Lacking a bony endoskeleton, sharks, rays, and ratfish belong to what group of fish?
freshwater fish
invertebrates
crustaceans
cartilaginous
Cartilaginous Fish Cartilaginous fish include sharks, rays, and ratfish. Their endoskeleton is made of cartilage instead of bone. They also lack a swim bladder. However, they have a complete vertebral column and jaws. They also have a relatively big brain. shark.