Auto-fishing seems to be bugged to some degree.
I have master 9 fishing on my character Lawlo (family - Imba) and after leaving him on autofish for ~12 hours, he managed to catch ~15-20 white fish and nothing else.
The durability of the rod had also barely decreased, which confirms that there were very few throws involved.
During this, I had +5 Fishing, a Steel Fishing Rod and a fishing costume on top of the +5 if that matters.
Manual fishing seems fine though
My discord is Marcus#1337