The clownfish is an edible type of Fish added in Update 1.7.
A clownfish cannot be cooked, but is still edible. It restores half a bar of hunger, making it impractical compared to other foods. However, clownfish can be helpful if a player has a whole stack of them, or if they are the only available food source in an emergency.
The clownfish, like any other fish, can be found while Fishing in any body of Water. To help increase the odds of obtaining this fish, fishing rod enchantments (Lure and Luck of the Sea) can be added to a fishing rod.