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Re: raising daphnia: From George Davis, et al
What George is doing to generate greenwater is very sound IMHO. However I
would suggest some sort of water movement with the fish who are in the
greenwater tank. While still tanks will work, especially with active fishes,
sometimes there will be a die-off or at least a settling out of the
greenwater. I would hazard a guess that water circulation helps in this
regard. I use either a solid airline tubing, a box filter without anything
in it or a small power filter without filter medium (you don't want to
filter the greenwater out). Water movement and gas exchange at the surface
are the goals.
Even though George didn't notice a difference, you might get better
production on indoor daphnia cultures with the air. (Outside the wind and
weather does this for you.) Unless you are really into labor intensive care,
you may also find that larger containers, placed in cooler spots in the
fishroom, may be more productive and less likely to crash. Better air
bubbles from a piece of hard airline tubing so they aren't small enough to
get under the daphnia's shell edges and float them.
Another thought, also not mine originally: put a light (even a small one)
over the daphnia tank 24/7. That way they will not crowd into a corner at
night and suffocate. (It may prolong the reproductive career of any resident
greenwater too.) I know, they don't have this in nature, but ponds are
seldom rectangular. ;)
All the best!
Scott
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