Jonsson, Patrik
- Department of Aquatic Resources (SLU Aqua), Swedish University of Agricultural Sciences
Research article2018Peer reviewedOpen access
Amoroso, Ricardo O.; Pitcher, C. Roland; Rijnsdorp, Adriaan D.; McConnaughey, Robert A.; Parma, Ana M.; Suuronen, Petri; Eigaard, Ole R.; Bastardie, Francois; Hintzen, Niels T.; Althaus, Franziska; Baird, Susan Jane; Black, Jenny; Buhl-Mortensen, Lene; Campbell, Alexander B.; Catarino, Rui; Collie, Jeremy; Cowan, James H., Jr.; Durholtz, Deon; Engstrom, Nadia; Fairweather, Tracey P.;
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Bottom trawlers land around 19 million tons of fish and invertebrates annually, almost one-quarter of wild marine landings. The extent of bottom trawling footprint (seabed area trawled at least once in a specified region and time period) is often contested but poorly described. We quantify footprints using high-resolution satellite vessel monitoring system (VMS) and logbook data on 24 continental shelves and slopes to 1,000-m depth over at least. 2 years. Trawling footprint varied markedly among regions: from <10% of seabed area in Australian and New Zealand waters, the Aleutian Islands, East Bering Sea, South Chile, and Gulf of Alaska to >50% in some European seas. Overall, 14% of the 7.8 million-km(2) study area was trawled, and 86% was not trawled. Trawling activity was aggregated; the most intensively trawled areas accounting for 90% of activity comprised 77% of footprint on average. Regional swept area ratio (SAR; ratio of total swept area trawled annually to total area of region, a metric of trawling intensity) and footprint area were related, providing an approach to estimate regional trawling footprints when high-resolution spatial data are unavailable. If SAR was <= 0.1, as in 8 of 24 regions, there was >95% probability that >90% of seabed was not trawled. If SAR was 7.9, equal to the highest. SAR recorded, there was >95% probability that >70% of seabed was trawled. Footprints were smaller and SAR was <= 0.25 in regions where fishing rates consistently met international sustainability benchmarks for fish stocks, implying collateral environmental benefits from sustainable fishing.
fisheries; effort; footprint; habitat; seabed
Proceedings of the National Academy of Sciences of the United States of America
2018, Volume: 115, number: 43, pages: E10275-E10282
Publisher: NATL ACAD SCIENCES
Conserve and sustainably use the oceans, seas and marine resources for sustainable development
End hunger, achieve food security and improved nutrition and promote sustainable agriculture
Fish and Aquacultural Science
DOI: https://doi.org/10.1073/pnas.1802379115
https://res.slu.se/id/publ/97006