Trawl fishing impacts on the status of seabed fauna in diverse regions of the globe

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  • Tessa Mazor
    CSIRO Oceans & Atmosphere
  • C. Roland Pitcher
    CSIRO Oceans & Atmosphere
  • Wayne Rochester
    CSIRO Oceans & Atmosphere
  • Michel Kaiser
    Heriot-Watt University, Edinburgh
  • Jan Geert Hiddink
  • Simon Jennings
    International Council for the Exploration of the Sea, Copenhagen
  • Ricardo Amoroso
    University of Washington, Seattle
  • Robert A. McConnaughey
    NOAA, Alaska Fisheries Science Center, Seattle
  • Adriaan Rijnsdorp
    IMARES Wageningen
  • Ana Parma
    CENPAT-CONICET, Puerto Madryn
  • Petri Suuronen
    Natural Resources Institute of Finland, Helsinki
  • Jeremy Collie
    University of Rhode Island
  • Marija Sciberras
    Mediterranean Institute for Advanced Studies (IMEDEA)
  • Lara Atkinson
    South African Environmental Observation Network
  • Deon Durholtz
    Department of Environment, Forestry and Fisheries, Cape Town
  • Jim Ellis
    Centre for the Environment, Fisheries and Aquaculture Science (Cefas)
  • Stefan G. Bolam
    Centre for the Environment, Fisheries and Aquaculture Science (Cefas)
  • Michaela Schratzberger
    Centre for the Environment, Fisheries and Aquaculture Science (Cefas)
  • Elena Couce
    Centre for the Environment, Fisheries and Aquaculture Science (Cefas)
  • Jacqueline Eggleton
    Centre for the Environment, Fisheries and Aquaculture Science (Cefas)
  • Clement Garcia
    Centre for the Environment, Fisheries and Aquaculture Science (Cefas)
  • Paulus Kainge
    Ministry of Fisheries and Marine Resources, Swakopmund
  • Sarah Paulus
    Ministry of Fisheries and Marine Resources, Swakopmund
  • Johannes N. Kathena
    Ministry of Fisheries and Marine Resources, Swakopmund
  • Mayya Gogina
    Leibniz Institute for Baltic Sea Research
  • P. Daniel van Denderen
    Technical University of Denmark
  • Aimee Keller
    Northwest Fisheries Science Center (NWFSC), Seattle
  • Beth Horness
    Northwest Fisheries Science Center (NWFSC), Seattle
  • Ray Hilborn
    University of Washington, Seattle
Bottom trawl fishing is a controversial activity. It yields about a quarter of the world's wild seafood, but also has impacts on the marine environment. Recent advances have quantified and improved understanding of large‐scale impacts of trawling on the seabed. However, such information needs to be coupled with distributions of benthic invertebrates (benthos) to assess whether these populations are being sustained under current trawling regimes. This study collated data from 13 diverse regions of the globe spanning four continents. Within each region, we combined trawl intensity distributions and predicted abundance distributions of benthos groups with impact and recovery parameters for taxonomic classes in a risk assessment model to estimate benthos status. The exposure of 220 predicted benthos‐group distributions to trawling intensity (as swept area ratio) ranged between 0% and 210% (mean = 37%) of abundance. However, benthos status, an indicator of the depleted abundance under chronic trawling pressure as a proportion of untrawled state, ranged between 0.86 and 1 (mean = 0.99), with 78% of benthos groups > 0.95. Mean benthos status was lowest in regions of Europe and Africa, and for taxonomic classes Bivalvia and Gastropoda. Our results demonstrate that while spatial overlap studies can help infer general patterns of potential risk, actual risks cannot be evaluated without using an assessment model that incorporates trawl impact and recovery metrics. These quantitative outputs are essential for sustainability assessments, and together with reference points and thresholds, can help managers ensure use of the marine environment is sustainable under the ecosystem approach to management.

Keywords

  • benthic invertebrates, ecosystem-based fisheries management, risk assessment, species distribution modelling, sustainable fisheries, trawling
Original languageEnglish
Pages (from-to)72-86
JournalFish and Fisheries
Volume22
Issue number1
Early online date14 Sept 2020
DOIs
Publication statusPublished - Jan 2021

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