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Polar Biology

, Volume 29, Issue 9, pp 745–753 | Cite as

Mitigation of seabird mortality on factory trawlers: trials of three devices to reduce warp cable strikes

  • B. J. SullivanEmail author
  • P. Brickle
  • T. A. Reid
  • D. G. Bone
  • D. A. J. Middleton
Original Paper

Abstract

Experimental trials were conducted onboard a stern trawler to identify the relative efficacy of three emerging mitigation measures (tori lines, warp scarer and Brady baffler) designed to reduce seabird mortality caused by warp cable strikes. The use of mitigation measures was clearly shown to substantially reduce seabird mortalities from collisions between seabirds and warp cables. Based on an established significant relationship between contact rate and seabird mortality, when using contact rate as an index of mortality there was a clear performance hierarchy of the three measures. Tori lines and the warp scarer were significantly more effective at reducing contacts than the Brady Baffler, whilst tori lines represent a smaller, but still significant, improvement on the warp scarer. While further testing would be required under local environmental and operational conditions, our findings are likely to have application for many trawl fisheries around the world.

Keywords

Mitigation Measure Contact Rate Falkland Island Trawl Fishery Giant Petrel 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The Falklands Conservation Seabirds at Sea Team’s component of the trials was jointly funded by the International Association of Antarctic Tour Operators (IAATO) Save the Albatross Fund, the Falkland Islands Government, Fortuna Ltd., and Peter Harrison MBE and we appreciate their support. The support of the Falkland Islands Fisheries Department (FIFD), especially John Barton MBE (Director of Fisheries) has been critical to these trials. Thanks also to the crews of the Fishery Patrol Vessels Dorada and Sigma, and operators Byron Marine, for transfers. Thanks also to the Australian Antarctic Division and Australian Fisheries Management Authority for supporting our use of their data collection protocols. Tim Stenning provided line drawings and his assistance constructing the warp scarer was vital. Dr. David Agnew (Renewable Resources Research Group, Imperial College) and Dr. Graham Robertson (Australian Antarctic Division) provided helpful feedback on earlier analyses of these data. We are particularly grateful to the management Golden Touza Ltd. and the crew of the Hermanos Touza, particularly Alberto Vazquez (Captain) and Angel (Bosun) for their assistance and support.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • B. J. Sullivan
    • 1
    • 2
    Email author
  • P. Brickle
    • 3
  • T. A. Reid
    • 1
  • D. G. Bone
    • 4
  • D. A. J. Middleton
    • 3
    • 5
  1. 1.Seabirds at Sea Team, Falklands ConservationStanleyFalkland Islands
  2. 2.BirdLife Global Seabird ProgrammeRoyal Society for the Protection of BirdsBedfordshireUK
  3. 3.Falkland Islands Fisheries Department (FIFD)StanleyFalkland Islands
  4. 4.British Antarctic Survey (BAS)CambridgeUK
  5. 5.New Zealand Seafood Industry CouncilWellingtonNew Zealand

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