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Re: Kordon Bags For Incubation
Drummond Howard wrote:
> Somebody correct me if I am wrong, but I could swear I read these bags only
> worked with water. o2/co2 from/to water/air. It didn't make sense to me at
> the time, but I just figured the writer knew what he was writing about. It
> could have been it was more efficient with water/air verses air/air. I
> guess I should check and see if Kordon has a web site.
They do, but last time I looked they didn't cover the subject very well. You
may have to go to www.novalek.com to find them.
You are exactly right, Drummond. I killed a nice bunch of young Rams,
because I did not understand their function.
Regular 1.5 mil poly bags apparently do transfer some oxygen and CO2,
whether in water or in air. We've had reports here of fish living for over
30 days, in a normal fish bag, when forgotten in a cooler.
The difference with eggs was most dramatic to me, when I compared regular
fish bags with heavier, 7 mil freezer zip-lock bags. The freezer bags seem
to do the same thing taped Petrie dishes do. They seem to kill the eggs
(force them to hatch in the peat?) if gestation was more than a few weeks.
Float a "breather" bag to equalize temperature, and in minutes the fish are
gasping at the surface (if there is one!). I would be suspicious of whether
the gas transfer was as complete when air is on both sides. [Kordon does
suggest them for shipping plants, so maybe air-air transfer does work.]
Don't risk any valuable, irreplaceable eggs on them, tho, for I still
suspect they aren't a good idea. I'll be pleased to be proven wrong, for, so
far, I have found them utterly worthless for shipping live fish. I know
others' mileage varies. Cichlid spines (and Cories') make them an extra bad
idea, for the way you must pack them guarantees the bag must drain
completely if punctured. Fortunately only American-Flag Fish, among all
killies, have a stiff fin ray.
I like burst bags to lie in a puddle, by enclosing all of them in a garbage
bag, so the fish retain some water. That is exactly what one must *not* do
with breather bags. Apparently, they are thicker and tougher now, than the
first ones I tried, so the chance of a leaker is down a bit. I'm still
gun-shy about them, as you may be able to tell.
Wright Huntley, Fremont CA, USA, 510 494-8679 huntleyone at home dot com
[Applies equally to Republocrats and Demopublicans]
Way easier to whine about darkness than
pull your head out of... well, that
place where the sun don't shine
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