Observed density (# per 120 m2) and frequency of occurrence of large reef-associated predators on artificial versus natural reefs per 120 m2 transect.

For each species, raw abundance over 109 transects of artificial reefs and 127 transects on natural reefs is provided, along with the frequency of occurrence (%) that corrects for differing number of transects by reef type. Mean observed density ± SE is provided. Sphyraena sp. represents pooled values of two species, barracuda (Sphyraena barracuda) and guachanche (Sphyraena guanchancho).