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RE: N. Kafuensis Lochinvar eggs
Joseph Ponnath wrote:
>
> I have some N. Kafuensis Lochinvar that I have been collecting
> eggs from. When
> I first got my original eggs out of the BNL the bag was marked
> for a 5 month
> incubation. This is what I used for the eggs I have now collected from my
> fish. Then I noticed a bag of eggs I collected on May 24, already has some
> eggs that have eyed up. It's only been 5 weeks. The eggs are kept in my
> basement which varies between 64 degrees F. at night to 72
> degrees during the day.
> What is the incubation time that is "normal" for this species?
>
Now that various people have told you what month it is I guess you would
still like an answer to your question !
My personal records for this population of N. kafuensis "Lochinvar National
Park" indicate incubation times ranging from 9 to 24 weeks. Taking all
populations of N. kafuensis into account (8 populations), I have records of
incubation periods (resulting in successful hatches, of course) ranging from
6 to 72 weeks.
There is no such thing as a normal incubation period because, as you have
discovered, this can vary enormously depending on factors that we still
don't fully understand, or at least cannot quantify. If you have eyed eggs
after 5 weeks incubation and get healthy fry then there is no problem. Also,
if they require 10 months to eye up under whatever conditions prevail in
your fish-room then there is nothing wrong with that either. You just have
to develop the experience with the incubation times as they apply to the
conditions under which you maintain the fish and handle the spawnings in
your fish-room and don't pay too much attention to the so-called "normal"
incubation times. These should serve only as a VERY rough guide.
Because of the highly variable incubation rates that can be experienced for
any particular species, even within the same fish-room, I never wet peat
without first checking closely for eyed eggs. If one inspects the peat and
sees only clear, undeveloped eggs, then there is usually no point in wetting
it.
__________________________________________
Brian R. Watters
University of Regina
Regina, Saskatchewan S4S 0A2, Canada
Ph: (306) 584-9161 (home); (306) 585-4663 (work)
Fax: (306) 585-5433
E-mail: bwatters at sk_sympatico.ca
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