10.1594/PANGAEA.985234Bode, AntonioAntonioBode0000-0002-9535-2548Instituto Español de OceanografíaGarcía-Seoane, RitaRitaGarcía-Seoane0000-0003-3043-2376Instituto Español de OceanografíaViana, Inés GInés GViana0000-0002-3685-5591Instituto Español de OceanografíaCarrera, PabloPabloCarrera0000-0001-8819-6690Instituto Español de OceanografíaRiveiro, IsabelIsabelRiveiroInstituto Español de OceanografíaLamas, Ángel FÁngel FLamasInstituto Español de OceanografíaPANGAEA2025amino acidsCarbonNE AtlanticNitrogenNorth Iberian shelfsmall pelagic fishesstable isotope dataEvent labelDATE/TIMELATITUDELONGITUDESpeciesSample IDSizeWeight, total, wetSexStageδ15N, bulk muscle tissueδ13C, bulk muscle tissueCarbon/Nitrogen, molar ratioδ15N, bulk gut contentδ13C, bulk gut contentAlanine, δ15NGlycine, δ15NThreonine, δ15NSerine, δ15NValine, δ15NLeucine, δ15NIsoleucine, δ15NProline, δ15NAspartamine and Aspartic acid, δ15NMethionine, δ15NGlutamine and Glutamic acid, δ15NPhenylalanine, δ15NLysine, δ15NAlanineGlycineThreonineSerineValineLeucineIsoleucineProlineAspartamine and Aspartic acidMethionineGlutamine and Glutamic acidPhenylalanineLysineMidwater trawlElemental analyser - isotope ratio mass spectrometryGas chromatography - Isotope ratio mass spectrometer (GC-IRMS)PELACUS0302PELACUS0303PELACUS0313PELACUS0314PELACUS0315PELACUS0316PELACUS0317PELACUS0318PELACUS0319PELACUS0321PELACUS0322PELACUS0398PELACUS0399PELACUS0401PELACUS0404PELACUS0405PELACUS0406PELACUS0407PELACUS0408PELACUS0409PELACUS0410PELACUS0411PELACUS0412PELACUS0423PELACUS0424ThalassaMiguel OliverVizconde de Eza1998-03-19T00:00:00/2024-04-16T00:00:00Dataset10.1016/j.pocean.2007.04.00510.1016/j.pocean.2017.08.00510.1038/s41598-021-87767-x17867 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalThis dataset contains the values of natural abundance of stable carbon and nitrogen isotopes in bulk muscle and gut contents, and nitrogen isotopes in muscle amino acids measured in 1801 samples of 10 small pelagic fish species sampled during the PELACUS spring cruises in the northwestern Iberian shelf and in adjacent waters of the southern Bay of Biscay. Length, weight, sex and maturity stage data for each individual analyzed are also provided. Fishes were collected by midwater trawls of ca. 30 m2 pelagic net equipped with a graded-mesh netting (starting with 30 mm and ending with 4 mm). The duration of each trawl was between 25 and 40 min. Different species occurred in the same trawls. Samples of muscle tissue and gut contents were preserved dried (50°C, 48 h) or freeze-dried. No treatments for lipid removal were used prior to carbon analyses. Stable isotope determinations in bulk samples (also carbon and nitrogen contents) were made by isotope-ratio mass spectrometry coupled to an elemental analyzer (Bode et al. 2018). Stable nitrogen isotopes in amino acids were determined by isotope-ratio mass spectrometry couples to a gas chromatograph (Bode et al., 2021).Data was additionally funded by PELACUS (1998-1999) project.-9.5133-1.4401666666666740.4398545.6NE AtlanticAgencia Estatal de Investigaciónhttps://doi.org/10.13039/501100011033MCIN/AEI/10.13039/501100011033 FJC2019-040921-IPostdoctoral research grant Juan de la Cierva-FormaciónAgencia Estatal de Investigaciónhttps://doi.org/10.13039/501100011033MCIN/AEI/10.13039/501100011033 IJC2019-040554-IPostdoctoral research grant Juan de la Cierva-FormaciónAgencia Estatal de Investigaciónhttps://doi.org/10.13039/501100011033PID2020-115620RB-100QLOCKS projectAgencia Estatal de Investigaciónhttps://doi.org/10.13039/501100011033PID2023-147149NB-100MTL-FISHFifth Framework Programmehttps://doi.org/10.13039/100011104QLRT-2001-00818SARDYN (2002-2005)Horizon Europehttps://doi.org/10.13039/100018693101150001A new approach to deciphering inshore-offshore connectivity of pelagic food websInstituto Español de Oceanografíahttps://doi.org/10.13039/501100011034ECOPELECOPEL (2006-2008)Sixth Framework Programme of the European Commissionhttps://doi.org/10.13039/1000111038120-09-9Understanding recruitment processes using coupled biophysical models of the pelagic ecosystem (REPROdUCE)