The bluespotted cornetfish is characterized by an extremely elongated, slender, and tubular body, giving it a distinctive appearance among Mediterranean fishes. Adults typically display bluish or greenish colouration, sometimes with small blue spots along the body. The species has a very long and narrow snout, which it uses to capture small fish and crustaceans. Its elongated body shape allows it to camouflage effectively among seagrass, particularly within Posidonia Oceanica meadows, where it can remain concealed while hunting.

Fistularia commersonii represents one of the fastest documented expansions of an alien fish species in the Mediterranean Sea following its entry through the Suez Canal. Native to the Indo-Pacific and Red Sea, the first confirmed Mediterranean records appeared around 2000–2001 along the eastern Mediterranean coasts, particularly in Israel and Lebanon. From there, the species spread rapidly westward, establishing populations in Greece, Turkey, and Cyprus, before reaching the central Mediterranean, including Malta. This pattern of expansion is characteristic of Lessepsian migration, where species from the Red Sea enter the Mediterranean via the Suez Canal and progressively colonize new habitats.