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Posted by d
on 11/3/2009, 12:18 pm
216.41.249.164
JR, you posted this, and rather than put it on the tail of the arugument, I thought I would give it its own thread
"Consider WHY semi open systems produce better results. Consider WHy lower stocked ponds produce better results. Consider why other hobbies like marine keeping have mmoved away from closed containers into open sumps and trickle applications. The secret is in those observations."
First, there are many levels of the hobby. Those like Henty, Lee, etc are raising fish for a purpose, to show. They are willing to spend what it takes to have their system tweeked to the max when it comes to maximizing the potential of the fish in their charge.
Then there are others, while not interested in showing, will try to give the Koi a very satisfactory place. These crowd their pond a bit. Some will morph into show Koi, but many will not. They are interested in keeping good fish well.
Then the third group I will call the average pond owner. Not the crap collection systems that landscapers install, but actually a pond designed for Koi. Pretty much always overstocked, and some of the offspring are always allowed to continue living in the pond every year to "just see what happens".
The needs of the Koi are the same in each pond. But what the pond owner in willing to spend or do for those fish is what varries.
Now, as to your question above, the missing link is Oxygen. I have read several articles that mention that roughly 90% of the O2 demand of the pond is not the fish, but the bacteria. Submerged systems rely on disolved O2 while trickle filters have an endless supply of O2.
Something I have noticed on several systems that have settlement tnaks, if I place a TT on the settlement chamber close to where the pumps draw their water that goes to the bead filter, the bead filter is supercharged if you will. The water is almost saturated with O2 as it enters the filter.
d
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