That species is irreplacably, irrevocably gone . Somehow, I think the way we treat this planet and the other animals that inhabit it is not what Darwin had in mind when he came up with the theory of evolution. I am on the St Lawrence River, I buy and sell line caught fresh River Perch, some people won't eat it because the world says don't eat fresh water fish. I have been on this river most of my life and it is it's cleanest in probably over 100 years. But there is still insistence that the fish should not be eaten.
Demand is high though.
I believe that with fish- there are a lot of factors that chefs know nothing about. The fact that global warming keeps our lakes from freezing creates that the eco systems in fresh waters have been altered. So have the fish, both in size and quality. Why is there no concern over Farm Raised Trout, this stuff is the worst, no flavor or texture. Unfortunatly or maybe fortunatly for the fish - the current and the rising generations don't much eat it anyway.