Noun
fishes in which the skeleton may be calcified but not ossified
Source: WordNetIndeed, in many cartilaginous fish, the anterior portion of the kidney may degenerate or cease to function altogether in the adult. Source: Internet
This allows more efficient locomotion among these negatively buoyant cartilaginous fish. Source: Internet
This includes bony fishes ( Osteichthyes ), cartilaginous fish ( Chondrichthyes ), and jawless fish ( Agnatha ). Source: Internet