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removing rotis and ciliates from microalgae culture
- To: Live-Foods at actwin_com
- Subject: removing rotis and ciliates from microalgae culture
- From: Bob Williams <williams at 99main_com>
- Date: Mon, 26 Aug 2002 08:09:33 -0400
- In-reply-to: <200208260758.g7Q7w2M21482 at acme_actwin.com>
- References: <200208260758.g7Q7w2M21482 at acme_actwin.com>
A splash of water, a few bad assumptions, and I recently found my entire
saltwater micro-algae culture wiped out by a rotifer bloom. I'm bouncing
back, but seem to have some ciliate contamination which, if unchecked, could
be just as bad in time.
Yes, I will go back to carefully maintaining a couple clean tubes of algae.
And yes, I can always get more starters. But it got me thinking. Is there
anything commonly available that is 1) selectively toxic to marine
zooplankton such as rotifers, ciliates etc... but not to phytoplankton and 2)
short-lived, so that the water would be cleared of zooplankton, the algae
will keep growing and can then still be used to feed zooplankton after a
period of detoxification?
An article from the Artemia Reference Center mentions using CaO to raise pH,
or a combination of urea and hypochlorite, or possibly rotenone for killing
larger predators. I don't know how effective they will be on rotifers and
ciliates since rotis seem to tolerate higher pH and eutrophication conditions
better than, say copepods. The rotis could be fed to delicate creatures, so
I can't have any residual toxicity.
So far, I haven't had much success finding a mechanical filter that will pass
something like Isochrysis and not also pass roti eggs.
williams at 99main_com