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Thread: Quantifying Biomass

  1. #21
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    Garf, is that 100 sq in representative of one side of the screen, or did you harvest both sides?

    For purposes of this thread/process, I think we need to standardize on one, I opt for surface area, because it allows for single side cleanings and horizontal, etc

  2. #22
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    Yes Floyd, gonna keep to one sided cleanings. It seems to give stronger attachment than when I was letting both sides get thick.

  3. #23
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    Quote Originally Posted by Floyd R Turbo View Post
    Harvested the scrubber from the Doc's tank today - 17 days, 100g even

    100g / 17d = 5.88 / 24 = 0.245g/d/sqin, /48 = 1.23g/d/sqin
    This should have read 0.123 g/d/sqin...just caught that

  4. #24
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    Dry weight test completed;

    Container weight;


    Squeezed mass and container weight;


    Dried algae and container weight (3 hours @ 110C);


    calculation resulting in a dry weight ratio of 5.25% of squeezed weight

  5. #25
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    To add a bit of relevance to the dry weight status, Randy F wrote this a while ago;
    http://reefkeeping.com/issues/2006-09/rhf/index.php#21

    For example, Caulerpa racemosa collected off Hawaii contains about 0.08 % phosphorus by dry weight and 5.6% nitrogen. Harvesting 10 grams (dry weight) of this macroalgae from an aquarium would be the equivalent of removing 24 mg of phosphate from the water column. That amount is the equivalent of reducing the phosphate concentration from 0.2 ppm to 0.1 ppm in a 67-gallon aquarium. All of the other species tested gave similar results (plus or minus a factor of two). Interestingly, using the same paper's nitrogen data, this would also be equivalent to reducing the nitrate content by 2.5 grams, or 10 ppm in that same 67-gallon aquarium.
    Obviously these studies were on macros, sorry for that, there's not a lot of info on filamentous stuff that I could find. Perhaps SM has got some research hidden away somewhere.

    Note the plus or minus a factor of two reference. This is quite a large range depending upon species.

  6. #26
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    Harvested the scrubber from the Doc's tank yesterday (6/11/13) - 15 days growth, 101g (311g wet)

    101g / 15d = 6.73 / 48 = 0.140g/d/sqin

    N=0, maybe 0.1 or 0.05

    P=0.01

    Both tested I think Sunday-ish.

  7. #27

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    Garf, thanks for this article http://reefkeeping.com/issues/2006-09/rhf/index.php#21

    Not seen it put into numbers like that before.

  8. #28
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    Garf got banned. You can find him on my site if you wish to contact him. Not even sure he'll see this post.

  9. #29

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    Really?! What for? What's your site? Can PM me if either can't be mentioned in thread. Cheers

  10. #30
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    Click my sig links to go to my site

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