Just something simple which would help improve the fishing experience.
Could the jumping fish animation be modified to display a collection of colours representative of the fish currently fishable from the node?
Fishing needs a lot of work but it's hard to make many suggestions when so much of the base mechanics of fishing are unknown and the current rewards are to low to counter the time investment which would be required.
Anyway I'm interested in any reasoning why this would be a bad idea because I can't see any downside.