well, whaling could be a way to generate food by battle unlike fishing. Another option is killing and selling off a whale will generate a boatload of certain resources.
food from meat, tools from bones, and a chunk of gold from oil and other miscellaneous things.
Plus this could tie in to the mother nature nation, where if you raise hostility too high with mother nature by constant hunting, whales get harder and harder, but more profitable.
edit-just reread things, and realized the suggestion is for a new resource not whaling, ignore my previous ramblings as I am still tired as I have not yet fully woken up