Re: [Killietalk] Moina from peat

["KeeHoe Leong" <markc at wire-online_com>]

Hi all, from what i read so far on the internet. Daphnia normally
reproduce ass_exually and the offspring always is female daphnia
(instead of egg). In respond to change of light cycle/ temperature/
drying up of pool, female will produce male daphnia and that allows
them to reproduce s_exually which produce winter egg.

Winter egg can with stand cold, drought and they hatch when summer
arrive. The hatchling is always female.

So what you receive might have some winter eggs in it and hatch along
with the fish.

To get winter eggs, the changes have to be gradual as it takes time
for the male produced to mature and capable of se_xual reproduction.

Hope that helps.

On 8/27/07, Barry Cooper <bjc3 at centurytel_net> wrote:
> I had a 300 gal tub in Ithaca, NY with my daphnia culture in it. It used
> to freeze solid every winter but the daphnia always came back.
>
> Here is the mild climes of the Pacific Northwest I also have Moina
> cultures going year round. They are not very productive in winter and I
> don't really harvest them then, but they always bloom in the summer.
>
> BC
>
> Barry J. Cooper
> Sweet Home, OR 97386
>
>
>
> Edd Kray wrote:
> > "How come I never noticed this phenomenon before?"
> >
> > Response: just luck.
> >
> > I have a 50 g plastic tub moina culture that sits outside year round. Last
> > winter, of course they died out when it got cold, down to -19F a few times.
> > This spring when it warmed I was curious if they would come back when things
> > thawed. Yes, they did. The resting eggs survived the winter in the horse
> > manure substrate and this summer's culture is as good as last years.
> >
> > Edd
> >
> > -----Original Message-----
> > From: killietalk-bounces+edd=catfishnthecrawlers_com at aka.org
> > [mailto:killietalk-bounces+edd=catfishnthecrawlers_com at aka.org] On Behalf Of
> > Erik Thurfjell
> > Sent: Sunday, August 26, 2007 1:19 PM
> > To: KillieTalk at aka_org
> > Subject: [Killietalk] Moina from peat
> >
> >   Hi everybody,
> >
> > Early this month I tried to hatch an old peat with eggs from Austrolebias
> > bellottii. No fry emerged. However, after a few days I noticed movements in
> > the small hatching container and could collect about ten seemingly mature
> > Moina. In three weeks time I managed to raise a culture from these
> > individuals. I presumed the Moina had survived as adults in the peat since
> > they looked mature when I found them so I tried to check this theory with an
> > experiment. I put a batch of Moina in peat which I wetted after ten days
> > without any survivors present. So, I guess it was resting eggs present in
> > the peat from Moina who survived earlier feeding in the bellottii tank. They
> > hatched when wetting the peat and grew very fast too adult size. How I guess
> > newly hatched fry quickly feed of nauplie when present and that I was more
> > observant than usual since I really needed a hatch of bellottii. Has anybody
> > similar experiences with Moina?
> >
> >
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-- 
Markc (KeeHoe), Singapore
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