For 2 days my 11 mo. Serama rooster is having labored breathing, his breath smells of rotten fish and his comb is turning black. I assume that that has to be from not enough oxygen. We do have crawfish digging up out of the mud in our yard and the chickens are always eating them. Is there anything I can do because he looks like he's dying on me. He just stands still and puts his head under his wing and sleeps standing up on the ground instead of staying with his social group.