What is the size of a lionfish?

The size of a lionfish varies depending on the species, with the largest species being the red lionfish (_Pterois volitans_), which can reach a maximum length of around 47 centimetres. However, the average size of most lionfish species is between 20-30 centimetres. Lionfish have a slender, elongated body with large pectoral and pelvic fins, which give them a distinctive appearance.