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Tunas off northwest Africa: The epipelagic diet of The Bigeye and Skipjack tunas

2021Journal article Open access
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dc.contributor.authorRomero, Joana
dc.contributor.authorCatry, Paulo
dc.contributor.authorHermida, Margarida
dc.contributor.authorNeves, V C
dc.contributor.authorCavaleiro, Bárbara
dc.contributor.authorGouveia, Lídia
dc.contributor.authorGranadeiro, José Pedro
dc.date.accessioned2021-03-20T01:05:40Z
dc.date.available2021-03-20T01:05:40Z
dc.date.issued2021
dc.description.abstractTunas are among the most exploited top predators worldwide, with negative impacts on some of their stocks. Changes in their population abundance can impact marine food-webs and have the potential to alter entire ecosystems. To better understand the impacts of the exploitation of tuna stocks in the most critical habitats, basic knowledge on the diet of these species in each region is required. Here, we describe the diet of the two most fished tuna species in the archipelago of Madeira, the Bigeye tuna Thunnus obesus and the Skipjack tuna Katsuwonus pelamis, based on stomach contents analysis. To gain further insights into the diet, and also better assess the possible bias caused by the occurrence of live bait in stomachs, we compared tuna mercury values with those of two other predators with similar diets that are not directly targeted by fisheries, and with Bigeye and Skipjack tunas from other ocean basins. Bigeye tunas fed mostly on Atlantic chub mackerel Scomber colias and mackerel Trachurus sp., which together contributed with 85% of total prey weight. Only 7.5% of prey weight was constituted by mesopelagic prey, including myctophids and cephalopods. Skipjack tunas had an epipelagic diet (NF = 97%), with the Atlantic chub mackerel representing half of the total prey weight, despite Longspine snipefish Macroramphosus scolopax and Sand smelt Atherina sp. accounting for 62.9% of the total number of prey. There were interannual variations in diet likely linked to interannual pelagic community shifts. Bait did not bias the results of the stomach analysis of these tunas and bait species were observed to be part of the natural diet of both tuna species. Baseline data provided by this study should allow for more informed decisions for an efficient ecosystem-based fisheries management.pt_PT
dc.description.sponsorshipFundação para a Ciência e Tecnologia - FCTpt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationFisheries Research, 238, 1-9 Doi: 10.1016/j.fishres.2021.105914pt_PT
dc.identifier.doi10.1016/j.fishres.2021.105914pt_PT
dc.identifier.issn01657836
dc.identifier.urihttp://hdl.handle.net/10400.12/8044
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherelsevierpt_PT
dc.relationPTDC/MAR-PRO/ 0929/2014pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectThunnus obesuspt_PT
dc.subjectKatsuwonus pelamispt_PT
dc.subjectDietpt_PT
dc.subjectMercurypt_PT
dc.subjectNortheast Atlantic Oceanpt_PT
dc.titleTunas off northwest Africa: The epipelagic diet of The Bigeye and Skipjack tunaspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceNetherlandspt_PT
oaire.citation.endPage9pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleFisheries Researchpt_PT
oaire.citation.volume238pt_PT
person.familyNameRomero
person.familyNameCatry
person.familyNameda Conceição Aragão Hermida
person.familyNameNeves
person.familyNameCavaleiro
person.familyNameGouveia
person.familyNamePedro Granadeiro
person.givenNameJoana
person.givenNamePaulo
person.givenNameMargarida Dulce
person.givenNameVerónica
person.givenNameBárbara
person.givenNameLídia
person.givenNameJosé
person.identifierA-4642-2009
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person.identifier.ciencia-idD51D-A793-94E7
person.identifier.ciencia-id3114-23EB-2E89
person.identifier.orcid0000-0001-8059-1282
person.identifier.orcid0000-0003-3000-0522
person.identifier.orcid0000-0002-0259-109X
person.identifier.orcid0000-0002-6826-4542
person.identifier.orcid0000-0003-3615-1823
person.identifier.orcid0000-0001-9746-8627
person.identifier.orcid0000-0002-7207-3474
person.identifier.ridN-2526-2017
person.identifier.ridI-5408-2013
person.identifier.scopus-author-id7003725276
person.identifier.scopus-author-id6701834265
person.identifier.scopus-author-id6603758245
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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