Dawn has not been very active and I find him hiding at the bottom of the pond under one of the slate shelves. He does come up occasionally and nips at some food, but he is an elderly fish now, seventeen plus. So I fear the worst.
I think the other fish will be distressed if he also goes to the Rainbow Bridge, but there doesn't seem much I can do. It will be a sad day to lose my big fish Dawn.
Princess Aurora seems to be marshalling the other two and is obviously preparing to take charge.