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Re: [Killietalk] Blue Gularis incubation
Pjeversman at aol_com wrote:
> If the eggs are truly infertile, how you incubate them is irrelevant,
> Philip J. Eversman D.D.S.
It sometimes is easy to distinguish infertile eggs from those having
hatching difficulty. Unfertilized eggs tend to turn cloudy white rather
quickly, and fungus finds and devours them if you have not done
something to control it. If you have, they just stay cloudy and
Fertile eggs will stay clear and usually eventually develop an embryo
that is visible. Even when the eye is fully developed and staring back
at you, such eggs may not hatch properly.
The larva must secrete a digestive enzyme that corrodes the egg chorion
from the inside, so the shell is weakened and the larva can hatch out.
If a cross-linking agent (tanning agent), like formaldehyde, acriflavin,
or even harder water has toughened the shell too much, the baby cannot
escape the shell and will eventually die.
An intermediate case happens when the egg is prevented from developing
through the various stages. In that case, the egg may be fertile but
stays clear forever. Eventually, bacteria penetrate and the egg is then
killed and devoured by fungus. I don't know why this happens, but my
guess is that temperature, pH and water chemistry (dissolve gas?) may
interact to cause the stalled diapauses.
The above situations can all be observed with a 2 or 3X magnifying
glass, and it may pay to determine which is at fault before trying to
correct the problem.
This is all easy for me to say, because I have never tried to breed SJO!
Wright Huntley - 805 Valley West Cir., Bishop CA 93514
whuntley at verizon_net 760 872-3995. Cell 760 937-2276
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