Steve -- I don't have a lot of factual information to add. I guess in general I'd say that I do worry about over-using antibiotics. There is no doubt that resistant strains can and do evolve. However, I will admit that I at times still do use "prophylactic" treatments, so I am not without fault. For example, when hauling bass or bluegills at warm water temperatures, they sure are very susceptible to a bacterial disease (Columnaris). So, I like to haul them in water with an antibiotic. Am I part of the problem?
I have been posting, but it must not be on topics that interest you?? :-)
Dave