Which fish group has a skeleton made of bone and a swim bladder for buoyancy?

Which fish group has a skeleton made of bone and a swim bladder for buoyancy?

• A. Open Jawed Mouth for Feeding
• B. Cartilaginous Fish
• C. Bony Fish (Osteichthyes)
• D. Jawless Fishes (Agnatha)

Answer: (C)

Buoyancy control and skeleton type identify bony fishes. The group that has a skeleton made of bone (ossified tissue) and a swim bladder for buoyancy is Osteichthyes, the bony fishes. The swim bladder is a gas-filled organ that lets these fish adjust their overall density to stay at a chosen depth without expending a lot of energy. In contrast, cartilaginous fishes have skeletons made of cartilage rather than bone and typically lack a swim bladder, relying instead on a large oily liver and continuous swimming to maintain buoyancy. Jawless fishes lack jaws and also do not possess a bone-based skeleton or a swim bladder.

Buoyancy control and skeleton type identify bony fishes. The group that has a skeleton made of bone (ossified tissue) and a swim bladder for buoyancy is Osteichthyes, the bony fishes. The swim bladder is a gas-filled organ that lets these fish adjust their overall density to stay at a chosen depth without expending a lot of energy. In contrast, cartilaginous fishes have skeletons made of cartilage rather than bone and typically lack a swim bladder, relying instead on a large oily liver and continuous swimming to maintain buoyancy. Jawless fishes lack jaws and also do not possess a bone-based skeleton or a swim bladder.