénombrer sur une numération absolue, 2009.

. Agrillo, la capacité de numération absolue des truites sera évaluée. Pour finir, lors de leur marquage qui a fait suite à la sélection en labyrinthe, chaque truite a été prise en photo et elles le seront encore à 10 mois de vie. Chaque identité et donc chaque groupe d'origine est connu. Certains congénères, issus d'un autre bassin leur sont donc étrangers, reconnaissance des congénères familiers pourra être fait. Cela permettra, 2008.

, Le changement de test ou de type de stimuli aura lieu lorsqu'une truite aura atteint un nombre de réponses correctes stable à 70 % ou plus sur trois sessions consécutives. Les truites, à vous de jouer ! La considération de votre bien-être en dépend !

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