{"id":13524,"date":"2019-07-29T10:13:02","date_gmt":"2019-07-29T08:13:02","guid":{"rendered":"https:\/\/www.azti.es\/?p=13524"},"modified":"2019-08-29T11:52:44","modified_gmt":"2019-08-29T09:52:44","slug":"industrialised-fishing-overlaps-threatened-shark-hotspots-worldwide","status":"publish","type":"post","link":"https:\/\/old.azti.es\/en\/industrialised-fishing-overlaps-threatened-shark-hotspots-worldwide\/","title":{"rendered":"Industrialised fishing overlaps threatened shark   hotspots worldwide"},"content":{"rendered":"\n<ul><li>Major high seas fishing activities are centred on ecologically important shark hotspots worldwide<\/li><li>North Atlantic blue sharks and shortfin mako \u2013 the fastest shark in the sea \u2013 have on average 76% and 62% of their space use, respectively, overlapped by longlines each month<\/li><li>Even internationally protected species such as great white and porbeagle sharks at risk<\/li><li>Danger of accelerating decline in populations and disappearance of hotspots<\/li><li>Results could provide a \u2018blueprint\u2019 for use in deciding where to place large-scale marine protected areas (MPAs)<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" width=\"1024\" height=\"683\" src=\"https:\/\/www.azti.es\/wp-content\/uploads\/2019\/07\/Tiger-shark_Photo-credit_Neil-Hammerschlag-1024x683.jpg\" alt=\"\" class=\"wp-image-13525\"\/><figcaption>Photo: Neil Hammerschlag<\/figcaption><\/figure>\n\n\n\n<p>Even the remotest parts of the ocean appear to offer highly migratory sharks little refuge from industrialised fishing fleets, a ground-breaking study published in the journal <em>Nature<\/em> reports.<\/p>\n\n\n\n<p>Large sharks inhabiting the open ocean account\nfor over half of all identified shark catch globally in target fisheries or as\nbycatch. Regional declines in abundance of some populations such as shortfin\nmako shark \u2013 the fastest shark in the sea \u2013 have led to widespread calls for\ncatch limits in the High Seas (areas beyond national jurisdiction; ABNJ) where\nthere is currently little or no management for sharks. <\/p>\n\n\n\n<p>But precisely where in the vast expanse of the\noceans sharks aggregate and how much fishing takes place in those chosen\nhabitats remains poorly known globally, even though it will be crucial to\nselecting sites to conserve sharks. <\/p>\n\n\n\n<p>Now, an international team of over 150\nscientists from 26 countries have tackled this knowledge gap by collating movement\ndata from nearly 2,000 sharks tracked with satellite transmitter tags. Researchers\nmapped shark positions and revealed \u2018hotspots\u2019 of space use in unprecedented\ndetail. They found multi-species pelagic shark hotspots were mostly located in\nfrontal zones, boundaries in the sea between different water masses that are\nhighly productive and food-rich.<\/p>\n\n\n\n<p>They then calculated how much the hotspots\nwere overlapped by global fleets of large, longline fishing vessels \u2013 the type\nof fishing gear that catches most pelagic sharks \u2013 with each vessel capable of\ndeploying 100 km long lines bearing 1200 baited hooks on a daily basis. <\/p>\n\n\n\n<p>Strikingly, they found 24% of the mean monthly\nspace used by sharks globally falls under the footprint of pelagic longline\nfisheries. For commercially exploited sharks such as North Atlantic blue and\nshortfin makos sharks overlap was much higher, with on average 76% and 62% of\ntheir space use, respectively, overlapping with longlines each month. Even\ninternationally protected species such as great white and porbeagle sharks had\noverlap values exceeding 50%. <\/p>\n\n\n\n<p>&nbsp;\u201cOur\nresults show major high seas fishing activities are currently centred on\necologically important shark hotspots worldwide\u201d says Professor David Sims, who\nled the study as part of the Global Shark Movement Project based at the Marine\nBiological Association Laboratory in Plymouth, UK.<\/p>\n\n\n\n<p>Equally alarming was that shark hotspots\nshowing high overlap with longline fishing were often also subjected to high\nfishing effort, a potential \u2018double whammy\u2019 for sharks that will result in\nhigher catch rates and potentially accelerate declines in abundance.