Best practice seabird bycatch mitigation for pelagic longline fisheries targeting tuna and related species

Melvin, Edward F.; Guy, Troy J.; Read, Lorraine B.

doi:10.1016/j.fishres.2013.07.012

Cited by 66 publications

(55 citation statements)

References 42 publications

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“…discarded by fisheries, although this behaviour renders them susceptible to by-catch mortality in fisheries (e.g. Melvin et al 2014), and by reducing their breeding effort (Grémillet et al 2008;Bijleveld and Mullers 2009;Mullers and Tinbergen 2009;Moseley et al 2012; Figure 3). By contrast, a lesser mobility and less adaptable diet of African Penguins and Cape Cormorants rendered them susceptible to a reduced local availability of prey (e.g.…”

Section: Discussionmentioning

confidence: 99%

Winners and losers – responses to recent environmental change by South African seabirds that compete with purse-seine fisheries for food

Crawford

Makhado

Waller³

et al. 2014

Ostrich

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2014) Winners and losers -responses to recent environmental change by South African seabirds that compete with purse-seine fisheries for food, There were recent changes in the distributions of the main prey of four seabirds off South Africa, with sardine Sardinops sagax and anchovy Engraulis encrasicolus shifting from South Africa's north-west coast towards the south-east. This contributed to numbers of African Penguins Spheniscus demersus and Cape Cormorants Phalacrocorax capensis breeding in South Africa decreasing by more than 50%. By contrast, numbers of Cape Gannets Morus capensis and Swift (Crested) Terns Thalasseus bergii increased. The success of the gannet and the tern in the face of recent change is attributable to a rapid increase in South Africa's eastern colony of gannets, aided by high survival of adult birds and perhaps by immigration of first-time breeders from decreasing western colonies, and a probable high production of Swift Terns. The gannet has an extensive foraging range and the tern is nomadic between breeding localities, which gives these species greater flexibility than the other two to adapt to large changes in the distributions of their prey. Additionally, the gannet is able to supplement its diet with fishery discards. A lesser mobility of the African Penguin and the Cape Cormorant rendered them susceptible to a reduced local availability of prey and both species suffered high adult mortality in the last decade.

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Section: Discussionmentioning

confidence: 99%

Winners and losers – responses to recent environmental change by South African seabirds that compete with purse-seine fisheries for food

Crawford

Makhado

Waller³

et al. 2014

Ostrich

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“…Current best practice mitigation measures for pelagic longline fisheries in the southern Ocean aim to ensure that lines are properly weighted, setting only occurs at night and that bird-scaring lines are used during line setting (Melvin et al 2014). Lines should sink to a depth of 5 m while under the protection of bird-scaring lines (Melvin et al 2014).…”

Section: Discussionmentioning

confidence: 99%

“…Lines should sink to a depth of 5 m while under the protection of bird-scaring lines (Melvin et al 2014). This 5 m threshold was based on the maximum diving depth of white-chinned petrels (Melvin et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Diving behaviour of white-chinned petrels and its relevance for mitigating longline bycatch

2014

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The white-chinned petrel (Procellaria aequinoctialis) is the seabird species most commonly killed by Southern Hemisphere longline fisheries. Despite the importance of diving ability for mitigating longline bycatch, little is known of this species' diving behaviour. We obtained data from temperature-depth recorders from nine white-chinned petrels breeding on Marion Island, southwestern Indian Ocean, during the late incubation and chickrearing period. Maximum dive depth (16 m) was slightly deeper than the previous estimate (13 m), but varied considerably among individuals (range 2-16 m). Males dived deeper than females, and birds feeding chicks dived deeper than incubating birds, but dive rate did not differ between the sexes. Time of day had no significant effect on dive depth or rate. Our findings will help to improve the design and performance of mitigation measures aimed at reducing seabird bycatch in longline fisheries, such as the calculation of minimum line sink rates and optimum aerial coverage of bird-scaring lines.

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“…Given their importance for some of the threatened seabirds mentioned above, and also for species breeding at other colonies (Jiménez et al 2014;Tuck et al 2011), 352 improvements in monitoring of bycatch rates and enforcement of compliance with bycatch mitigation requirements by fisheries in these areas would be highly beneficial. Therefore, our 354 results reinforce the need for ICCAT to strengthen and enforce regulations to reduce bycatch and to develop appropriate levels of surveillance of fishery practices by independent 356 observers in both national and international waters, in particular within the Brazilian, Namibian and South African EEZs (Melvin et al 2014;Phillips 2013;Small et al 2015).…”

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confidence: 51%

Using globally threatened pelagic birds to identify priority sites for marine conservation in the South Atlantic Ocean

Dias

Oppel

Bond

et al. 2017

Biological Conservation

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The Convention on Biological Diversity aspires to designate 10% of the global oceans as 24Marine Protected Areas (MPAs), but so far few MPAs protect pelagic species in the high seas. Transparent scientific approaches are needed to ensure that these encompass areas with 26 high biodiversity value. Here we used the distribution of all globally threatened seabirds breeding in a centrally located archipelago (Tristan da Cunha) to provide guidance on where 28MPAs could be established in the South Atlantic Ocean. We combined year-round tracking data from six species, and used the systematic conservation-planning tool Zonation to America. There was no overlap between the identified areas and any of the existing MPAs in the South Atlantic. The conservation of these highly mobile pelagic species cannot be 36 achieved by single countries, but requires a multi-national approach at an ocean-basin scale. 38

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Best practice seabird bycatch mitigation for pelagic longline fisheries targeting tuna and related species

Cited by 66 publications

References 42 publications

Winners and losers – responses to recent environmental change by South African seabirds that compete with purse-seine fisheries for food

Winners and losers – responses to recent environmental change by South African seabirds that compete with purse-seine fisheries for food

Diving behaviour of white-chinned petrels and its relevance for mitigating longline bycatch

Using globally threatened pelagic birds to identify priority sites for marine conservation in the South Atlantic Ocean

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