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Re: Water conditions for BBS hatchers
LeeH920226 at aol_com wrote:
>
> I don't believe I have seen in this discussion any mention of any differences
> between Utah, San Francisco and other sources of brine shrimp eggs. Is there
> a difference in salt requirements, temperature, hatch time, etc.?
I don't think so, Lee, but we are still just learning about some Asian
species. All the BS in lakes in the western US are *Artemia sanfranciscana*
they have recently discovered. [Eggs move around on bird feathers, etc.,
apparently.] The smaller eggs and nauplii of those gathered here on the bay
ponds are that way because of environment, but are exactly the same species
as the Great Salt Lake shrimp. The same hatch techniques work about the same
on them. I do get slightly quicker hatches with the smaller SF Bay eggs,
tho.
I learned to despise the few Asian eggs I tried, because there seemed to be
no way to get the hatch time to be reliable and spread over a short time. I
had eggs hatching over a period of 8-12 hours, which meant that many had
lost their yolk nutrients and molted before many others even hatched.
Collection was too much headache. I'm sure the folks at the BS factories
will find ways to simplify the process, as they import more and more of
them.
Some general rules when fighting such problems are that lower salinity and
higher temperature tend to shorten hatch time. Pre-soaking them also reduces
it. The start-to-finish hatch time spread needs to be 4 hours or less to
make them useable, IMO. The spread drops if the overall hatch time is
shortened, too.
Folks try to pre-etch tougher eggs by using small amounts of chlorine
(bleach), but it never seemed to work very well for me. My decapsulation
experiments also left me with too much complexity to do it for every day of
the year.
I'll be over visiting at SF Bay Brand soon, and expect to pump them about
these subjects.
Wright
--
Wright Huntley, Fremont CA, USA, 510 494-8679 huntleyone at home dot com
If it ain't broke, don't fix it -- and, especially,
don't let politicians fix it. ... Thomas Sowell
*** http://www.libertarian.org/ ***
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