A fish is shaped for where it lives and how it feeds. A fish with a torpedo shape can swim quickly through the water. A fish that is flat can easily hide on the bottom of the water. Some fish are shaped like eels. Some fish have long shovel-shaped or paddle-shaped snouts. Other fish such as gar are spear-nosed. Some fish are rounded or disk-shaped.
A fish's mouth shape is adapted to the food it eats. A fish with a mouth that slants upward might attack prey from underneath. A fish with a lower jaw that is flat probably feeds on or near the bottom.
Take a look at these fish: