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| Baidai, Yannick; Dagorn, Laurent; Gaertner, Daniel; Denebourg, Jean-louis; Duparc, Antoine; Floch, Laurent; Capello, Manuela. |
| This paper presents an associative behavior-based abundance index (ABBI) providing direct estimates of the abundance of yellowfin tuna (Thunnus albacares) based on their associative behavior around floating objects (FOBs). Considering the associative dynamics of small yellowfin tuna individuals (<10 kg) at FOBs through residence and absence times at FOBs, together with acoustic data obtained from fisher’s echosounder buoys, the ABBI index is derived for yellowfin tuna in the western Indian Ocean over the period 2013-2019. This index accounts for both the FOB-associated and free-swimming components of the tuna populations, as well as for the effects of increasing numbers of FOBs on each component. |
| Tipo: Text |
Palavras-chave: Abundance Index; Associative behavior; FADs; Yellowfin tuna. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00693/80507/83718.pdf |
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| Véras, Luísa Queiroz; Capello, Manuela; Forget, Fabien; Tolotti, Mariana Travassos; Véras, Drausio Pinheiro; Dagorn, Laurent; Hazin, Fábio Hissa. |
| Catches of pelagic fish associated to anchored Fish Aggregating Devices have been responsible for increases in income, fish consumption, and even cultural identity of artisanal fishing communities in many developing countries worldwide. Nonetheless, in Brazil, aFAD fishing is still poorly developed and studied. In this experiment, FADs were anchored offshore the city of Recife (Northeastern Brazil) to investigate the potential of moored buoys in the aggregation of commercially important pelagic species near the coast, as an alternative fishing site for artisanal fishers. The behavior of acoustically tagged fish was investigated to assess whether they were attracted to the FADs and how long they remained associated to them. The results indicated that,... |
| Tipo: Text |
Palavras-chave: Associative behavior; Acoustic tagging; Moored FADs; Pelagic fish; Artisanal fishing. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00665/77751/79875.pdf |
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| Pérez, Geraldine; Dagorn, Laurent; Deneubourg, Jean-louis; Forget, Fabien; Filmalter, John D.; Holland, Kim; Itano, David; Adam, Shiham; Jauharee, Riyaz; Beeharry, Sunil P.; Capello, Manuela. |
| Background Aggregation sites represent important sources of environmental heterogeneity and can modify the movement behavior of animals. When these sites are artificially established through anthropogenic actions, the consequent alterations to animal movements may impact their ecology with potential implications for their fitness. Floating objects represent important sources of habitat heterogeneity for tropical tunas, beneath which these species naturally aggregate in large numbers. Man-made floating objects, called Fish Aggregating Devices (FAD), are used by fishers on a massive scale to facilitate fishing operations. In addition to the direct impacts that fishing with FADs has on tuna populations, assessing the effects of increasing the numbers of FADs... |
| Tipo: Text |
Palavras-chave: Acoustic tagging; Associative behavior; Density of floating objects; Movement behavior; Tropical tuna. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00659/77137/78454.pdf |
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