With all the people trying to grind up Cooking because of the new daily quests, and with the change to recipie skill levels that makes it quite difficult to level past 275 Cooking if you're not a fisher, there's a steady demand for Raw Whitescale Salmon on my server.
You can get a good supply of these fishing the Master's Cellar in Deadwind Pass. Alternately, level up your fishing at Lake Mereldar in the Eastern Plaguelands.