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Kaldness disc analysis

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Kaldness disc analysis

Post by alank on Sat Oct 01, 2011 8:41 am

I am running 33000 l/h through a bio tank after a rotary drum filter. The filter gets absolutely nothing but clear water containing ammonia, nitrite, nitrate etc etc.

The bio tank is 750 liters in total volume, I have 200 liters of K1 and discs in there so that should leave 550 liters of water. The flow rate is 33000 l/h and there is approx 120 liters of air circulating the plastic media and mixing the water. The flow rate looks on paper to be excessive through only 550 liters of water in the tank, ie its not in there for very long, absolutely no dwell time.

I looked at one of the discs under a microscope expecting to see a very sparse population of rotifers. My logic was, the water is rushing through, the K1 is getting pummelled against itself by air and water movement so the good buddies will be getting knocked off big time.

This is what I found:


I would say that is a fairly healthy population. I did a similar thing last year and found this:


A big difference in numbers on there. I know there are many other types of microscopic life on there and that are required in a bio filter.

What I need is a reasonably scientific test to see if my high flow rates affect population.

I have another filter which has 15000 l/h through 200 liters of K1/discs on the same pond, water is taken from my old skimmer which is now submerged 50mm below the pond surface, it is effectively a high water take off. The water contains fish waste in small quantities but I have no way of knowing how much.

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Re: Kaldness disc analysis

Post by Admin on Sat Oct 01, 2011 9:24 am

Rotifer Population is related to `Balance` Alan ...

Namely during Pond Immaturity .. an `over-abundance`ie Population Explosion in certain species has been demonstrated ... which diminish over time..
You have a sweet colonization of Philodina there as did I until the system `Matured` sufficiently whereupon multiple species ensued....

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Re: Kaldness disc analysis

Post by DaveB on Sat Oct 01, 2011 7:28 pm

great Videos alan. What is the magnification please?

best Regards dave

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Re: Kaldness disc analysis

Post by Admin on Sat Oct 01, 2011 11:30 pm

Great Clips Alan.

A Nice Article on Rotifer`s here Arrow

http://www.ucmp.berkeley.edu/phyla/rotifera/rotifera.html

Bdelloid Rotifer Philodina and sister species have no `Male` Gender members and reproduce by a process known as Parthenogenesis Shocked

http://scienceblogs.com/notrocketscience/2009/09/bdelloid_rotifers_-_80_million_years_without_sex.php


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Re: Kaldness disc analysis

Post by HAN on Sun Oct 02, 2011 2:45 am

I`d like one of those microscopes myself, my eyesight aint what it used to be Rolling Eyes
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Re: Kaldness disc analysis

Post by alank on Sun Oct 02, 2011 7:09 am

DaveB wrote:great Videos alan. What is the magnification please?

best Regards dave


Hi Dave, they were taken with the 10x lens. The scope has 4x, 10x and 40x and the scope multiplies it by 10 I think. You can then zoom in on the screen.

A couple more I did last year, the first one I zoom in, again on 100x magnification, ie 10x10.




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Re: Kaldness disc analysis

Post by alank on Sun Oct 02, 2011 7:21 am

Various clips of wildlife scraped from the side of my skimmer. I think there are a few midge lavae rather than flukes.






>

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Re: Kaldness disc analysis

Post by Admin on Sun Oct 02, 2011 7:41 am

They are ALL Philodina Alan with possibly one exception ...

Look at her `red eyes` in this pic > http://www.sciencephoto.com/media/149313/view

The Nematode in your clip here > http://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/wimsmall/worm.html

The long stick like bacteria look like one of the Cyanobacteria species and a lone Tetrahymena was in one clip ...

Fab footage Sweetie ... Very Happy I used to scope Pond Life for hours Very Happy

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