So the bag we get for doing fishing daily is bad. we get a vendor gray item worth under 2 silver and maybe a potion or perhaps a fishing hat that can be acquired in shatt and dal fishing dailies. It also doesn't have nearly the potential for rewards like other fishing dailies.
Now the quests are pretty good and I like the idea of increase skill for doing them but rewards really suck compared to cooking one were you get awards to get recipes you need to level up.