Do all fish have a skeleton made of bone or cartilage?
No, not all fish have a skeleton made of bone or cartilage. There are three main types of fish skeletons:
- Cartilaginous fish have skeletons made of cartilage, a flexible, rubbery tissue. Examples of cartilaginous fish include sharks, rays, and skates.
- Bony fish have skeletons made of bone, a hard, mineralized tissue. Examples of bony fish include salmon, trout, and tuna.
- Jawless fish have no skeletons at all. Examples of jawless fish include lampreys and hagfish.
The type of skeleton a fish has depends on its evolutionary history. Cartilaginous fish are the oldest group of fish, and their skeletons have remained largely unchanged for millions of years. Bony fish are a more recent group, and their skeletons have evolved to be stronger and more lightweight. Jawless fish are the most primitive group of fish, and their lack of a skeleton is thought to be a holdover from their early evolution.
Related Questions:
- What is the main difference between a cartilaginous fish and a bony fish?
- Which type of fish skeleton is the strongest?
- Which type of fish skeleton is the most flexible?
- Do all fish have jaws?
- What is the most primitive group of fish?
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