Thus, the total losses due to depredation and whether or not cetaceans perform a selective predation among fish caught in the longline in the SWAO remain unknown.Fishers perceive cetaceans as competitors for the same resource and as the cause of losses to the industry.

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These two currents converge to form the Brazil–Malvinas (Falkland) Confluence, a mixture zone that moves seasonally between 30° and 50°S and 40° and 60°W.

Temperature in the confluence decreases southward from ∼20 to 8°C (Olson Data were collected between 19 by scientific observers from the National Observer Program of the Tuna Fleet (PNOFA).

Uruguayan pelagic longline fishing vessels operate in the Uruguayan Economic Exclusive Zone and international waters, from 19° to 40.5°S and 20° to 54°W (Figure 1), including the shelf brake, continental slope, and deep waters of the SWAO.

This region is characterized mainly by a northern subtropical zone, dominated by warm waters from the Brazil Current (average temperature of 22–23°C) and a southern zone, dominated by Subantarctic waters from the Malvinas (Falkland) Current (average temperature of 6°C) (Brandini , 2000).

) on catches of the Uruguayan pelagic longline fishery in the Southwestern Atlantic Ocean between 19.

Data were collected by scientific observers from the National Observer Program of the Tuna Fleet operating in the area between 19°–40.5°S and 20°–54°W.The use of longlines in fisheries expanded in the late 1950s, when the Japanese fleet started operating in the Atlantic and Pacific Oceans and was successful in fishing for tuna with this gear (Suda, 1971; Honma, 1973).Since then, several species of marine mammals have learned to prey upon fish catch in longlines and depredation has been documented in all oceans (Donoghue , 2013).In the Southwestern Atlantic Ocean (SWAO), depredation by killer whales on pelagic longline fishery occurs frequently (e.g.Secchi and Vaske, 1998; Brum and Marín, 2000; Dalla Rosa and Secchi, 2007).Other cetaceans interacting with longlines in the SWAO are false killer whales (, 2008; Ramos-Cartelle and Mejuto, 2008).