Re: [Killietalk] K. marmoratus Incubation Time

[Gary Hoover <gmh52389 at yahoo_com>]

Fred,
  I would be hesitant to do this with kmar in a saltwater solution.  While you will rupture the egg, there is still likely a high solute concentration (low water potential) within the fry itself.  Thus you could cause a large influx of water into the fish's cells and potentially cause the fish itself to rupture.  I dont know if the solute concentration within a brackish water fish is high enough for this to occur, but I would be hesitant about finding out (unless you have more eggs than you know what to do with!).  Given that kmar is found in variable salt concentrations, this may or may not be an issue, but if the fish spawn in certain places (with certain salt levels), you could be changing the water potential to something the fry is unable to tolerate.  This is all theory and my ponderings, but I would be careful of using that method for a brackish fish.
  Just my thoughts...
  -Gary

Fred Behrmann <athensaquatics at juno_com> wrote:
  Hi Roberto, The initial flow of fluids thru an osmotic membrane is from
less dense to more dense. So water with less TDS flows toward more TDS.
Thin water trys to thin out thicker water. This explodes the
shell(osmotic membrane) and releases the embryo. Agitation changes the
waters surface for more oxygen content so why not use an airstone.
Cheaper than gas for a car and easier than jogging.
Greg Simpson likes to create cartoons for his newsletter and I
can just see 3 embryonated eggs with bubble captions over them. One says
" I want to hatch; take me on a car ride". The other says " I want to
hatch also ; give me a dose of powdered milk". The third says" I want to
hatch as well but just change my water to rainwater equivalent making
sure it is loaded with oxygen." I can't think of anything more loaded
with oxygen than a tiny droplet of h2o falling a mile thru the
atmosphere. IMO. Fire away!

Sincerely,
Fred Behrmann
Athens Aquatics
37 W. Bridge Street
Catskill, NY 12414 Phone:(518) 943-2630
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