Spence-Jones, Helen; Shama, Lisa N S (2025): Gasterosteus aculeatus egg size diameter and area of all eggs in a clutch, as well as clutch size depending on parental heatwave treatment [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.973497, In: Spence-Jones, H; Shama, LNS (2025): Stickleback (Gasterosteus aculeatus) marine heatwave experiment: F0 adult size and fecundity traits, F1 offspring growth, behavior and survival, and F2 offspring egg size, clutch size, and hatchling length [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.973487