It gives you all the mats for Fish Feast - Item - World of Warcraft
And those sells good on my server. 3g each of them.
Musselback Sculpin - Item - World of Warcraft 3g
Glacial Salmon - Item - World of Warcraft 3g
Nettlefish - Item - World of Warcraft 3g
Fishing takes 17 seconds as of 3.1 patch.
My calculations tells me it gives 600g an hour, Or even more becaus it doesent take 17 seconds to the fish to nap.
Or, For 6 + 6 + 6 = 18 G.
18 G for the mats to a Fish Feast,
A fish feast goes for 40g EACH on my server.