Association dynamics of tuna and purse seine bycatch species with drifting fish aggregating devices (FADs) in the tropical eastern Atlantic Ocean

Type Article
Date 2020-06
Language English
Author(s) Tolotti Mariana Travassos1, Forget Fabien1, Capello Manuela1, Filmalter John David2, Hutchinson Melanie3, Itano David4, Holland Kim5, Dagorn Laurent1
Affiliation(s) 1 : MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Sète, France
2 : South African Institute for Aquatic Biodiversity, Grahamstown, South Africa
3 : Joint Institute for Marine and Atmospheric Research, University of Hawaii, Honolulu, HI, USA
4 : 689 Kaumakani Street, Honolulu, HI, USA
5 : Hawaii Institute of Marine Biology, University of Hawaii at Manoa, Kaneohe, HI, USA
Source Fisheries Research (0165-7836) (Elsevier BV), 2020-06 , Vol. 226 , P. 105521 (12p.)
DOI 10.1016/j.fishres.2020.105521
WOS© Times Cited 4
Keyword(s) Behavior, Acoustic telemetry, Residence time, Floating objects, Pelagic fish, Tropical tuna
Abstract

Several pelagic fish species are known to regularly associate with floating objects in the open ocean, including commercially valuable species. The tuna purse seine industry takes advantage of this associative behavior and has been increasingly deploying free-drifting man-made floating objects, also known as fish aggregating devices (FADs). Using passive acoustic telemetry, this study describes the associative dynamics of the main targeted tropical tuna species (Thunnus albacares, T. obesus and Katsuwonus pelamis), as well as three major bycatch species, silky shark (Carcharhinus falciformis), rainbow runner (Elagatis bipinnulata) and oceanic triggerfish (Canthidermis maculata). Short-term excursions away from the FADs were frequently performed by all tuna species as well by silky sharks. These excursions were characterized by a marked diel pattern, mainly occurring during nighttime. Rainbow runners and oceanic triggerfish were much more present at the FADs and rarely performed excursions. Average continuous residence times (CRTs) ranged from 6 days, for silky shark, up to 25 days for bigeye tuna. Similar to silky shark, average CRTs for skipjack tuna and oceanic triggerfish were less than 10 days. For yellowfin tuna and rainbow runner, CRTs averaged 19 and 16 days, respectively. Bigeye and yellowfin tuna remained associated to a single drifting FAD for a record of 55 days and 607 km traveled.

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Tolotti Mariana Travassos, Forget Fabien, Capello Manuela, Filmalter John David, Hutchinson Melanie, Itano David, Holland Kim, Dagorn Laurent (2020). Association dynamics of tuna and purse seine bycatch species with drifting fish aggregating devices (FADs) in the tropical eastern Atlantic Ocean. Fisheries Research, 226, 105521 (12p.). Publisher's official version : https://doi.org/10.1016/j.fishres.2020.105521 , Open Access version : https://archimer.ifremer.fr/doc/00609/72077/