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Thread: Daphnia

  1. #9

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    par-then-o from Greek, from parthenos, virgin

    gen·e·sis (jn-ss) KEY
    NOUN:
    pl. gen·e·ses (-sz) KEY
    The coming into being of something; the origin.

    par·the·no·gen·e·sis (pärth-n-jn-ss) KEY
    NOUN:
    A form of reproduction in which an unfertilized egg develops into a new individual, occurring commonly among insects and certain other arthropods.
    ETYMOLOGY:
    New Latin : Greek parthenos, virgin + genesis

    Well, yeah. I guess I should have wrote "reproducing" rather then "breeding", I stand corrected, sort of. . .

    Basically, when conditions are good, Temps, food, water quality, they reproduce parthenogenetically (sorry I spelled it wrong) The females produce unfertilized eggs of more females (clones)that pop out and swim around doing their thing. When conditions change, some males start to develop and they mate and then the females start to develop resting eggs that drop to the bottom and wait for better times.

    I raised Daphnia Magna and Monia for more then ten years to feed aquarium fish I used to have and in my experience they general cycle was like this.

    Winter, The tub was frozen solid, I used a 55 gallon plastic drum, no Daphnia (obviously)

    Late winter, the tub wasn't solid ice anymore. If I broke the ice on top there was usually some, but not a lot of Daphnia swimming around.

    Some time between late winter and early spring, The Algae would start to bloom fertilized by the dead Daphnia and algae from last year.

    Throughout spring and summer, The Algae would bloom, and then the Daphnia would bloom, eat all the algae and then start to die off when there wasn't enough algae. Once the over population of Daphnia was gone. Either from me harvesting them or a die off, the algae would come back, and then this cycle would start over again.

    That is until it got too hot. Then the males & resting egg stuff would start. Then there would be either no Daphnia at all or just a very few swimming around struggling in the heat but if a hot spell lasted more then a week there would be no Daphnia at all.

    Late Summer and Fall. As the water cooled, the resting eggs would start to hatch and then back to the usual cycle until the water temps dropped to around 35f or 40f. Then there would be much fewer Daphnia but they'd stay around until the water finally froze solid. If I used Roti-rich I could still get harvestable quantities.

    Monia are much more heat tolerant but less resistant to cold.

    I also raised them indoors in a 20L tank using roti-rich all year in smaller but stable quantities. I used a sponge filter in the tank with a lot of extra airation. No heater with a 20w flourecent tube.

  2. #10

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    Quote Originally Posted by [b
    Quote[/b] ]Throughout spring and summer, The Algae would bloom, and then the Daphnia would bloom, eat all the algae and then start to die off when there wasn't enough algae. Once the over population of Daphnia was gone. Either from me harvesting them or a die off, the algae would come back, and then this cycle would start over again.
    interesting... I grew mine in a mayo jar [img]http://www.**********.com/iB_html/non-cgi/emoticons/new/smile.gif[/img] and what I noticed was that I had a nice, totally green jar full of algae, then I added the daphnia and there was an explosion of them. They ate all the algae so the water turned transparent, most of the daphnia died, and I never got more algae. I guess the daphnia ate other things and when the algae tried to grow back they would eat it.

    where did you get the definitions? is there like an online surfix dictionary or something?
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  3. #11

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    There is a link on my yahoo home page to look up words. Those definitions came from The American Heritage Dictionary. I mean't to reference that but forgot.

    I would think that a jar a small as your's would be too small to mantain a healthy culture for long. I moved and no longer have my fish or my barrels of daphnia but I still do have a 3/4 gallon jar that has some daphnia in it but they die off and then I get a population of other copapods, mostly ostrocods, for a while. then they die off and the daphnia come back. That's been going on now for about 15 years. I had is sealed for most of that time with no water changes. Frankly, it did better when I left it alone in a basement window.

    The water in it is a slightly yellowish green but I've never had an algae bloom in it and it never produces enough of anything to be usful for anything but looking at. I suppose if you were to grow green water in a seperate container and transfered it into the daphnia culture when doing water changes you could get a better population growth, You should probably mantain several greenwater cultures for each daphnia culture or use roti-rich, that stuff really worked for me, maybe even better then greenwater.

  4. #12

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    Quote Originally Posted by [b
    Quote[/b] ]and then I get a population of other copapods, mostly ostrocods, for a while
    OTHER copepods? neither daphnia nor ostracods are copepods. they're three different things.

    I think you can also feed daphnia yeast. I don't know how well that works though. You could try adding a little bit of fertilizer to get more algae.
    Talk sense to a fool and he calls you foolish-Euripides
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  5. #13

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    No. daphnia and ostrods aren't copepods my mistake.

    You can use yeast but it can get out of control easy. One problem is that if you use too much you just polluted the jug. You can also turn it into a yeast culture which will kill the daphnia. For a while I was trying to use yeast in aerated RO water fed with a little agar and sugar and drip some of it into the daphnia culture every couple of days. It was more of a mess then it was worth. I also tried just putting the yeast directly in the daphnia culture. Once in a while was fine but otherwise it fouled the culture.

    The problem with fertlizing the algae is if the algae bloom is too thick your daphnia will die of suffacation because algae consume O2 during the night. I did have OK luck using rabbit turds I got from another fish breeder who also had a rabbit along with the associated endless supply of rabbit crap, I used maybe half a dozen pellets per 10 gallons every few weeks. I was growing them in 20, 30 and 55 gallon containers so it wasn't so critcal. So you need to go for a balance which in smaller containers isn't always easy to get.

    The water can be green enough that you can't see into it more then a few inches but at that point it's easy for it to go over the edge and you lose the daphnia.

  6. #14

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    LOL! I have plenty of guineapig turds, but I don't really want to have underwater guineapig poop in my room :P
    Talk sense to a fool and he calls you foolish-Euripides
    wikipedia rocks! (except for species info)(CPers-add your vast knowledge of CPs to wikipedia&#33
    A person is smart. People are dumb, panicky, dangerous animals and you know it
    Get all the fools on your side and you can be elected to anything

  7. #15

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    LOL. Guinea pig turds would work too. Use only a few and it won't stink at all.

    I have an old aquaium book from the 30's, Maybe by Innes, I don't remember and it's in storage now. In it, they say to let you water sit in a sunny place and toss a few handfuls of hay and oats in the water and in a few weeks it'll ripen up and be perfect for water fleas

  8. #16
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    Check www.aquabid.com in the foods section they ussually have a two species of daphnia for sale.

    -Jc
    Heliamphora ... A genus that intrigues me and fills me with joy!

    -Jc
    Miami, Florida

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