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Culturing Daphnia, An Outline

20 gallon tank used to raise daphnia

  • Start with old or aged water, keeping the temperature 60-72 degrees

  • Feed a small amount of yeast solution* daily or as needed to lightly cloud the water.  Do not feed if there is still cloudiness.  A small amount may be a tablespoon or 2 of yeast solution for 10 or 20 gallons of water.

    • yeast solution---one packet of dry yeast per pint of water or 2 teaspoons of yeast per quart.  Keep it refrigerated and shake it well before dispensing.  Active dry yeast can be purchased in 2 pound bags for around $4. at a food supply store.  It will last long if kept frozen.

  • Use light aeration to keep the water gently circulating.

  • They do not need light.

  • Siphon off the mulm on the bottom of the tank every month or 2.  Use snails to help clean up.  Red Ramshorn snails work well

  • Put 2-3 seashells in the tank to add calcium to the water.

  • Change 30-40% of the water every other week.

  • Have 2 cultures going to insure continuance


Good luck with your daphnia culture, and if you have any questions, feel free to talk to me about them at the meeting.