Dataset: CTD summary and prey size data for five mucous mesh grazer species collected during R/V Sikuliaq Cruise SKQ202204S and R/V Marcus G. Langseth Cruise MGL2207 in the Northern California Current in Mar and Jul 2022

We sampled six cross-shelf transects in the Northern California Current (NCC) along the coasts of Oregon and Washington, USA from March 2-11, 2022 (Winter = W22) and July 20-28, 2022 (Summer = S22) on cruises SKQ202204S and MGL2207. Pelagic tunicates and pteropods were collected using a 4 m^2 Multiple Opening/Closing Net and Environmental Sensing System (MOCNESS, 1 mm mesh) at each station from depths ranging 0 to 100 m. All sampled mucous mesh grazers were from shelf-break or off-shelf sampling stations, and were processed immediately to reduce gut contents being digested or expelled. Animals and/or dissected guts were rinsed in deionized water (DI) to remove salt and preserved at -20 ˚C or in 0.125% TEM-grade glutaraldehyde at +4 ˚C until further processing.