Through sound vibrations reverberating through the bones of their skullC. Through their gillsD. Through their finsB. Through sound vibrations reverberating through the bones of their skullTBD: Fish hear without the aid of external ears. Sound vibrations reverberate through the bones of the skull to an internal ear. Fish also possess unique sensory organs called lateral lines. These canals along the sides of the fish can sense vibrations and, in some species, weak electrical fields. 4. What do you call a baby fish?A. A guppyB. A fryC.