[5NL] KQo, OOP, river decision.

^^ I would agree if it was heads up against BTN, but don't you think that, as yAAwn said, the UTG fish being rather likely to call warrants the donk bet? Or are you saying that you would call a raise if action goes hero bets / fish folds / reg raises?

Then for the river if you check, how big a bet would you call here?