We have been catching chanell cats with black spots or better discribed as splotches as they are not round and no pattern to them. I have been fishing this same lake for 60 years and this is the first time I have seen anything like it. Smaller fish don't have the black on them. It seems 6 pound is about the dividing line. Everything under six pound, no spots. Over six pound have spots. We caught five fish five pound or smaller, Sunday. We put back eight fish with spots, up to 15 pound. Any ideas. Kenny West central Ohio.