Fistularia commersonii is a guess.
Snorkeling in large tidepools.
Snorkeling at Two Step.
Dive site Garden Eel Cove.
The cornetfishes are a small family Fistulariidae of extremely elongated fishes in the order Syngnathiformes. The family consists of just a single genus Fistularia with four species, found worldwide in tropical and subtropical marine environments.