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Seabird bycatch by tuna longline fisheries off southern Africa, 1998–2000
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: P. G. Ryan D. G. Keith M. KroeseThe incidental mortality of seabirds in tuna longline fisheries is estimated for the continental South African Exclusive Economic Zone (EEZ). Fishery observers accompanied 13 fishing trips and observed 108 sets (143 260 hooks) during the period 1998–2000. Despite most lines... -
Population Dynamics of the Wandering Albatross Diomedea Exulans at Marion Island: Longline Fishing and Environmental Influences
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D. C. Nel F. Taylor P. G. Ryan J. CooperThe subantarctic Prince Edward Islands (Marion and Prince Edward) support the largest breeding population of the Vulnerable wandering albatross Diomedea exulans. The number of birds breeding at Marion Island has fluctuated over the past three decades apparently as a result... -
Spatial description of hake-directed fishing activity off the west coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TP Fairweather AJ Booth WHH Sauer RW LeslieHistorically, the two species of Cape hakes Merluccius capensis and M. paradoxus off South Africa were commercially exploited exclusively by demersal trawling. In 1994, hake-directed demersal longline was introduced on an experimental basis, and in 1998 was initiated as a... -
Turtle bycatch in the pelagic longline fishery off southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SL Petersen MB Honig PG Ryan R Nel LG UnderhillCapture by pelagic longline fisheries has been identified as a key threat to turtle populations. This study is the first assessment of turtle bycatch in the South African pelagic longline fishery for tunas Thunnus spp. and swordfish Xiphias gladius. A... -
Seabird bycatch in the pelagic longline fishery off southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SL Petersen --- , South Africa MB Honig --- , South Africa PG Ryan --- DST/NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, South Africa LG Underhill --- Animal Demography Unit, Department of Zoology, South AfricaThe waters around South Africa provide rich foraging opportunities for pelagic seabirds. They also support a pelagic longline fleet targeting tunas Thunnus spp. and swordfish Xiphias gladius, which set a total of 41.5 million (average 5.2 million per year) and... -
Seabird bycatch in the demersal longline fishery off southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SL Petersen --- , South Africa MB Honig --- , South Africa PG Ryan --- DST/NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, South Africa LG Underhill --- Animal Demography Unit, Department of Zoology, South Africa M Goren --- , South AfricaThis study assesses seabird bycatch in the demersal longline hake (Merluccius capensis and M. paradoxus) fishery in the southern Benguela region. Observers collected seabird bycatch data from 2 412 sets (14 million hooks) in the South African fishery, accounting for... -
Pelagic shark bycatch in the tuna- and swordfish-directed longline fishery off southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SL Petersen --- , South Africa MB Honig --- , South Africa PG Ryan --- DST/NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, South Africa LG Underhill --- Animal Demography Unit, Department of Zoology, South Africa LJV Compagno --- , South AfricaThe capture of pelagic sharks as bycatch of the South African pelagic longline fleet targeting tuna Thunnus spp. and swordfish Xiphias gladius was investigated during the period 1998-2005. In all, 26 species were caught, of which six are listed by... -
Assessing the suitability of commercial fisheries data for local-scale marine spatial planning in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Chalmers --- Department of Ichthyology and Fisheries Science, South Africa A Oosthuizen --- Park Planning and Development, South African National Parks, South Africa A Götz --- Department of Ichthyology and Fisheries Science, South Africa A Paterson --- South African Institute for Aquatic Biodiversity, South Africa WHH Sauer --- Department of Ichthyology and Fisheries Science, South AfricaThis study integrates fisheries logbook data with observer and vessel monitoring system (VMS) data in order to assess the accuracy of reported data and to develop high-resolution spatial data suitable for use in local-scale marine spatial planning analyses. Spatial assessments... -
Rapid fish stock depletion in previously unexploited seamounts: the case of
Beryx splendens from the Sierra Leone Rise (Gulf of Guinea)Item type: Journal Article • Journal: African Journal of Marine Science • Authors: F Salmerón --- Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Málaga, Spain JC Báez --- Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Málaga, Spain D Macías --- Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Málaga, Spain L Fernandez-Peralta --- Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Málaga, Spain A Ramos --- IEO, Centro Oceanográfico de Vigo, Subida a Radio Faro, Vigo (Pontevedra), SpainFish stocks associated with seamounts may be particularly susceptible to overexploitation. From January to July 2001, the Spanish Oceanographic Institute (IEO) conducted an experimental fishing survey entitled ‘Palguinea-2001’ on the seamounts of the Sierra Leone Rise. Beryx splendens (commonly called... -
Patterns and trends in seabird bycatch in the pelagic longline fishery off South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: DP Rollinson --- FitzPatrick Institute of African Ornithology, DST/NRF Centre of Excellence, South Africa RM Wanless --- FitzPatrick Institute of African Ornithology, DST/NRF Centre of Excellence, South Africa PG Ryan --- FitzPatrick Institute of African Ornithology, DST/NRF Centre of Excellence, South AfricaBoth foreign and domestic pelagic longline fishing vessels operate in South Africa’s Exclusive Economic Zone and adjacent international waters where they kill hundreds of seabirds each year as bycatch. To update assessments of the impact of the pelagic longline fishery...