Fish-Anemone association recorded at ambient (∼380 μatm) and high (∼850 μatm) CO2 sites off a volcanic CO2 vent in Vulcano island, Italy

Density of Gobius incognitus and Anemonia viridis quantified by scuba diving in replicated belt transects (3m long and 1m wide) positioned at 1–2 m depth on mixed sandy/rocky substrates at the ambient (∼380 μatm) and high (∼850 μatm) CO2 sites. Fish/anemone association was also recorded in the two sites under different CO2 conditions (Ambient and High CO2).