Environmental Science
4 years ago

Tuna behavior at drifting FADs in Indian Ocean reveals surprising patterns

Fisheries Oceanography
Behavior of skipjack (<i>Katsuwonus pelamis</i>), yellowfin (<i>Thunnus albacares</i>), and bigeye (<i>T. obsesus</i>) tunas associated with drifting fish aggregating devices (dFADs) in the Indian Ocean, assessed through acoustic telemetry
Rodney Govinden, Manuela Capello, Fabien Forget, John D. Filmalter, Laurent Dagorn

Paper Summary

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Tunas like skipjack, yellowfin, and bigeye were studied near drifting fish aggregating devices (dFADs) in the Indian Ocean using acoustic telemetry. The researchers found that skipjack tuna can leave dFADs for over 24 hours before returning, while yellowfin tuna can be away for up to 4.07 days. On average, bigeye tuna stay at dFADs for 7.59 days, yellowfin for 6.64 days, and skipjack for 4.58 days. The study showed that tunas have similar probabilities of leaving dFADs regardless of time spent there. Regional differences were observed in the behavior of tunas at dFADs in the Indian Ocean, which can help improve how these devices are managed.