bandfishPronunciation: /ˈbandfɪʃ/Definition of bandfish noun (plural same or bandfishes) 1an elongated marine fish with dorsal and often anal fins that extend the length of the body. Family Cepolidae: several genera and species 2a large edible freshwater fish that has a long trunk-like snout and lacks dorsal, pelvic, and tail fins, native to tropical South America. Rhamphichthys rostratus, family Rhamphichthyidae