I understand there is a a lot to be worked out, and stuff like this will be last on the list. I don’t think this is already implemented, but based on the information you get when you catch a fish, it seems this would be relatively easy.
Each server would have its own set of records, for each fish species. Maybe a special reward for the record holders, such as a fishing pole unique only to record holders.
Anyway, thought this would be fun. Great job on the game… even with the unfinished parts (water walking,) queues, and what not. The game is a fresh surprise.