Silver hatchetfish (Gasteropelecus levis)

The abdomen is protruding and shaped like an axe. The pectoral fins are large, like wings, and are commonly known as swallows. No bright colors. It has a docile personality, likes to swim in groups, likes to move in the upper layers of the water, and has strong jumping ability. It is the only fish that can fly. It can jump out of the water and fly several meters to avoid predators. Unlike the gliding of flying fish, they move their pectoral fins rapidly like a hummingbird when flying.

Sprinkle swallows are gregarious fish and it is recommended to keep more than 5 fish.