Epinephelus tukula

The potato cod is after the Queensland grouper the largest species of grouper likely to be encountered in apnea in Indonesia, since it can reach the hundred kilograms.

Underwater, it cannot be confused with any other so its color is specific: This grouper is light gray, or white, covered with large dark patches shaped like potatoes. Once dead, its color becomes a more or less uniform brown.

It can be encountered rather in rocky/ coral bottoms and it likes to seek protection in caves.

In Indonesia it is rather infrequent, I have only seen it once in Lombok, roving at the base of a huge pinnacle.

Given the iconic nature of this fish and its rarity I can only recommend not to disturb it.