Monkfish are fish which can be cooked to heal 16 hitpoints. They are fished in Piscatoris (AKQ) and require a fishing level of 62. You must also have completed Swan Song. They also require a cooking level of 62 to cook.
Each monkfish caught will yield 120 fishing experience and each fish cooked will grant 150 cooking experience.
It is possible to earn 200,000 experience per hour cooking monkfish with level 90 cooking with minimal burning.
Utilizing the cooking gauntlets at the Hosidious Kitchen, burning becomes much less likely.
Catching and cooking a monkfish is needed for the hard Western Provinces Diary.
Burnt monkfish has no use in-game.
Fresh monkfish are caught while completing the Swan Song quest. These monkfish heal 1 HP when successfully cooked and then when consumed.
During the quest, Arnold Lydspor asks the player to refill the food stocks. It is advisable to fish extra fresh monkfish due to the high likelihood of burning some when cooking.