Cure for Blue Green Algae - Could this be??

Discussion in 'Plant Problems' started by shihr, Apr 24, 2013.

  1. shihr
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    shihr Administrator Staff Member

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    stumbled upon this vid. quite interesting.. wonder if it works. any volunteers?? hehe

    Blue Green Algae
     
  2. henk hugo
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    henk hugo Noob

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    Used extensively in koi ponds already. We will be importing a pellet form as well as a liquid extract for the next koi season.
     
  3. shan
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    shan Algae harvester

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    damn thats interesting. so where can we get organic barley or oats straw?
     
  4. tyronegenade
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    tyronegenade Specialist

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    Barley straw was debunked ages ago: http://www.clean-flo.com/algae-control/barley_straw_for_algae_control/

    If you want to kill BGA try methylene blue or acriflavine but it will just come back if the aquarium conditions are not ideal. That said, Barley straw does seem to be of some value in preventing algal outbreaks but has to go into the pond long before there is any algal bloom. Maybe because it takes time to get enough zooplankton going?

    PS. As not to appear unfair, there are studies suggesting that compounds from barley straw DO inhibit the growth of algae but do not kill it. Furthermore, these compounds are taken out of solution by activated carbon [http://link.springer.com/article/10.1007/BF02179781#page-1]. There are also results suggesting it could work for long-term algae inhibition in water reservoirs. But on the whole, the results are a mixed bag and this certainly isn't a magic bullet for algae: http://www4.agr.gc.ca/AAFC-AAC/display-afficher.do?id=1236287714868&lang=eng, http://ohioline.osu.edu/a-fact/0012.html, http://www.btny.purdue.edu/pubs/apm/apm-1-w.pdf.

    If there is such a magic barley straw bullet then the data must be supplied!
     
  5. sparkyweasel
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    sparkyweasel Algae harvester

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    The people debunking it are selling a rival solution, so not exactly independent. Also there are talking about water clarity, which suggests they are saying it doesn't reduce green water algae. But barley straw was originally advocated for reducing blanketweed in ponds, and the video linked in the OP is saying it reduces BGA (cyanobacteria). People report good results with blanketweed, but I haven't seen any scientific proof, just anecdotal evidence.
     
  6. henk hugo
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    henk hugo Noob

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  7. tyronegenade
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    tyronegenade Specialist

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    Yes, that's why I added more info in the PS. The link was just a nice synopsis of the problems, but, as you point out they are selling a rival product which is something of a conflict of interest.''

    Henk, the product interests me for other reasons than algae. Can you get more info such as a chemical analysis of the extract? I would also like to see the experimental data for testing the compound. What comes across from the various experiments in journals is that the results obtained are heavily influenced by the way the experiment was performed. For instance, a UV filter will obliterate the phenolic compounds just as surely as charcoal will remove it. Sunlight will also destroy the compounds (which is why they advise a dosing schedule).

    It is worth reemphasizing that the scientific data shows that the barley straw does NOT kill aglae, it stops their growth. As such, it is unlikely to make a green pond go clear but will help keep a clear pond algae free (maybe, see the references in my previous post). This, coupled with its incompatibility with activated carbon, means it will probably be useless to us who grow planted aquariums unless (like me) you remove carbon from your filter---but then your tank goes yellow.
     

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