Well, as an Alchemist I can say that i'm really wishing I had levelled a little bit of Fisher :(
That said, some very potent potions are done with fishes, most specifically the Mega-Potions of [X], which are a short-lived but gigantic (from what my little experience says) boost to an attribute (they really could use a slightly lower cooldown, though).
But yes, Fisher is pretty underused and it should be used more! Heck, we could have fishscale armor, have a handful more dishes with fish perhaps.
I'm going to let you guys imagine a suitable way to apply them to weapons/accessories since I can't think of it
