Not really - but. I tend to find some fish are more abundant in some spots than others.
I like to fish the river through Trinsic, the river on Buccs and Gravewater Lake - the lake gives me a chance at Holy Mackeral
Unfortunately we do not know how the new fishing has been really coded but I do hope that the developers have put some fishing "heart" inside the fishing code....
What I am trying to say, is that one peculiarity with fishing in real life is fishing "spots" which fishermen get to learn through experience and, occasionally (but more likely seldomly..., perhaps
share with other fishermen. I am talking about spots which either yield more catches, better catches or catches more frequently yielding the type of fish that they are seeking. Infact, it is quite usual to hear from fishermen about their "favourite" fishing spots.......
So, I'd really love to hear that in Ultima Online this "heart" of fishing has been coded for our virtual fishing and that also in UO us fishermen can get to learn our favourite fishing spots because they either yield more catches or are more likely to yield the type of fish, crab or lobster we are really looking for...
But only a developer can really answer this question.