Gasterosteus aculeatus clutch size, average egg size diameter per clutch, fertilization success, hatching success and maternal size depending on parental heatwave treatment

We measured several fecundity traits for each clutch of fertilized eggs including clutch size (total number of eggs), average egg size (diameter (mm)), fertilization success and hatching success. The diameter (mm) of all eggs in a clutch was measured to estimate average egg size.