Misidentification of free school tunas in the AOTTP database: Issues to identify fish-attractive seamounts

Akia Sosthène, Perez Ilan, Guéry Loreleï, Gaertner Daniel. 2022. Misidentification of free school tunas in the AOTTP database: Issues to identify fish-attractive seamounts. Fisheries Research, 251:106324, 7 p.

Résumé : Several studies have shown that the school type at release can significantly influence the amplitude of the movements of a tagged fish. In particular, it has been shown that seamounts can have a retention effect on tuna, suggesting that their migration patterns may differ significantly depending on the school type at release. However, many tuna releases near well-recognised mid-Atlantic seamounts have not been well coded in the ICCAT-AOTTP database. In addition, the 'Free School' type modality was often assigned to individuals tagged or recaptured near a seamount. This paper explored different criteria for identifying seamounts in the tagging database with the aim to correct the questionable coding of certain school types. To do this, we first investigated how to identify "attractive" seamounts based on their morphology and the distribution of catch data from the European purse seine fleet. This conceptual approach led to several problems discussed in this paper and from which we proposed a simple recoding method using the literature results. The correction criteria made it possible to correct the school type of 4.9% of several records of tagged tuna during the ICCAT AOTTP programme.

Mots-clés libres : Seamounts, Tropical tunas, Tagging, Fisheries, Tuna attractivity

Classification Agris : L20 - Écologie animale
M01 - Pêche et aquaculture - Considérations générales
U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

Agences de financement européennes : European Commission, Directorate-General for International Cooperation and Development

Agences de financement hors UE : International Commission for the Conservation of Atlantic tunas, CISEF consortium (Cote d’Ivoire, Cap Vert, Senegal, Spain and France)

Projets sur financement : (EU) Atlantic Ocean Tropical tuna Tagging Programme

Auteurs et affiliations

• Akia Sosthène, Université de Montpellier (FRA) - auteur correspondant
• Perez Ilan, Université de Montpellier (FRA)
• Guéry Loreleï, CIRAD-BIOS-UMR PHIM (FRA) ORCID: 0000-0003-3004-8462
• Gaertner Daniel, Université de Montpellier (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/603735/)

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