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dc.contributor.authorBetancor, M.B.
dc.contributor.authorOrtega-García, A. (Aurelio) 
dc.contributor.authorde-la-Gándara, F. (Fernando) 
dc.contributor.authorTocher, D.R.
dc.contributor.authorMourente, G.
dc.date.accessioned2020-06-22T15:46:33Z
dc.date.available2020-06-22T15:46:33Z
dc.date.issued2018
dc.identifier.issn0920-1742
dc.identifier.urihttp://hdl.handle.net/10508/11440
dc.description.abstractThe development of formulated diets and feeds is essential to increase production of farmed tuna species. There is limited knowledge of this topic, mainly on Pacific Bluefin tuna (Thunnus orientalis) in Japan, whereas no major attempts have been made with Atlantic Bluefin tuna (Thunnus thynnus; ABT). In the present study, two trials were performed using inert formulated diets as on-growing feeds for weaned ABT juvenile in order to establish adequate dietary levels of both lipid and omega-3 long-chain polyunsaturated fatty acids (LC-PUFA). In a first trial, ABT (initial weight = 2.9±0.9g) were fed for 10 days with either a commercial (Magokoro®, MGK) or two experimental feeds with two different lipid levels (15 or 20%) using krill oil (KO) as the single lipid source in order to estimate the suitable lipid content. Fish fed MGK displayed the highest growth, followed by 15KO, with no differences in fish survival. Thus, a lipid content of 15% was considered better than 20% for ABT juveniles. In the second trial, fish (initial weight = 3.3 ± 0.6g) were fed either MGK, 15KO or a feed containing 15% lipid with a combination (1:1, v/v) KO and rapeseed oil (RO) (15KORO). Fish fed 15KO and 15KORO showed the highest growth in terms of weight and fork length (including weight gain and SGR). Increasing dietary lipid level or adding RO to the feeds did not increase liver lipid content. The liver fatty acid profile largely reflected dietary intake confirming very limited LC-PUFA biosynthetic activity for this teleost species. In this respect, liver of fish fed 15KO and 20KO displayed the highest contents of docosahexaenoic acid (DHA). The hepatic expression of genes of lipid and fatty acid metabolism, transcription factors, and antioxidant enzymes was investigated with many of the genes showing regulation by both dietary lipid and LC-PUFA contents. The present study showed promising results that suggested ABT juveniles can be on grown on inert dry feeds that supported good fish growth and the accumulation of the health-promoting fatty acid DHA. Further studies are required in order to fully elucidate lipid and fatty acid requirements of this iconic species regarding dietary sources and production costs.es_ES
dc.language.isoenges_ES
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/*
dc.subjectatún rojoes_ES
dc.subjectbluefin tunaes_ES
dc.subjectThunnus thynnuses_ES
dc.subjectnutritiones_ES
dc.subjectlarval rearinges_ES
dc.subjectdietary lipid contentes_ES
dc.subjectdietary lipid sourcees_ES
dc.subjecthepatic lipid metabolismes_ES
dc.subjectgene expressiones_ES
dc.titlePerformance, feed utilization, and hepatic metabolic response of weaned juvenile Atlantic bluefin tuna (Thunnus thynnus L.): effects of dietary lipid level and sourcees_ES
dc.typearticlees_ES
dc.identifier.bibliographicCitationFish Physiology and Biochemistry, 2. 2018: 1-22*
dc.description.versionEn prensaes_ES
dc.publisher.centreCentro Oceanográfico de Murciaes_ES
dc.relation.projectIDNUTRITUNA AGL2014-52003- C2-1-Res_ES
dc.rights.accessRightsopenAccesses_ES
dc.description.impact1,528*
dc.identifier.doi10.1007/s10695-018-0587-9
dc.subject.asfafish es_ES
dc.subject.asfaomega es_ES
dc.subject.asfapolyunsaturated fatty acids es_ES
dc.subject.asfaoil es_ES
dc.subject.asfacollisions es_ES


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    Atribución-NoComercial-SinDerivadas 3.0 España
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