ancestral coelacanths

Do Coelacanths Have A Swim Bladder? Do coelacanths have a swim bladder? In most fish, the swim bladder is filled with air, but in the coelacanth, it is packed with oil and fat. Both types of bladder have a similar purpose, however—to increase buoyancy. How do coelacanths swim? While swimming, the coelacanth moves its fins