Cartilaginous
From The Aquarium Wiki
Cartilaginous fish, the most well known being Sharks, are jawed fish with paired fins, paired nostrils, small scales, two-chambered hearts, and skeletons made of cartilage rather than bone.
Cartilaginous fish, the most well known being Sharks, are jawed fish with paired fins, paired nostrils, small scales, two-chambered hearts, and skeletons made of cartilage rather than bone.