1.3. Extending and updating global fuel use patterns in tuna fisheries
Like most fisheries, the modern purse seine tuna fishery relies heavily on direct KY02111 fuel inputs for vessel propulsion, gear operation and a vast range of ancillary activities (e.g., onboard freezing, etc.). Tuna fisheries have, in the past, been identified as having a relatively high FUI and, in some circumstances, have been cited as burning markedly greater amounts of fuel than many other fisheries ( Nomura, 1980 and Watanabe and Okubo, 1989). More recent data, however, suggest that tuna fisheries may actually have a lower FUI than most trawling and longlining fisheries ( Hospido and Tyedmers, 2005; Vázquez-Rowe et al., 2011a). While past studies have measured the FUI of individual tuna-fishing vessels or national fleets, to date there has not been a broad, global examination of fuel consumption by the world's tuna fishing fleets.
The primary objective of this paper is to provide novel, in-depth analysis of the FUI of purse seining vessels primarily targeting skipjack and yellowfin tuna. Current energy performance of tuna purse seiners is analysed with respect to species, ocean basin, and other operational characteristics, and compared to previous assessments of tuna fisheries, as well as assessments of other fishery- and non-fishery sources of animal protein. Finally, results are scaled up to estimate the total fuel consumption and carbon footprint of the global purse seine tuna fishing fleet and the role this fishery plays in the context of global energy use and emissions.