well actually, I did just buy a DSLR (it's an Olympus E510... best value on the market) but I decided a long time ago, that DSLR's were not a good choice for self taken fish photos.
I use the Canon A series 630 and 640 {and fixing to buy an A650 as a go everywhere car cam}. Their are several things about the Canon A series that I think make them ideal as fish photo cameras.
1) They have a flip and twist LCD screen, so I can see where I'm lining up in the frame, when I'm doing my self-taken (most of them) fish shots with a tripod. This is HUGE !
2) They use AA batteries. Sure, I still use high quality lithium Ion rechargeable AA's, which do have a pretty long shelf life (months).... However, I also carry a couple sets of old school alkalines, for my backup power, which have a superlong 10 to 15 year shelf life !
The problem with proprietary rechargeable batts is, even if you carry a spare, or two, the chances are good, that if the one in your camera has died, from just sitting around unused, so have your backups :-(
3) My Canon A series have a function / feature called the custom "C" mode. In this mode I can put the camera in manual {at home in the back yard, with all the time in the world} and get it totally dialed in.... exposure, manual focus distance, F stop, fill in flash, even the self timer.... and when I get it tweaked in just right, I hit the "save settings" feature, and it remembers everything. So the next time I stick a big one, I pull the camera out, put it on the tripod, turn it on in the "C" mode, and Bam ! It's good to go ! Heck, even if I had another angler with me, he wouldn't likely know how to use my camera like I do. So basically, my "C" mode is like having myself behind the camera, and in front of it too :-)
4) The Canon A series are small, and compact, and relatively cheap. I got mine for $200 and $240..... but they were really popular, and when the A650 came out "if" you could still find one, the prices spkied to like $300 and $350. But no worries, the A650 will do anything that these will (and then some), and can be bought for about $290
5) The Canon A series take very nice pictures. Some of the fanatics on the camera forums say that 10 mega pixels on such a small photo sensor is not a good thing, and they slam these cameras for it. But the thing is, as long as you shoot in sunlight, with an ISO of 80 or 100, "or" if you have to shoot and lower light, and don't mind flash, you will not have any problems with grainyness (digital noise) problems.
I've posted this before.... But my Pelican Box with my A630, my A640, spare batts, and my certified digital scale, is just about as important to my fishing trips, as are my poles :-)
Hope this helps,
Peace,
Fish