I have noticed that the old fishing spell works, now you may ask what the difference is, and why you'd put up with the disadvantage of having to use a fishing pole..
Well, the old spell, had a 10-20 yard range, the new one, has a 5 yard range, so you can be further away from the shore.
If you don't have it in your action bar already I am not 100% sure how to cast it.
I had in my action bar though, and it still functions perfectly, even if it has effectively been replaced with a new one.
Perhaps there is a way to make a macro that casts the old one?