Porel is a fish that is used in lower level Cooking recipes. The most common place for you to find Porel is at the Impetusium in Altgard. The only place possible for players to gather Porel is from Altgard. Porel requires 65 skill in order to collect and since the locations to find it are very spread out.
My favorite place to farm for Porel is at Griblade Crater Lake, mainly because the only reason I'd be farming for Porel is to raise my skill. Around Griblade Crater lake you will find Crystal and Kandula that will also help you get your skill to the Blicora level.