I actually havent used fish at all since just starting out at a very low level of cooking...leveled up on mostly lean Venison, Big Bear Steak (From bears and stag in Ashenvale) and then moved on to Roast Raptor and Jungle Stew (Raptors and Tigers in Stranglethorn Vale)... by level 35 I was at 225. 

I did this instead of fishing, because it was obvious there was no big rush to get to 225 since there's a level req to continue... and it allowed me to keep plenty of stat food in my bags.  AND... being a skinner I was able to get a little more out of hunting the animals for cooking.