Enormous Abyssal Gulper Eel

Source
Enormous Abyssal Gulper Eel are caught in the inland waters of Spires of Arak for those with fishing skill above 700. Players will often catch them with fishing skill above 800.

Gutting them produces a random amount of Abyssal Gulper Eel Flesh. This can also be done automatically while fishing if Bladebone Hook has been applied.