Data from: Disentangling shared and divergent life histories with age-based eye lens isotope records in a coastal shark

This dataset contains stable isotope values from eye lens laminae, vertebral bands, and muscle tissue of wild Leopard Sharks (Triakis semifasciata) collected from multiple estuaries in Central California between 2020 and 2023. Each record includes individual identifiers, tissue type, collection date, locality, sex, total length, lamina/layer designation, tissue diameter, δ13C, δ15N, C:N ratio, and predicted FTIR absorbance for lens laminae. Eye lens laminae provide a sequential biochemical archive, enabling reconstruction of lifetime diet and habitat use at fine temporal resolution. Vertebral and muscle tissues offer complementary isotopic baselines for comparison and tissue discrimination factor estimation. The dataset structure allows tracking of isotopic variation across ontogeny, among individuals, and between estuarine populations. Potential reuse includes ecological studies of long-lived chondrichthyans, life history reconstructions, trophic ecology analyses, and comparative studies of isotopic incorporation across tissue types. All data were collected under appropriate permits and comply with ethical standards for wildlife research. No sensitive or personally identifiable information is included.