Carbon and nitrogen stable isotope measurements of gelatinous zooplankton and larval fish in the Northern California Current from March 2022 to August 2023

These data include carbon and nitrogen stable isotope measurements of gelatinous zooplankton and larval fish collected during four research cruises in the Northern California Current from March 2022 to August 2023. Also included are carbon and nitrogen contents, organism counts, sizes and volumes, wet weights, dry weights, and ash-free dry weights. The roles of gelatinous zooplankton and larval fish in marine food webs are not well understood. These data examine the trophic roles of these organisms across two seasons in a highly productive coastal system and contribute to food web modelling efforts.