Skipjack Tuna Stable Isotopes

This file summarizes the stable isotope (delC13 and delN15) of 121 skipjack tuna (from 40 to 84 cm fork length, FL) captured northeast of Oʻahu (21.477° N, 157.757° W) between May 20 and September 2 of 2020. The samples were analyzed for carbon and nitrogen bulk stable isotopic composition at the University of Hawaiʻi at Manoa Biogeochemical Stable Isotope facility using a Costech ECS 4010 Elemental Combustion System, with a Zero Blank Autosampler, a ThermoFinnigan MAT Conflo IV, and a ThermoFinnigan DeltaXP.​​ Each sample yielded mass of carbon (mg) and nitrogen (mg), and the isotopic values for δ13C (‰) and δ15N (‰). The δ values were calculated using the following equation: δX = [(Rsample/Rstandard)-1]*1000, where X is 13C and 15N and R is the ratio of heavy isotope to light isotope, for carbon (13C/12C) and nitrogen (15N/14N), respectively.