Plaice is a type of flatfish, caught in the waters off the shores of Faranga. It has been commercially important for certain merchants, especially when times became difficult following the arrival of the Inquisition and the lock-down of Harbour Town.
Like a limited number of other consumable items (such as mint, fried herring, and a potion of regeneration), fried plaice will add to the character's total in both health and mana. It adds 10 to each, never exceeding the maximum level available to him for either statistic.
Raw plaice can only be purchased at one location, either from Philus (who owns the fish shop when the Castaway first arrives in Harbour City) or from Nico (if he buys the shop later). Fried plaice is obtained by visiting a campfire or stove while raw plaice is in your inventory.