Don't know what it is but this fall I have been catching multiple crappie with large white growths on their fins. Usually more prevalent on the tails. Nasty looking mostly on larger crappie. I've caught multiple crappie in brewer and Nimrod with it but this past week caught one at Conway with this growth. D10 and Idea what it is? Also is it harmful? I've been releasing them cause I wasn't sure if they were ok to eat.