Easy quest, not all that exciting but you do get alot of travel in.  I started this quest by doing the fishing spot in Swamp of Sorrows for the Mahi Mahi.  For this one just go to the southeastern most corner of the map, that seemed to be a good spot because there wasnt that many of the murlocs roaming.  Next I flew to Grom'gol, on this one make sure you run far enough away from the town to where it says 'Savage Coast' if you dont you'll be fishing for awhile and wondering what the heck is going on.  I got the Sailfin on the 3rd cast.  Next I took the zep to Orgrimmar then hoped a flight path down to Desolace.  Just south of the village is a small water inlet where you need to go to fish out the Striker.  This one took me over 30 casts I must be unlucky and finally I flew down to Feralas, you have to go to the lake in the middle of the map(near DM).  Boom quest complete, Artisan fishing once you talk with Nat again.  Oh and make sure before you initially talk to Nat that you have 225 fishing, I went out there at 200 because I thought I'd be able to get the quest but he is a stickler about it, so I had to fish out at his camp for and hour to reach 225.  Good luck everybody