my brother just got the HD go pro, it came with a waterproof case. excellent quality picture and very stable. i would advise you to get the larger card it is expensive but worth it for longer videos. here is a link to check out, it's not fishing (dirt bike riding in glamis) and kinda long, but gives you an idea about the camera. hopfully i can steal it from him this summer for some fishing footage.
http://vimeo.com/9776121