Here's why they are different:
* Skeleton: Prawns have an exoskeleton, a hard outer shell that protects them. Fish have internal skeletons made of bone.
* Breathing: Prawns breathe through gills, but they are located on their legs instead of in their head like fish.
* Reproduction: Prawns lay eggs, while fish typically reproduce through spawning, releasing eggs and sperm into the water.
* Body shape: Prawns have segmented bodies with multiple legs, while fish have streamlined bodies with fins.
So, while prawns are often found in the same environment as fish, they are distinct and fascinating creatures in their own right.