I use a canon DSLR for my pics, but not when fishing! No way i'm getting that puppy wet.
For all my fishing shots I use a Panasonic Lumix, its waterproof, has lots of functions including hd video and a very good micro zoom. All the brand cameras have a waterproof version of good quality and they all take good pics so I would look at the differences, for example the auto settings and the settings that you can change are the things that vary the most. If you just want to leave it on full auto any point and shoot will do the job.
Here are some shots from the Lumix
Macro zoom, hand held standing in the river setting!
All the best.