most fish are raised by people who use salt in their ponds.
fish "carry" most pests they come in with (no spontaneous generation) so if there are
pests, they are already resistant or they arent.
salt in the tank is NOT for treatment... it is there to stimulate the turnover of the
slime coat. fish make antibodies that are secreted into the slime coat... they also
make antimicrobial proteins similarly secreted. so a consistent turnover means pests
are being attacked by fish defenses more consistently.
low salt levels also helps with osmotic pressure.
Ingrid

Geezer From The Freezer wrote:

surely pests would get used to the low levels...

wrote:

except that Jo Ann Burke, the leading expert in GF in the US (maybe the world) says
to use low levels of salt to head off problems. Ingrid



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