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Journal of BirdLife Australia
RESEARCH ARTICLE

Seabird mortality associated with Patagonian Toothfish (Dissostichus eleginoides) longliners in Falkland Islands waters

T. A. Reid A D , B. J. Sullivan A , J. Pompert B , J. W. Enticott C and A. D. Black A B
+ Author Affiliations
- Author Affiliations

A Falklands Conservation Seabirds at Sea Team, Jetty Centre, Stanley, Falkland Islands.

B Falkland Islands Fisheries Department, Stanley, Falkland Islands.

C Consolidated Fisheries Limited, Stanley, Falkland Islands.

D Corresponding author. Email: fc.seabirds@horizon.co.fk

Emu 104(4) 317-325 https://doi.org/10.1071/MU03002
Submitted: 2 January 2003  Accepted: 30 March 2004   Published: 23 December 2004

Abstract

Seabird mortality in longline fishing has been implicated in the decline of many populations around the world. The population of the Black-browed Albatross breeding in the Falkland Islands has been estimated to have declined by 87 500 pairs between 1995 and 2000. The observed mortality in the Patagonian Toothfish longline fishery in Falkland Islands waters in 2001–02 was 29 seabirds, including 27 Black-browed Albatrosses, giving an estimated total mortality of 134 (95% confidence limits 80–188) birds, including 126 (75–177) Black-browed Albatrosses. This suggests that this fishery in Falkland Islands waters is currently not contributing substantially to observed declines in the local populations. Nevertheless, mortality could be further reduced by night setting and an increase in line weighting, especially during the breeding season of the Black-browed Albatross.


Acknowledgments

SAST was funded by the Falkland Islands Government, and we appreciate their continued support. The support and assistance of Grant Munro, CFL staff and crew of the Lyn, In Sung 66, Valiant and Pioneer was vital. The support of the FIFD and Fishery Patrol Officers, the crews of the Fishery Patrol Vessels Dorada and Sigma, as well as Byron Marine for Fishery Patrol Vessel transfers was critical. The at-sea data collection of FIFD observers David Tierney, Ross James and David Smith was instrumental. Thanks also to Nic Huin and Becky Ingham (FC) for constant help to SAST throughout the project. The Marine Resource Assessment Group (UK) provided SAST with a blank copy of the longline database used in the CCAMLR waters.


References

Agnew, D. J. , Black, A. D. , Croxall, J. P. , and Parkes, G. B. (2000). Experimental evaluation of the effectiveness of weighting regimes in reducing seabird by-catch in the longline toothfish fishery around South Georgia. CCAMLR Science 7, 119–131.
Brothers N. (1995). An investigation into the causes of seabird mortality and solutions to this in the Spanish system of demersal longline fishing for Patagonian Toothfish Dissostichus eleginoides in the South Atlantic Ocean. Parks and Wildlife Service, Hobart, Tasmania.

Brothers N. (1996). Longline fishing dollars and sense: catching fish not birds using bottom set or mid-water set longlines. Parks and Wildlife Service, Hobart, Tasmania.

Brothers N., Gales R., and Reid T. (1998). Seabird interactions with longline fishing in the AFZ: 1996 seabird mortality estimates and 1988–1996 trends. Wildlife Report 98/1, Parks and Wildlife Service, Hobart.

Brothers, N. , Gales, R. , and Reid, T. (1999). The influence of environmental variables and mitigation measures on seabird catch rates in the Japanese tuna longline fishery within the Australian Fishing Zone 1991–1995. Biological Conservation 88, 85–101.
Crossref | GoogleScholarGoogle Scholar | CCAMLR (2003). Report of the 22nd Meeting of the Scientific Committee. CCAMLR, Hobart.

Cherel, Y. , Weimerskirch, H. , and Duhamel, G. (1996). Interactions between longline vessels and seabirds in Kerguelen waters and a method to reduce seabird mortality. Biological Conservation 75, 63–70.
Crossref | GoogleScholarGoogle Scholar | Cochran W. G. (1977). ‘Sampling Techniques.’ 3rd Edn. (John Wiley and Sons: New York.)

Croxall, J. P. , and Wood, A. G. (2002). The importance of the Patagonian Shelf to top predator species breeding at South Georgia.  Aquatic Conservation: Marine and Freshwater Ecosystems 12, 101–118.
Crossref | GoogleScholarGoogle Scholar | Croxall J. P., McInnes N., and Prince P. A. (1984). The status and conservation of seabirds at the Falkland Islands. In ‘Status and Conservation of the World’s Seabirds’. (Eds J. P. Croxall, P. G. H. Evans and R. W. Schreiber.) pp. 271–291. ICBP Technical Publication No. 2. (ICBP: Cambridge.)

