Clownfish

Clownfish are food items that are obtained by fishing.

Fishing
The most common way of obtaining clownfish, like any other fish, is fishing. They are rare, as the chance of a catch is 2%. 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 0.05%: 2.5% * 2% (the Guardian's rare drop rate * the chance of a rare drop being a clownfish).

Food
One clownfish restores hunger and 0.2 hunger saturation.

Ocelots
Clownfish can be used to tame ocelots, heal and breed cats, and make baby cats grow up faster by 10% of the remaining time.