Minecraft wiki entry for Guardian, associated text: When killed by the player Guardians have a 2.5% chance of dropping a random fish as an extra drop in addition to the normal fish drop. This chance is increased by 1% per Looting level, for a maximum of 5.5% with Looting III. This drop uses the same chances that fishing uses, resulting in a 60% chance for raw cod, a 25% chance for raw salmon, a 13% chance for pufferfish, and a 2% chance for tropical fish. A guardian on fire drops cooked fish.