Tums,
You say "Also note using salt all the time will make disease also build up a immunity" Does that mean the fish develop an immunity to the disease or the disease develops an immunity to the salt? The first sounds good and the second sounds bad.
DJ The way it was passed to me is that a salt solution that is not strong enough to kill a Bacteria will allow it so build up more of a resistance to salt over prolonged exposure. Same goes for medicated feed when not feeding the correct amount or number of days. The Bacteria will build up a resistance which will make it more difficult to treat the next time.
SRAC on feeding medicated feed
Feeding lower concentrations of antibiotics or decreasing the number of days the drug is fed can allow the bacterial pathogens to develop a resistance to the antibiotic. The antibiotic, then, would not be able to control certain infections that may occur later at your fish farm or hatchery.
