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Coelho R., Macias D., de Urbina J. O., Martins A., Monteiro C., Lino P. G., Rosa D., Santos C. C., Bach Pascal, Murua H., Abaunza P., Santos M. N. (2019). Local indicators for global species : pelagic sharks in the tropical northeast Atlantic, Cabo Verde islands region. Ecological Indicators, 110, art. 105942 [14p.]. ISSN 1470-160X

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Lien direct chez l'éditeur doi:10.1016/j.ecolind.2019.105942

Titre
Local indicators for global species : pelagic sharks in the tropical northeast Atlantic, Cabo Verde islands region
Année de publication2019
Type de documentArticle référencé dans le Web of Science WOS:000507381800089
AuteursCoelho R., Macias D., de Urbina J. O., Martins A., Monteiro C., Lino P. G., Rosa D., Santos C. C., Bach Pascal, Murua H., Abaunza P., Santos M. N.
SourceEcological Indicators, 2019, 110, p. art. 105942 [14p.]. p. art. 105942 [14p.] ISSN 1470-160X
RésuméPelagic sharks are an important bycatch in pelagic fisheries, especially for drifting longlines targeting swordfish. In the Cabo Verde Archipelago (tropical NE Atlantic), pelagic shark catches can reach a significant proportion of the total catches. Due to the increased concern on the status of pelagic shark species, this study was developed to enhance the current knowledge of those sharks in the Cabo Verde region in comparison to the adjacent areas, especially associated with European Union (EU) pelagic longline fishing activity. Stock status indicators for the two main species, blue shark (Prionace glauca) and shortfin mako (Isurus oxyrinchus), were developed, based on fisheries data from logbooks and onboard scientific observers, including analysis of size frequency distributions and standardized catch-per-unit-of-effort (CPUE) indexes over time. The standardized CPUEs have been stable or increasing for both species in the past 10 years, indicating no signs of local depletion. In terms of sizes, the blue shark catch is composed mainly of adults, which can be a sign of a stable population. On the contrary, the catch of shortfin mako is composed mainly of juveniles, which in conjunction of a decrease of mean size might be a cause of concern, highlighting possible overfishing on the species in the region. Thirty satellite tags, 25 archival miniPATs and 5 SPOT GPS, were deployed in the Cabo Verde Exclusive Economic Zone (EEZ), showing that those species are highly mobile. The biomass and size distributions were modeled with spatial and seasonal models (GAMs) identifying locations where juveniles are predominantly concentrated and that should be prioritized for conservation. This work presents new information on the status of pelagic sharks in the Cabo Verde region in the context of those highly migratory species, and can now be used to promote more sustainable fisheries in the region.
Plan de classementEcologie, systèmes aquatiques [036] ; Ressources halieutiques [040] ; Télédétection [126] ; Sciences fondamentales / Techniques d'analyse et de recherche [020]
Descr. géo.ATLANTIQUE ; CAP VERT ILES ; ZONE TROPICALE
LocalisationFonds IRD [F B010077814]
Identifiant IRDfdi:010077814
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010077814

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