Why will a shark sink to the bottom if it stops moving its body and fins?
| September 16, 2021 | education
The superclass of fish includes 2 classes:
cartilaginous and bony fish.
Cartilaginous fish are older than bony fish, therefore they have a more primitive structure.
The shark belongs to the class of cartilaginous fish.
They have a cartilaginous skeleton, fins are paired and arranged horizontally, primitive (placoid) scales, and no swim bladder.
It is because of the lack of a swim bladder that the shark must constantly move in order to stay in the water column.
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