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PostPosted: Apr 10th, '09, 19:54 
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Looks great, but you seem to be skipping over alot of questions and details Joel??? Do I have to come over there and see it in person? If you are reluctant to talk about the costs, are you able to give an estimate on how long a system like that would take to pay itself off? (I'm sure you've done the figures)

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PostPosted: Apr 10th, '09, 21:00 
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Nice to see you worked through you're thoughts there Rupe. :) The colour of the liner makes very little difference except for the small strips on the top edge of the trough sides. Troughs are 300 deep, but water depth is generally at about 250-280. There's probably a lot of room for experimenting with depth, and yeah, Friendly's have gone very shallow with one of their newer systems. I do like having a bit of depth though, larger water body means more stable system. We've had really warm weather for a few days now but the water temps are still right down, trout are happy.

Yep....... You'll just have to come over and look KE.. :wink:

We've already changed an aspect of the system. The next system we build will have the channel directly on the ground rather than partially dug in, and the trough will be built of steel, a bit more expensive for materials, but more feasible than earthworks.

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PostPosted: Apr 10th, '09, 22:01 
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Seriously, this cant be healthy.
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Another point, having the trough edge above the ground also protects you from water running into it overground during a heavy rain. Around here I would probably dig a 300 mm trough into the ground about 150 mm and frame out the top 150 mm which would give something to attach the liner to around the top edge. (well that is basically what I did do for the on the ground monster grow bed with gravel. Should be even easier with just water.)

Bonus on the DWC raft culture troughs, You can probably get away with using much lighter weight liner that what you can using gravel.

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PostPosted: Apr 12th, '09, 19:16 
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This week we put up some wind protection.. We had very strong winds today so I went down to see how it was holding up and it's all good so far..
Attachment:
P4120031 (Medium).JPG
P4120031 (Medium).JPG [ 78.95 KiB | Viewed 4892 times ]


In this picture you can see that the channel on the right has had more growth than the channel on the left. Right channel has been planted for about a week longer. We don;t really expect much growth as yet, there are still very limited nutrients and the trout aren;t being fed ATM as we wait for the ammonia levels to drop, looks like they have turned and are on their way down so we'll be starting to pump the feed into them soon.

Attachment:
P4120032 (Medium).JPG
P4120032 (Medium).JPG [ 83.13 KiB | Viewed 4889 times ]


And yes there are some lettuce missing from a raft, we've pinched them to take to garden week and we'll put them back later.

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PostPosted: Apr 12th, '09, 20:16 
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FARKEN WOW! :shock:

That'll learn me from taking a break! missed out on any insider info!

WOW again.

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PostPosted: Apr 12th, '09, 20:18 
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looks magic. Will be nterested to see if having it out in the open helps with any bug issues. We found mass plating like that of obne typoe of plat leads to mass pest invasions.

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PostPosted: Apr 12th, '09, 20:48 
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steve wrote:
FARKEN WOW! :shock:

That'll learn me from taking a break! missed out on any insider info!

WOW again.


Gotta keep your eye on the ball... :)

I'm hoping that insect pests wont be a problem, we have a pest management plan involving regular spraying of dipel, use of yellow sticky cards and potassium bicarbonate for disease. We won't be mucking around when there's a sign of any problems.

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PostPosted: Apr 12th, '09, 21:55 
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earthbound wrote:
I do like having a bit of depth though, larger water body means more stable system. We've had really warm weather for a few days now but the water temps are still right down, trout are happy.


Interesting. Having the growbeds dug into the ground will really increase the effective thermal mass. When you add in the effects of the polystyrene as an insulator/reflector and the evaporative cooling effects of extreme aeration I would think the system temperature would stay near your local dewpoint. In a dry climate you might be looking at 10degC(20degF) below average daily and monthly temperatures. While costs would kill you if you tried to warm the water, might trout survive year-round? Very nice.

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PostPosted: Apr 12th, '09, 21:59 
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Seriously, this cant be healthy.
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So how is the solids digester doing? How much air are you having to pump into it?

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PostPosted: Apr 13th, '09, 02:30 
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Joel, very impressive.

Thanks for sharing.

How thick is your liner material?


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PostPosted: Apr 13th, '09, 10:18 
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Hi Joel I don't have any questions I just wanted to say it looks nice. 8)

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PostPosted: Apr 13th, '09, 13:54 
The wind protection is a good idea Joel...

From the photos it looks like there's only about 150mm of the trough above ground... are you likely to get any runoff into the troughs during really heavy rains....

Or would that sandy stuff you guys call "soil" just soak it up like a sponge???


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PostPosted: Apr 13th, '09, 14:23 
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Had a bit of a scare when I found hundreds of these in the solids

tank.
Attachment:
Midge_Larvae1.jpg
Midge_Larvae1.jpg [ 32.11 KiB | Viewed 4672 times ]


I wondered if it was a problem for the fish, but it turns out that it's midge larvae, they break down solids and fish love to eat them. I tipped some into the fish tank and the trout went crazy. They are already through out the whole system in the grow troughs, I guess this is one of the joys of our location being amongst many lakes and swamps in the area.

We are trialling two different liners, one a rubberized and the other is a layered thinner liner, we went pretty thick, about 1.5mm I think for memory.

Solids digester is working ok so far, but there's hardly any load on it yet, probably have close to 30 litres a minute of air in there at the moment, with room to at least double that as the load increases if it;s needed.

Yep, temperature has really surprised me, I'll be very keen to see how it performs coming into next summer.

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PostPosted: Apr 13th, '09, 14:25 
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Soil??????? Here in Perth??????? :lol:

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PostPosted: Apr 13th, '09, 16:35 
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Looks to be going well. I find there is a lot of little guys trying to eat the solids once they are seperated.
Even seen your new system springing up all over the internet. They can't seem to get the basics right. Might have to break out the crayons for a system rundown once you have the details ready. :mrgreen:

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