Drifting Fish Aggregating Devices (DFADs) as ecological traps: no evidence displayed by a long-term analysis of yellowfin tuna condition - Archive ouverte HAL Access content directly
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Drifting Fish Aggregating Devices (DFADs) as ecological traps: no evidence displayed by a long-term analysis of yellowfin tuna condition

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Abstract

Human-induced habitat modifications can severely impact the biology and behavior of wild species. Drifting Fish Aggregating Devices (DFADs), used by industrial purse seine tropical tuna fisheries, significantly increased the number of floating objects found in the open ocean, with which tropical tuna associate. This habitat change raised concerns over the risk of modifying the behavior and altering the biology of tuna and other associated species (the so-called ecological trap hypothesis). Relying on a time-series of more than 25,000 length-weight samples collected in the western Indian Ocean (1987-2019), we reject the hypothesis that the body condition (Le Cren’s relative condition factor Kn) of yellowfin tuna (Thunnus albacares) decreased concurrently with the increased number of DFADs. This result suggests the absence of negative long-term impacts of DFADs on the biology of tuna. As other factors may have counteracted possible negative effects of DFADs, we recommend a long-term monitoring of habitat, biological and behavioral parameters of tunas to detect any critical change.
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Dates and versions

hal-03690665 , version 1 (08-06-2022)
hal-03690665 , version 2 (07-09-2022)
hal-03690665 , version 3 (17-11-2022)

Identifiers

  • HAL Id : hal-03690665 , version 3

Cite

Amaël Dupaix, Laurent Dagorn, Antoine Duparc, Aurélie Guillou, Jean-Louis Deneubourg, et al.. Drifting Fish Aggregating Devices (DFADs) as ecological traps: no evidence displayed by a long-term analysis of yellowfin tuna condition. 2022. ⟨hal-03690665v3⟩
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