Answer:
At aquarium are usualy Cartilaginous fishes.
Explanation:
Cartilaginous fish have cartilage skeletons, while bonefish have a skeleton that mainly consists of bone.
Bonefish:
- Their endoskeleton is completely bone.
- They have the previous opening of the tip
- They can be freshwater or sea fish
Cartilaginous fish:
- They are predominantly cartilated in their endoskeleton
- Their exoskeleton is placoid (very small denticles coated with lots of sharp enamel)
- The mouth of these fish is located in the middle
