Kodak also makes an underwater version. This is fine if the fish is big, but smaller critters look really, well, small. However, if cost and simplicity are important, this camera is a great choice. In other words, they're almost idiot-proof. It even has a delayed shutter option, so I can be in my own fish pictures even when I'm fishing alone.
Picture quality is excellent.
These cameras fit in a pocket and weigh less than a pound. Most of them can withstand rain or wet conditions without damage, and mine is waterproof enough that it won't get hurt if it falls in the water. It also floats - a handy feature when fishing from a boat or pier. One writer I know lost his Pentax IQ Zoom in a lake on a Friday. He found the camera, still floating, the following Monday, finished the roll of pictures and has been using the camera ever since.