With the new rush of people lvling cooking there are a few fish that you need in order to advance that the vender does not sell, those fish are the Golden Carp - Item - World of Warcraft and the Jade Lungfish - Item - World of Warcraft.
Bot over night and there is an easy 20k gold a day in it for you.
If you wish just to fish for carp and shrimp this is a good thread to read into
http://www.ownedcore.com/forums/worl...ang-wilds.html (Awesome nearly-hidden fishing spot (Krasarang Wilds))
Otherwise any open water in jade forest is perfect.
I have more advance and less "simple" gold guides I plan on making but will need time to suck them dry before I open the flood gates.