I read on Montana's FWP page, how anglers who kept personal fishing logs helped track the first cases of Whirling disease in Montana to the Madison River back in 1987. To date, 848 anglers have contributed to the Fishing Log Program.
The only downside is that the FWP has to make the entries by hand. Wouldn't it be great if the FWP hosted an online Fishing Log Service so that fisherman could login and make a Fishing Log Entry that would then be automatically archived? What's more, the process would probably be much cheaper than what they currently have. There's plenty of open source or free applications to accomplish the task. Movable Type comes to mind!