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Thread: Recipe for a freshwater Plankton Culture

  1. #1
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    Default Recipe for a freshwater Plankton Culture

    There is a plankton producing schedule that works. Here is a loose guide. If you start on the first day of the month you will always know where you are up to by looking at the calendar.


    FERTILISATION SCHEDULE FOR PLANKTON CULTURE

    Fill pond make sure hardness and alkalinity are each over 50ppm
    Increase alkalinity with potassium bicarbonate 20 gm/ M3 to increase 10 ppm.
    Increase hardness with a mixture of 1/1 epsom salts with calcium chloride, 20 gm per M3 will raise hardness approx 10 ppm.

    Day 1 add inorganic fertiliser ((currently I use Aquasol at 2 ppm)
    (Optional - add some dry soil from a nearby dry stream or billabong)


    Day 3 add organic fertiliser @ 50 ppm (only add 6 ppm if fish present)
    (currently I use dynamic lifter)

    Day 12 add inorganic fertiliser as day 1

    Day 14 start harvesting plankton or stock with fish

    Day 17 add organic fertiliser @ 6 ppm

    Day 22 add inorganic fertiliser as per day 1

    Day 24 add organic fertiliser @ 6 ppm

    Day 27 add organic fertiliser @ 6 ppm

    Day 31 add organic fertiliser @ 6 ppm


    This is not a strict schedule and may need to be modified depending on the following factors:

    1. A secchi depth of less than 40 cm will negate the need for later inorganic fertiliser. A secchi depth of over 70 cm will require an addition of fertiliser. (try 2ppm inorganic)
    2. An occurrence of filament algae will negate the need for later inorganic fertiliser.
    3. Low oxygen levels will negate the need for later applications of organic fertiliser
    4. For a pond with life that is established omit the 50 ppm organic fert addition and replace with 6 ppm organic on day three.

    Here are a couple of photos of plankton from various cultures from my ponds. The pod shrimp was about 10mm long and way too big for your average small fish to eat.
    Attached Images Attached Images
    Last edited by Dave; 06-11-07 at 05:36 PM. Reason: cant spell secchi

  2. #2
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    Default

    Thanks Dave

    Sticky please admin!

  3. #3
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    Default

    Can someone explain to me what is meant by "sicce"?

    Quote Originally Posted by Dave View Post
    1. A sicce depth of less than 40 cm will negate the need for later inorganic fertiliser. A sicce depth of over 70 cm will require an addition of fertiliser. (try 2ppm inorganic)
    Thanks
    Ben
    What The pseudomugil Furcatus was that!?

  4. #4
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    Default

    I think Dave means Secchi Depth. A standard non-electronic measure of water turbidity.

  5. #5
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    Default

    I'd say that's "Bingo" Grubarooni
    Cheers,

    Rufus


    "I completely lost it. Well, okay, that sounded more awesome than what I really did, which was yell. And by yelling I mean sending a bunch of TEXT MESSAGES ALL IN CAPS!"

  6. #6
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    Default

    Thanks for pointing out my bad spelling. I have fixed it.

    Have a look at http://www.angfa.org.au/secchi.html Looks like I spelled it correctly there. Anybody who want s make one. You can read the info about secchi discs from the links after that photo story.

    Cheers
    Dave

  7. #7
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    Dave - Can you add the fertilisers when fish are in the pond or tub? I have moved some werneri into a new tub. I'd like to get it nice and green for them. I should have done this before hand but didn't!

  8. #8
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    Hello Cnway,

    There is a part there where you only add 6ppm instead of 50ppm when there are fish in there. Your nose should tell you if everything is OK. I put a couple of pair of whatever fish in a 5 ton plankton culture. Usually there is fry pretty quickly. Green water is usually very healthy both for DO and nitrogen levels.

    Once you start feeding other foods you should stop the fertilisers.

    Cheers
    Dave

  9. #9
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    Thanks Dave, I read that part and missed the fish section!

    Also is there a simply way to work out the ppm? My maths is rather poor and I'm getting a headache trying to work out what 50ppm of a 180 litre tub would be!

    Is there a basic formula you use or something?

    Thanks again,

    Conway

  10. #10
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    Hi Conway,

    1ppm = 1mg per litre.

    I work out how much for 1 litre. Then mulitiply by the litre capacity of the tank.

    Say you need 10ppm of something. In 1 litre you need 10mg. For 180 litres it is 10 x 180 = 1800mg. Which is 1.8 grams.

    50ppm in 180 litres is 50 x 180 = 9000mg. Which is 9 grams.

    So we can see that if you multiply litres of tank water by ppm required, we get the weight of fert you need in milligrams.

    I have a spreadsheet for working things like this out. If anyone wants a copy you're welcome to PM me.

    Hope that helps.

    Sorry to threadjack Dave
    Regards

    Matt

  11. #11
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    Thumbs up Thanks guys

    I just read this recipie in "ANGFA NEWS" .

    Was wondering how easy it was to do the maths to put it all into simple terms for myself

    Thanks for sharing.
    Good luck with the werneri Conway, I will be doing the same too.

    Graeme
    Read this very helpful thread on BSS .
    No pictures on your BSS advert? Then be prepared for it to be deleted ( read the rules )

  12. #12
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    Yeah, I have been meaning to do it for awhile. The ANGFA article reminded me. Although most of my tubs outdoors have gone nice and green. I think it is from the potting mix for my plants. All the fertilzers in there do the trick.

    I am glad I am not the only one who found the maths tricky! hehe

    The werneri are doing great Graeme. Ever since i moved them to an outdoor tub with greenwater. There is always new fry, and the older ones have grown up so much better then when I had them indoors.

    The tub is a bit small I think, 60 litres. I have started to move them into the 180 litre tub.

  13. #13
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    There is no strict science to these cultures, they can last for ages or crash quite quickly. The guys that manipulate the prawn pond are alway amazed at how different two ponds can be that are side by side with the same management regime. The good pond operators have some sort of 6th sense and are valued by managemet.

    Matt, I would like the spreadsheet please. aqua.green@bigpond.com

    Attached is the latest brew from this week.

    Cheers
    Dave
    Attached Images Attached Images

  14. #14
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    No worries Dave I'll send you the spreadsheet now.

    I've got a few of them. I should offer them in a thread of my own.
    Regards

    Matt

  15. #15
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    Default

    they look like snails to me...

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