&nbsp; <\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>\u201cSome shark hotspots were exposed to higher than average fishing effort for as much as half the year\u201d <\/p><cite> <br>said Dr Nuno Queiroz, a lead researcher in the study from the University of Porto in Portugal. <\/cite><\/blockquote>\n\n\n\n<p>Given the high fishing effort in hotspots of\nmany species for significant portions of the year, and the very few tracked\nhotspots free from exploitation, the study reveals exposure risk of sharks to\nfisheries in the high seas is spatially extensive \u2013 stretching across entire\nocean-scale population ranges for some species.<\/p>\n\n\n\n<p>The team\u2019s findings indicate large sharks \u2013\nsome of which are already endangered globally \u2013 face a future with limited\nspatial refuge from industrial longline fishing effort.<\/p>\n\n\n\n<p>The researchers propose that the detailed maps\nof shark hotspots and exposure to longline fishing effort they have produced\ncan provide a \u2018blueprint\u2019 for use in deciding where to place large-scale marine\nprotected areas (MPAs) aimed at conserving sharks, in addition to the need for\nstrict quotas to reduce catches elsewhere. <\/p>\n\n\n\n<p>\u201cSome of the shark hotspots we studied may not\nbe there in as little as a few years\u2019 time if management measures are not put\nin place now to conserve the sharks and the habitats on which they depend\u201d Sims\nsays.<\/p>\n\n\n\n<p><em>The research is published online in Nature on 24<\/em><sup><em>th<\/em><\/sup><em> July 2019.<\/em> <\/p>\n\n\n\n<p>Authors:  Queiroz, N., Humphries, N.E., Couto, A., Vedor, M., da Costa, I., Sequeira, A.M.M., Mucientes, G., Santos, A.M., Abascal, F.J., Abercrombie, D.L., Abrantes, K., Acu\u00f1a-Marrero, D., Afonso, A.S., Afonso, P., Anders, D., Araujo, G., Arauz, R., Bach, P., Barnett, A., Bernal, D., Berumen, M.L., Bessudo Lion, S.,&nbsp; Bezerra, N.P.A., Blaison, A.V., Block, B.A., Bond, M.E., Bradford, R.W., Braun, C.D., Brooks, E.J., Brooks, A., Brown, J., Bruce, B.D., Byrne, M.E., Campana, S.E., Carlisle, A.B., Chapman, D.D., Chapple, T.K., Chisholm, J., Clarke, C.R., Clua, E.G., Cochran, J.E.M., Crochelet, E.C., Dagorn, L., Daly, R., Devia Cort\u00e9s, D., Doyle, T.K., Drew, M., Duffy, C.A.J., Erikson, T., Espinoza, E., Ferreira, L.C., Ferretti, F., Filmalter, J.D., Fischer, C.G., Fitzpatrick, R., Fontes, J., Forget, F., Fowler, M., Francis, M.P., Gallagher, A.J., Gennari, E., Goldsworthy, S.D., Gollock, M.J., Green, J.R., Gustafson, J.A., Guttridge, T.L., Guzman, H.M., Hammerschlag, N., Harman, L., Hazin, F.H.V., Heard, M., Hearn, A.R., Holdsworth, J.C., Holmes, B.J., Howey, L.A., Hoyos, M., Hueter, R.E., Hussey, N.E., Huveneers, C., Irion, D.T., Jacoby, D.M.P., Jewell, O.J.D., Johnson, R., Jordan, L.K.B., Jorgensen, S.J., Joyce, W., Keating Daly, C.A., Ketchum, J.T., Klimley, A.P., Kock, A.A., Koen, P., Ladino, F., Lana, F.O., Lea, J.S.E., Llewellyn, F.,&nbsp; Lyon, W.S., MacDonnell, A., Macena, B.C.L., Marshall, H., McAllister, J.D., McAuley, R., Me\u00ffer, M.A., Morris, J.J., Nelson, E.R., Papastamatiou, Y.P., Patterson, T.A., Pe\u00f1aherrera-Palma, C., Pepperell, J.G., Pierce, S.J., Poisson, F., Quintero, L.M., Richardson, A., Rogers, P.J., Rohner, C.A., Rowat, D.R.L., Samoilys, M., Semmens, J.M., Sheaves, M., Shillinger, G., Shivji, M., Singh, S., Skomal, G.B., Smale, M.J., Snyders, L.B., Soler, G., Soria, M., Stehfest, K.M., Stevens, J.D., Thorrold, S.R., Tolotti, M.T.,&nbsp; Towner, A., Travassos, P, Tyminski, J.P., Vandeperre, F., Vaudo, J.J., Watanabe, Y.Y., Weber, S.B., Wetherbee, B.M., White, T.D., Williams, S., Z\u00e1rate, P.M., Harcourt, R., Hays, G.C., Meekan, M.G., Thums, M., Irigoien, X., Eguiluz, V.M., Duarte, C.M., Sousa, L.L., Simpson, S.J., Southall, E.J. &amp; Sims.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Major high seas fishing activities are centred on ecologically important shark hotspots worldwide North Atlantic blue sharks and shortfin mako \u2013 the fastest shark in the sea \u2013 have on [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":13525,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":[],"_tribe_ticket_has_attendee_info_fields":false},"categories":[3],"tags":[],"tax-big-challenge":[36],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.4.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Industrialised fishing overlaps threatened shark  hotspots worldwide - AZTI<\/title>\n<meta name=\"robots\" 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