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PostPosted: Sep 26th, '10, 17:45 
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I've been thinking for a while that it might be a good thing to set up three single bed systems at the shop to trial different aspects of aquaponics. Of course it would be a bit of an investment so I'd like to get others ideas about different trials we could run, to see whether it would really be worth investing three systems to do this..

Some ideas I have come up with so far:

Trial 1 - Flooding/draining style

One system on a standpipe timer style like we do at the moment.
One system on an affnan siphon with a full time pump.
One system running full time constantly flooded.
Feed the same amount to the same fish in each system, plant the same plants, record growth and water quality over a growing season.

Trial 2 - Feed comparisons

Run the three different systems on different feeds. Same plants, same fish, same system set up, same feed rates, record plant growth and water quality.

Anyone have any other ideas of comparison Trials we could run? We have the test kits, dissolved oxygen meter, the fish, the seeds, seedlings and the systems.

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PostPosted: Sep 26th, '10, 17:57 
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EB,

For Trial 1 couldn't you just use one of your three bed kits you already have running with the different style on each grow bed with the same plants? That way they are all getting the same nutrients etc because its the same water. Prob just have to use 1 pump for the timed setup and one running continuous for both the siphon and constant flood systems.


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PostPosted: Sep 26th, '10, 18:20 
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Trial 1 would be interesting. My new system with two byap gb's and both with affnan syphons is giving different growth rates in the two beds due to the syphons acting differently.
The bed showing the best growth is starting and stopping quickly, and the other starts well but takes an age to stop, so the bed effectively is dry for a long time.
Got brocolli seedlings from the same punnet in each bed and the difference in growth is easy to see

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PostPosted: Sep 26th, '10, 18:29 
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Maybe show the effects of removing the solids from a system.

I'd like to see the difference the amount of GB(media) has on the same system. Give people an idea if an extra GB could help remove some stress.

Adding extra forms of proccessing waste to increase the amount of fish a system can grow out. Also how many mature fish can be kept on a lower feed ratio and what effect that has on plant growth.

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PostPosted: Sep 26th, '10, 19:39 
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Different size fish tanks -cause people keep saying the fish will onl;y grow to the size of the tank. :shock: I personally reckons it relates to how much feed they get.

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PostPosted: Sep 26th, '10, 19:50 
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yep im with you on that Faye
iv got a small pond and my koi are about 36/38cm long and still growing


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PostPosted: Sep 26th, '10, 20:01 
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Nothing to do with the experiments but EB at 5.45pm you will still surfing the net, so is that why we did not see you at the show?? :D

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PostPosted: Sep 26th, '10, 22:40 
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I know it would be difficult but I would be interested to see the effects of PH on the systems
Say 6, 7 and 8 ph levels.


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PostPosted: Sep 26th, '10, 22:57 
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Sounds like a very informative idea there EB. Hard to say if it will really be worth the investment to you directly but running some more closely controlled experiments side by side with matching systems could provide some interesting results. Of course with only one sample of each part of the test, it may not be the most definitive set of experiments out there but it should still teach us all something.

You probably don't need to go searching for too many different experiments to run yet since you should probably run the first trial for a year at least before going on to the next.

I agree that comparing the timed flood and drain to the siphon to the constant flood could all be done on a single system so that you know the beds are all getting the same water. This probably wouldn't require too big a fish tank as only two beds are flooding/draining and the constant flood won't be affecting the water level unless you pull the stand pipe out.

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PostPosted: Sep 26th, '10, 23:16 
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... Perhaps a trial of GB media depths? 1 X 150mm, 1 X 225mm and 1 X 300mm.

Just for Garys sake and that of the 'Fundamentalists'... :wink:


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PostPosted: Sep 26th, '10, 23:19 
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+1 for the pre-GB solids removal/mechanical filtration!


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PostPosted: Sep 27th, '10, 00:20 
faye wrote:
Different size fish tanks -cause people keep saying the fish will onl;y grow to the size of the tank. :shock: I personally reckons it relates to how much feed they get.

There's obviously some truth to that proposition Faye... ever seen a sardine that's bigger than the can... huh...


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PostPosted: Sep 27th, '10, 06:20 
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Well one thing that has been discussed or implemented recently by a number of member is the venturi aeration. Different members with different styles/methods, since there is a dissolved oxygen meter, all you need a flowmeter to make sure the flow rates are equal, some guidelines set, and you can test a few different styles to see if they really make a difference to dissolved oxygen when you see more fast flowing bubbles.

Also maybe the effects of having a whirlpool effect for fishes like trout. Improved growth rates??

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PostPosted: Sep 27th, '10, 06:52 
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Off all these systems and ideas it would be worth measuring the output in vegies on a weight and value basis. That way, when people start balking at the initial investment there would be some data to show them just how much it would save. Of course power and feed costs have to be recorded as well.

Would be nice to have some hard data in this area.

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PostPosted: Sep 27th, '10, 07:55 
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Nice Idea EB


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