Gasteropelecidae

The Gasteropelecidae family, commonly known as freshwater hatchetfishes or flying characins, are small South American fish related to characins. These fish, typically measuring 3 to 10 cm (1.2 to 4 inches), are known for their ability to "fly" or glide short distances over water by rapidly flapping their large pectoral fins. They are often found near the water's surface, where they hunt insects. Some species, like the marbled hatchetfish (Carnegiella strigata) and the silver hatchetfish (Gasteropelecus sternicula), are popular in home aquariums.12