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Fw: raising daphnia: From George Davis
----- Original Message -----
From: George Davis <gwd at magpage_com>
To: <killietalk at aka_org>
Sent: Thursday, October 12, 2000 05:40
Subject: Re: raising daphnia: From George Davis
> ----- Original Message -----
> From: Doug Dame <dameda at shands_ufl.edu>
> To: <KillieTalk at aka_org>
> Cc: Doug Dame <dameda at shands_ufl.edu>
> Sent: Wednesday, October 11, 2000 16:08
> Subject: re: raising daphnia (was: Babies making babies) <== ATTNGeorge
> > George (and other topical experts can chip in, of course !!!) :
> > A week ago, you posted a msg to KillieTalk entitled "babies making
> that was really was devoted mostly to raising daphnia indoors. I'm
> interested in doing that .... and it seems like other people would be too,
> give the ever-rising price of brine shrimp eggs .... and so am hoping you
> could elaborate a bit on:
> > * the lighting and other conditions for your 15 gal "green water tank".
> Other than the few fish, do you do anything to actively stimulate the
> stuff? Have you had any green water crashes / do you think it'd be
> worthwhile for me to perhaps keep two smaller (10 gal) green tanks, in
> one crashes unexpectedly? Any particular reasons why std. glass aquariums
> should be preferable to rubbermaid-type containers for this purpose, or
> The 15 gallon tank is lit by two 48" flourescent 40 watt bulbs in a
> shoplight laying directly over two 15 gallon tanks. The light goes
> over the green water tank. Tank is open at the top. I do not try to
> stimulate the green water other than feeding the fish flake food. I have
> had only one semi crash in three years (please don't jinx me). Two tanks
> sounds great because you might try to fertilize a bit. However,
> I pour the final daphnia right into tanks so I don't want to be putting
> fertilizer, ie nitrogen products into my tanks on purpose. I think the
> glass is better because you can actually "see" your green water in the
> I think I have avoided some crashes by going lightly at times removing
> if it has thinned too much.
> > * how many 2-liter bottles of daphnia are you maintaining, for what
> of harvests ? How often do you harvest, and how much?
> I have 18 cut-off two liter bottles going. They sit on a work bench
> with a double flourescent over head about 2 feet away, on 17hrs/day. I
> don't think the light matters much, because they already have the green
> water then. When a dapnia bottle is populated well and clearing the green
> water, I harvest half by draining through a net or pouring directly into
> killie tanks. The waste water is collected to dump on the garden outside.
> I harvest between next day to three days depending on the vigor of the
> culture. Any longer than that I toss the particular bottle, fill half
> a vigorous culture and fill with green water. The harvests from a bottle
> will provide food for one to three days for a pair of killies in a
> > * are the daphnia bottles bubbled ? lighted ? filtered? water changes?
> how often do you add more green water? how much?
> Bottles are still, no bubbles. Tried that once with no discernible
> benefit. Think I answered the others above.
> > * any particular type/s of daphnia that have worked well?
> Pulex and magna have worked well for me. Moina has tended to have a
> slow burn out rate. Try to keep your different daphnia separate! If you
> have success with the moina, I would love to have a starter culture. The
> magna are huge (maybe a 1/4 inch!).
> > * any other questions I should have asked but was too ignorant to think
> This took longer than expected . Gotta run off to the real job. The
> one that interferes with my killie time but pays the rent.
> George Davis
> Wilmington, DE
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