just like Evocables said the reagent fish sell really nice.....
Oily Blackmouths sell really good. Sagefish also will be a plus to use for healing and mana. However, they dont sell as good as Oilys but they will sell.
Plus, not sure if on your continent, Firefins sell really good to.
Both Oilys and Firefins, if one of your profs is alchemy, become useful to you in making potions and oils.