Mystery creature in Utah pond

When a pond in Brigham City, Utah, froze over, over 4,000 fish turned up dead - caused either due to the pond being poisoned or lack of oxygen due to the thick ice. The strange, fanged creature was found amid the carp and goldfish which the pond had been stocked with. Biologists said they are not sure what the creature is and that it could be a type of trout whose tissue decomposed rapidly, making its teeth more prominent. Aquatic biologists said if they can't figure it out, they'll let the fish decompose fully and then examine the bone structure to determine the species. Source: Local6.com via: A Fiend's Folio