I would like to speak about the Ottawa River. I fish in the Ottawa River regularly and I really do love that river. It has excellent elements to it, but there are severely stressed elements to it as well.
Atlantic salmon have been extirpated from that river for hundreds of years. American eel are at less than 1% of their historic abundance, and they were a vital aboriginal fishery. The biomass of the Ottawa River is about 80% channel catfish, the vast majority of which are contaminated with mercury where I can't eat them or feed them to my wife.
There are some serious problems that are habitat-associated in the Ottawa River, and we haven't made progress on resolving those.