Originally Posted by
rlablan
http:///forum/post/3259949
For ick, 5 mins maximum is what you need to burst the little buggers. Anything more than that will just stress and suffocate your poor fishies.
The ick will burst pretty darn quick when it comes to freshwater dipping.
My opinion is that 20 minutes of being in freshwater, where they couldn't breathe and function probably did them in. A few minutes is cool but imagine holding your breath for 20 minutes straight?? I dunno... that's what I think.
suffication as you describe is not the issue. saltwater fish have to excrete excess salts with the amount they constantly take in with the water. put them in freshwater they still excrete salt (too much) and their nervous system shuts down and they can become dehydrated internally. they may (or may not) sufficate but its because the nervous system shuts down not because their gils cant obtain oxygen from the water. sort of like your heart rythms going haywire if you pump out all the K salts out your body (but different lol).
anyway 20 minutes is way too long. I've freshwater dipped a few fish (5 minutes) and they've done fine (pH balanced with a little alkalinity supplement anda temp matched).