This data set contains the density of the painted comber predator Serranus scriba at two CO2 sites (Ambient and High CO2). The density of the predator was visually assessed in replicate 10 × 2 m belt transects at 1–3 m depth on mixed sandy/rocky bottoms in the two CO2 condition sites (ambient, n = 19; high-CO2, n = 22).
Support was provided by the Japan Society for the Promotion of Science (日本学術振興会) as core-to-core funding (Advanced Research Network, https://www.jsps.go.jp/english/e-c2c/adopted_a.html) for 2021-2026.