caa a22 4500 606227970 CHVBK 20210128101201.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s10641-014-0368-y doi (NATIONALLICENCE)springer-10.1007/s10641-014-0368-y Diet and condition of Atlantic bluefin tuna ( Thunnus thynnus ) in the Gulf of Maine, 2004-2008 [Elektronische Daten] [John Logan, Walter Golet, Molly Lutcavage] Atlantic herring (Clupea harengus) are the primary forage for Atlantic bluefin tuna (Thunnus thynnus; ABFT) in the Gulf of Maine. Recent studies have documented significant declines in ABFT somatic condition and shifts in their size and spatial distribution in the Gulf of Maine, which may be linked to trophic changes. We collected stomachs (n = 122) as well as liver (n = 110) and white muscle (n = 382) samples for carbon and nitrogen stable isotope analysis and lipid analysis to determine if diet composition had changed relative to the late 1980's to early 2000's for large, commercially harvested ABFT (≥185cm curved fork length (CFL)). Samples of smaller ABFT (<185cm CFL) were also collected (stomachs: n = 21; liver: n = 17; white muscle: n = 19) to compare diet between size classes. Large ABFT diet was similar among current and historic studies, Atlantic herring being the main prey (39.5 to 52.8% weight). Small ABFT fed at a lower trophic position (TP = 3.9) than larger individuals (TP = 4.9) due to higher consumption of sand lance (Ammodytes spp.) and euphausiids (65.6 vs. 4.5% weight). Mean and maximum lipid stores of large ABFT increased from spring through fall, but lean fish were observed in all seasons. In the fall, lean ABFT were lighter with lower nitrogen and higher carbon isotope values than co-occurring ABFT with higher lipid stores. These patterns are consistent with shelf vs. offshore isotope baseline differences in the western North Atlantic and variable arrival and residency patterns for ABFT in the Gulf of Maine. Springer Science+Business Media Dordrecht, 2014 Carbon nationallicence Food web nationallicence Herring nationallicence Lipids nationallicence Nitrogen nationallicence Stable isotopes nationallicence Logan John Massachusetts Division of Marine Fisheries, 1213 Purchase Street, 02740, New Bedford, MA, USA aut Golet Walter Large Pelagics Research Center, Department of Biological Sciences, University of New Hampshire, 03824, Durham, NH, USA aut Lutcavage Molly Large Pelagics Research Center, Department of Biological Sciences, University of New Hampshire, 03824, Durham, NH, USA aut Environmental Biology of Fishes Springer Netherlands 98/5(2015-05-01), 1411-1430 0378-1909 98:5<1411 2015 98 10641 https://doi.org/10.1007/s10641-014-0368-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10641-014-0368-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Logan John Massachusetts Division of Marine Fisheries, 1213 Purchase Street, 02740, New Bedford, MA, USA aut NATIONALLICENCE 700 1- Golet Walter Large Pelagics Research Center, Department of Biological Sciences, University of New Hampshire, 03824, Durham, NH, USA aut NATIONALLICENCE 700 1- Lutcavage Molly Large Pelagics Research Center, Department of Biological Sciences, University of New Hampshire, 03824, Durham, NH, USA aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Springer Netherlands 98/5(2015-05-01), 1411-1430 0378-1909 98:5<1411 2015 98 10641