Mention the differences between cartilaginous and bony fishes.

Explanation

### Step-by-Step Text Solution:

1. **Definition of Cartilaginous and Bony Fishes**:
- Cartilaginous fishes are those that have a skeleton made of cartilage, which is a flexible tissue. Examples include sharks and rays.
- Bony fishes, on the other hand, have a skeleton made of bone, which is a hard and rigid structure. Examples include salmon and goldfish.

2. **Skeleton Composition**:
- **Cartilaginous Fishes**: Their endoskeleton is composed entirely of cartilage.
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