Data published in: Wheeler CR, Irschick DJ, Mandelman JW, Rummer JL (2023) Non-lethal assessment of elasmobranch ontogenetic shifts in energetics. Journal of Fish Biology. File descriptions: Condition.csv: File including the study, shark ID, location of shark at the time of sampling, date, water temp (C), sex, life history and reproductive status, posterior pectoral girth, anterior pelvic girth, anterior first dorsal girth, anterior second dorsal girth, length (cm), and mass (g). Length_mass_model_data.csv: File including the study, shark ID, location of the shark at the time of sampling, date, water temp (C), sex, life history stage, length (cm), and mass (g).