I'm picking a nit here, but its a rather important terminological nit for some arguments.
Adaptation is a species changing to fit its environment. Evolution implies a certain type of overarching process which creates this change i.e. some genetics are favored and some are not which gives rise to a new species.
While I am not familiar with the fish, the moths is an example of adaptation not evolution. A new species of moth did not evolve due to the industrial revolution. What occurred was a population shift within an existing species from the members with white coloration to the members with black. If you go to this part of Britian today you will once again find white moths because the population has shifted back now that the pollution situation is better. This is the same phenomenon which has given rise to antibiotic resistant bacteria. Essentially you are breeding a bacteria/moth/whatever of the same species which is better suited to the new environment. You are emphasizing a new part of the pre-existing gene pool not creating new material or a new species as the term "evolution" implies.
You could do the same thing by shooting every human over 5 feet tall. You would quickly get a nation of short people, however they would still be humans just shorter. So this is adaptation not evolution.
As an aside, I dont think conservation and evolution mix too well philosophically. Conservation is about preserving current environments, evolution is about species changing to fit new environments and situations. I am not going to protect my closet because the change in detergent I use in my laundry might have created a population shift with the dust mites therein. Why? Because its me closet.
I believe the truth is that the fish will have to adapt to whatever we do because humans are the dominant species. The species that can adapt to cities and stripmalls will do so. Unfortunately those that can't will probably wind up conserved in zoos or stored in genetic banks so we don't lose all their genetic data should they someday become important to us. Or they will evolve into something that can exist in the new environment.
These opinions do not represent those of the US Army, DoD, or US Government.