Rory lines : silver lining for seabirds in South Africa's demersal trawl fisheries

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dc.contributor.advisorRyan, Peter Gen_ZA
dc.contributor.advisorWanless, Ross Men_ZA
dc.contributor.advisorMaree, Bronwynen_ZA
dc.contributor.authorRice, Edwarden_ZA
dc.date.accessioned2015-01-01T13:07:06Z
dc.date.available2015-01-01T13:07:06Z
dc.date.issued2012en_ZA
dc.descriptionIncludes bibliographical references.en_ZA
dc.description.abstractSeabird bycatch in commercial fisheries is one of the major factors causing decreases in many seabird populations. In trawl fisheries, high mortalities have been recorded as a result of seabirds being struck by trawl warps (the cables used to tow the trawl net). Tori (bird-scaring) lines have been used to decrease seabird mortality in some trawl fisheries by up to 90%. However, tori lines are not effective at reducing the number of birds that drift towards the trawl warps while feeding on factory discards alongside the vessel. The Albatross Task Force (ATF) helped to develop and test a new device, the Rory Line (RL), to be used in conjunction with tori lines, and designed to reduce warp strikes by placing a physical barrier between the scupper (where factory discards are released) and the danger zone (where the trawl warps enter the water) at the stern of the vessel. This study tests the efficacy of the RL at reducing the number of birds drifting into the danger zone and the number of birds being struck by the trawl warps.en_ZA
dc.identifier.apacitationRice, E. (2012). <i>Rory lines : silver lining for seabirds in South Africa's demersal trawl fisheries</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/10902en_ZA
dc.identifier.chicagocitationRice, Edward. <i>"Rory lines : silver lining for seabirds in South Africa's demersal trawl fisheries."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2012. http://hdl.handle.net/11427/10902en_ZA
dc.identifier.citationRice, E. 2012. Rory lines : silver lining for seabirds in South Africa's demersal trawl fisheries. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Rice, Edward AB - Seabird bycatch in commercial fisheries is one of the major factors causing decreases in many seabird populations. In trawl fisheries, high mortalities have been recorded as a result of seabirds being struck by trawl warps (the cables used to tow the trawl net). Tori (bird-scaring) lines have been used to decrease seabird mortality in some trawl fisheries by up to 90%. However, tori lines are not effective at reducing the number of birds that drift towards the trawl warps while feeding on factory discards alongside the vessel. The Albatross Task Force (ATF) helped to develop and test a new device, the Rory Line (RL), to be used in conjunction with tori lines, and designed to reduce warp strikes by placing a physical barrier between the scupper (where factory discards are released) and the danger zone (where the trawl warps enter the water) at the stern of the vessel. This study tests the efficacy of the RL at reducing the number of birds drifting into the danger zone and the number of birds being struck by the trawl warps. DA - 2012 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2012 T1 - Rory lines : silver lining for seabirds in South Africa's demersal trawl fisheries TI - Rory lines : silver lining for seabirds in South Africa's demersal trawl fisheries UR - http://hdl.handle.net/11427/10902 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/10902
dc.identifier.vancouvercitationRice E. Rory lines : silver lining for seabirds in South Africa's demersal trawl fisheries. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2012 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/10902en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Biological Sciencesen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherConservation Biologyen_ZA
dc.titleRory lines : silver lining for seabirds in South Africa's demersal trawl fisheriesen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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