I was fly fishing yesterday at a local pond in Fairplay CO and I caught a small brown trout. When taking out the hook I noticed it's teeth (specifically on the bottom) were all black. Because of this you could easily see the each little black spike in it's white mouth. After touching them they were very sharp and seemed sharper than your average trout but maybe it's just because they looked so defined. I have never seen a trout with black teeth and I can't seem to find any photos online that are even close to what I saw. Has anyone ever seen something like this when trout fishing? I didn't think much of it it the time but now I really wish I took a picture before I released it. I've fished since I was a boy and I can identify different trout species easily. I'm 99% positive that this was a brown trout. My only uncertainty is from the black teeth. Please let me know your thoughts. Thanks and any feedback would be kindly appreciated.