I stopped fishing at 40 species because my impression is that 50 is very nearly impossible (see the thread on Old King Crab--seems like literally no one on the forums has caught it).
Funny thing though--I decided to throw one bucket in DG while I was waiting for someone and wouldn't you know it--Holey Mackerel in one bucket!
8 lbs 10 oz, 42 jb, in dg pg, gold rod