Clownfish

Clownfish are food items that are obtained by fishing. One clownfish restores hunger and 0.2 hunger saturation. Clownfish cannot be cooked. Its only uses are for food and taming ocelots, but are inefficient compared to other fish in terms of food. They are also rare, as the chance of a catch is 2%.

Fishing
The most common way of obtaining clownfish, like any other fish, is fishing. The chance of one being caught can be increased with the 'Lure' enchantment.

Guardians
Another method of obtaining them is through defeating Guardians. This method is very inefficient, as the drop rate is roughly 0.05% (2.5 * 0.02).