NBCrappie i have a saltwater aquarium and have had a fish with the same type of thing happen to it, have also caught a channel cat that was goofy looking (looked like its back was curved down in a hard turn from behind its head to its tail). looking in to the condition i have found 2 possible causes in the saltwater fish. sporoza or tuberculosis, either way no treatment, and the fish soon found himself in the big porcelin bowl in the sky. either way have seen a similar thing in a channel cat.