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Re: Live Foods Digest V3 #111


Most probably you overfed your Daphnia culture with the cucumbers --
"Too much of the good stuff"!

Such crashes are reasonably common. That is the reason why most
culturing directions recommend at least two containers with Daphnia. If
one crashes, the chances are that the other will be OK and can be the
start of another culture.

See whether you have ANY Daphnia left in the culture water. If so, they
are the hardier specimens and will make a good start of a new, more
robust, culture. 

Change about 1/2 of the water, adding the new water SLOWLY, (best
letting it run through an air line overnight). Your surviving Daphnia
(if any) don't need any additional shocks. Feed sparingly, if at all.
The survivors should start multiplying in a few weeks. If in 4 weeks you
do not see any Daphnia -- it's all over.



> Date: Sun, 21 Jan 2001 14:40:59 -0800 (PST)
> From: J Miller <ruddigar_99 at yahoo_com>
> Subject: Daphnia crash
>   I have had a 15 gal tank going for a few months now with Daphnia.
> The other day when I was cleaning out the fridge, I found some cucumber
> that had gotten pretty soft, so I thought I'd through it in the Daphnia
> culture.
>   I guess that was not such a good idea because now there is hardly
> anything to be seen in the tank - save for a few copepods.
> Other incidences that have occurred around the same time:
>   I dropped the air line from about 1.5" from the surface to the bottom
> of the tank.
>   This seemed to clear up the water pretty quick - it would usually
> remain cloudy for a few days after feeding, but changed to becoming
> clear the next day.
>   I was feeding a mixture of yeast and crushed prepared fish foods -
> enough to cloud the water, but not completely choke them out.
>   I had a huge bloom about three weeks ago, but the pop'n has gradually
> decreased until it crashed yesterday.
> Sorry for the longwindedness, but I tried to be as thorough as
> possible.
> Thanks
> =====
> J. Miller
> Edmonton, AB, Can.