**3. Results**

A total of 8137 individual fish belonging to 68 species and 22 families were recorded across the sites on Serranilla. The families represented by the most species were: Scaridae (12 spp), Pomacentridae (9 spp), and Labridae (7 spp). Three wrasses (Labridae) were the most abundant species, representing 50% of the total fish abundance: *Halichoeres bivittatus*, *H. garnoti,* and *Thalassoma bifasciatum*. However, because of the larger sizes of individuals, the highest mean biomasses were represented by *Haemulon album*, *Melichthys niger,* and *Mulloidichthys martinicus*, which together contributed >30% of the total biomass (Table S2).
