It would be really cool if there was a notification upon catching every fish at a location, or in the entire zone. This would make it easier to work on the fishing log, and avoid the need to open and close the fishing log over and over. A text log message would be very useful, though I think it would be extremely satisfying if a custom message like "Duty Complete" or the blue mage spell learning animation appeared.

Thanks to the FFXIV team for their hard work, I hope this suggestion is interesting!