Croxall, J. P. , Rothery, P. , Pickering, S. P. C. , and Prince, P. A. (1990). Reproductive performance and recruitment and survival of Wandering Albatrosses Diomedea exulans at Bird Island, South Georgia. Journal of Animal Ecology 59, 775–796.
Food and Agriculture Organization (1999). The incidental catch of seabirds by longline fisheries: worldwide review and technical guidelines for mitigation. FAO Fisheries Circular No.937. Food and Agriculture Organization of the United Nations, Rome.

Gales R. (1998). Albatross populations: status and threats. In ‘Albatross Biology and Conservation’. (Eds G. Robertson and R. Gales.) pp. 20–45. (Surrey Beatty: Sydney.)

Gales, R. , Brothers, N. , and Reid, T. (1998). Seabird mortality in the Japanese tuna longline fishery around Australia 1988–1995. Biological Conservation 86, 37–56.
Crossref | GoogleScholarGoogle Scholar | Huin N. (2001). Census of the Black-browed Albatross population of the Falkland Islands. Falklands Conservation, Falkland Islands.

Huin, N. (2002a). Foraging distribution of the Black-browed Albatross Thalassarche melanophris, breeding in the Falkland Islands.  Aquatic Conservation: Marine and Freshwater Ecosystems 12, 89–99.
Crossref | GoogleScholarGoogle Scholar | Huin N. (2002b). Year round use of southern oceans by Black-browed Albatross breeding in Falkland Island waters. Falklands Conservation, Falkland Islands.

Klaer N., and Polacheck T. (1995). Japanese longline seabird bycatch in the Australian Fishing Zone April 1991 – March 1994. CSIRO Division of Fisheries Report, Hobart.

Klaer, N. , and Polacheck, T. (1997). By-catch of albatrosses and other seabirds by Japanese longline fishing vessels in the Australian Fishing Zone from April 1992 to March 1995. Emu 97, 150–167.
Marchant S., and Higgins P. J. (1990). ‘Handbook of Australian, New Zealand and Antarctic Birds. Volume 1. Part A.’ (Royal Australian Ornithological Union & Oxford University Press: Melbourne.)

Melvin E. F. (2003). Streamer lines to reduce seabird bycatch in longline fisheries. Washington Sea Grant Program WSG-AS 00-33.

Moreno, C. A. , Rubilar, P. S. , Marschoff, E. , and Benzaquen, L. (1996). Factors affecting the incidental mortality of seabirds in the Dissostichus eleginoides fishery in the southwest Atlantic (subarea 48.3, 1995 season). CCAMLR Science 3, 79–91.
Olmos F., Bastos G. C. C., and Neves T. D. (2000). Estimating seabird bycatch in Brazil. In ‘Second International Conference on the Biology and Conservation of Albatrosses and Petrels, May 2000, Honolulu, Hawaii’.

Prince, P. A. , and Rodwell, S. P. (1994). Ageing immature Black-browed and Grey-headed Albatrosses using moult, bill and plumage characteristics. Emu 94, 246–254.
Schiavini A., Frere E., Gandini P., Garcia N., and Crespo E. (1998). Albatross–fisheries interactions in Patagonian shelf waters. In ‘Albatross Biology and Conservation’. (Eds G. Robertson and R. Gales.) pp. 208–213. (Surrey Beatty: Sydney.)

Seber G. A. F. (1973). ‘The Estimation of Animal Abundance.’ (Griffin: London.)

Stagi A., Vaz-Ferreira R., Marin Y., and Joseph L. (1998). The conservation of albatrosses in Uruguayan waters. In ‘Albatross Biology and Conservation’. (Eds G. Robertson and R. Gales.) pp. 220–224. (Surrey Beatty: Sydney.)

Weimerskirch, H. , Catard, A. , Prince, P. A. , Cherel, Y. , and Croxall, J. P. (1999). Foraging White-chinned Petrels Procellaria aequinoctalis at risk: from the tropics to Antarctica. Biological Conservation 87, 273–275.
Crossref | GoogleScholarGoogle Scholar | White R. W., Reid J. B., Black A. D., and Gillon K. (2002). ‘The Distribution of Seabirds and Marine Mammals in Falkland Island Waters.’ (Joint Nature Conservation Committee: Peterborough, UK.)

Woods R., and Woods A. (1997). ‘Atlas of Breeding Birds of the Falkland Islands.’ (Anthony Nelson: England.)