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Re: Live Foods Digest V3 #145

Hello Mach,

It is possible, that from time to time I might have inoculated an old
algal culture. But normally I would remove ~90% of the water, replace it
with fresh water -- I should then be somewhere in the log phase -- with
same negative results -- no algal consumption. In a week or so, the
culture would be back to the same green opacity and stay there.

At other times, however, with different algal "soup", the Daphnids would
clean it up in a few days and I would have to feed them my yeast/algae

The difference ? -- I just don't know!



> Date: Tue, 27 Feb 2001 07:24:30 -1000 (HST)
> From: Mach Fukada <fukada at aloha_net>
> Subject: RE: Greenwater
> Hi George,
>         maybe waiting too long to harvest the microlagae. From what I
> remember at a certain age the algal cells will produce toxins as a result
> of being over populated.  Apparently these compounds are deposited in the
> cell walls making the algae unuseable by most filter feeders.  I suppose
> in terms of the population growth curve for microalge it is refered to the
> death phase.  The culture needs to be harvested inteh exponential growth
> phase, such that it keeps the culture in the culture in the growth
> phase.  Hence, my large cultures get harvested at about 50% total volume
> every day (well not so much now that the weather is cold) .
> On Mon, 26 Feb 2001, Live Foods Digest wrote:
> >
> > In my hands algae -- "green water" -- sometimes work, most often they do
> > not work! I have not tried to culture a specific alga, but the "green
> > soup" I sometimes manage to get, does not seem to feed the Daphnids.
> > They just swim in it, for weeks, without diminishing the color and
> > opacity of the water!
> >
> > I don't know whether the difference lies in the different strains of
> > Daphnids, different water, algae, or what, but the literature is full of
> > various "magic" recipes that seem to work only in specific cases.