Developing a science-based framework for the management of drifting Fish Aggregating Devices

Capello, Manuela; Merino, Gorka; Tolotti, Mariana Travassos; Murua, Hilário; Dagorn, Laurent

doi:10.1016/j.marpol.2023.105657

Cited by 6 publications

(3 citation statements)

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“…For example, Pérez et al (2020) used acoustic tagging data on AFAD arrays to demonstrate that when inter-AFAD distance decreases, tuna visit more AFADs and spend less time travelling between AFADs and more time associated with them. Concerning DFADs, as actual densities of drifting floating objects are difficult to obtain, studies using a modelling approach based on experimental data should be promoted (Capello et al, 2023;Pérez et al, 2022). These studies should investigate the consequences of changes in floating object density on tuna school sizes and associative behaviour.…”

Section: What Are the Scientifi C Challeng E S To Fill The K Nowledg ...mentioning

confidence: 99%

“…A major gap in tuna and DFAD science is the lack of time series of key parameters such as the numbers of DFADs and natural floating objects, residence and absence times at DFADs as well as large movements between oceanic regions, school sizes, condition and reproduction indices. The first research priority in this context is to initiate or continue time series of such indicators (Capello et al 2023). Setting long-term monitoring programs in every ocean appears to be a priority, as effects of DFADs could vary depending on the species, the characteristics of each ecosystem and on the density of floating objects.…”

Section: Effects On Reproduction and Growthmentioning

confidence: 99%

“…As such, there is a need to improve our observation and understanding of this associative phenomenon to determine with certainty the impacts of DFADs on the life-history parameters and behaviour of tropical tuna, quantify the magnitude of these impacts, and provide evidence-based advice.A major gap in tuna and DFAD science is the lack of time series of key parameters such as the numbers of DFADs and natural floating objects, residence and absence times at DFADs, as well as large movements between oceanic regions, school sizes, condition, and reproduction indices. The first research priority in this context is to initiate or continue time series of such indicators(Capello et al, 2023).…”

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The challenge of assessing the effects of drifting fish aggregating devices on the behaviour and biology of tropical tuna

Dupaix,

Ménard,

Filmalter

et al. 2024

Fish and Fisheries

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Fishers have intensively used drifting fish aggregating devices (DFADs) over the last three decades to facilitate their catch of tropical tunas. DFADs increase purse‐seine efficiency, potentially increasing tuna fishing mortality. They could also have impacts on tuna natural mortality and reproductive potential, and assessing the consequences of their presence at sea on tuna populations is a challenge. The use of DFADs results in a major increase in the number of floating objects, which are spatially heterogeneous at sea. To date, no converging scientific results exist regarding the effects of DFADs on the large‐scale movements and behaviour of tuna, mainly due to the difficulty of disentangling the respective roles of DFADs and environmental factors. Some biological indices show that tuna condition is lower when associated to a floating object than in a free‐swimming school. However, it is not clear whether this is the cause or the consequence of the association nor if it has long‐term effects on individuals' fitness. Further scientific progress requires (i) the collection of time series of indicators to monitor habitat change, individual behaviour, individual fitness, and population dynamics and (ii) experimental studies to identify the underlying behavioural and biological processes involved in associative behaviour. The extent of the modification of the surface habitat by the massive deployment of DFADs and the current uncertainty of the possible long‐term consequences on the individual fitness and dynamics of tuna populations argue for the need for increased awareness of this issue by Regional Fisheries Management Organisations regulating tuna fishing.

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Section: What Are the Scientifi C Challeng E S To Fill The K Nowledg ...mentioning

confidence: 99%

Section: Effects On Reproduction and Growthmentioning

confidence: 99%

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confidence: 99%

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