I'm no biologist, but I wouldn't jump the gun with fish kill talk. Tilapia aren't allowed to be released alive, and plenty of bass get killed from tournament fishing when they are caught in deep water and not fizzed or allow their air bladder to adjust. So many of them just float until they die or are able to swim deep enough for their bladder to deflate. Shad, could be the major cold front we just had, hard winters kill shad all the time. Hopefully not a fish kill, but only time will tell.