Sloppy ranching and farming- poor husbandry practises- kill fish. Runof from cattle lots, pesticides, manure pits, erosion from overgrazing, and cattle freely roaming up and down river environments kills fish. Many ranchers are changing their ways. Slowly though....
I know that some people don't think too highly of Ted Turner, but, in his effort to reclaim habitat for "native" (I put quotes here, because the fish in question were not local natives, but a re-introduced native specie) cutthroat populations, he replaced the cows on his mega-ranch with buffalo. Apparently, buffalo behavior doesn't thrash the streams like that of cows. Nonetheless, I suppose that a low cow to river mile ratio (as in a large ranch) would not create the level of impact that a sloppy corporate farm does.
I'm missing something here............Cows don't kill fish, but cattle freely roaming up and down river environments kill fish??????
Being involved in stream restoration, I 'd be interested in knowing where the "many" ranchers are changing their ways. A few are changing and they deserve lots of credit.