Question

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multiple choice question
what type of fish is shown in the image?
hagfish
cartilaginous fish
bony fish
lungfish

Explanation:

• Bony fish (Osteichthyes) have a swim bladder, which is shown in the image. Hagfish (Myxini) are jawless and lack a swim - bladder. Cartilaginous fish (Chondrichthyes) like sharks have a skeleton made of cartilage and no swim bladder (they have a liver rich in oil for buoyancy). Lungfish (Dipnoi) have lungs in addition to gills, but the key feature here is the presence of a swim bladder which is characteristic of bony fish.

Answer:

bony fish