All to common unfortunately. I was tipped off and nailed a seller using a half dozen or so of my pics for auctions on aquabid without permission, in many cases not even particularly good ones. my pics just started showing up on google recently, I have a feeling it'll happen a few more times.
Yeah, I know, I find quite a lot of images that I have to ask people to remove. Often they are apparently submitted by a third party...
Anyway, the "hosted by planetcatfish.com" text should be appearing on all images and it will soon be impossible to steal them without taking that text too.
Well a friend here in France labelled his name on the pictures and another guy stole the pic managed to delete the name and labelled the pics as one of his fish... some programm sadly allow you to rework the pic and take out the text and make it look real...