The corrupted shark was an unlockable item in the Grid Master community event, rewarded after the player cooks a shark while wearing a chef's hat.
The corrupted shark is not consumed when eaten and heals 20 hitpoints, which can be increased further if the player has tier 2 combat masteries and/or is wearing sunlit bracers. Eating the corrupted shark gives the message You bite a chunk out of the corrupted shark, but it quickly regrows..
Like normal food, it can be turned into rotten food by ghasts. If lost, it can be reclaimed from the Sage.
Unlike any other food, it is not prevented from being eaten while using the On a Diet invocation in the Tombs of Amascut.
Despite being infinitely consumable to the player, the corrupted shark can be fully eaten by cats and the naughty gull.
Although the shark is a valid food that you can attempt to sell during the Dorgesh-Kaan market trading activity, because the item's value is 0, there is no price that the Gourmets will accept for it, as they consider 1 coin to be too high, and 0 coins to be too low.