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PostPosted: Jul 7th, '14, 09:11 
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This video shows some 1 day old tilapia fry in my 700 gallon ferrocement aquaponics tank. I dont try to breed tilapia anymore but when i see this i usually net a few out and put them in an aquarium. I will probably grow them out to fingerlings and use them as bass or crappie treats. "breeding tilapia" can be this easy.

The ferrocement system is still incomplete, I need to add more tanks and grow beds. Right now there is 1- 8'x6'x1' grow bed and a 700 gallon fish tank. In the fish tank are about ~7- adult tilpaia, ~10- 7-9" largemouth bass, ~10- .5-1.5lb channel catfish and 4or5 comet goldfish.



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PostPosted: Jul 7th, '14, 09:57 
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I'm surprised the bass and goldfish aren't having a field day munching away on those little guys.

Too bad we can't have them here :(

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PostPosted: Jul 7th, '14, 10:00 
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dunno about the gold fish but the bass are too big to notice right now or they would. The energy to catch a tilapia fry would cost more than the dinner. They will as the tilapia grow if they live long enough but all signs of past hatches have perished in under a week. I think what ends up happening is the catfish suck them up off the bottom at night. catfish are opportunistic feeders, often at night when prey is inactive or "sleeping"

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PostPosted: Jul 7th, '14, 12:45 
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Ho do you find the Ben and Glenn Aquazen pump?

I am looking at installing it into my system as well. What LPH air pump do you use?

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PostPosted: Jul 7th, '14, 15:50 
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I just based the design off the videos they post. it isnt magic.. it's only good for zero or low head height... and if it's better than a ecoplus water pump for electricity consumption it's barely. We can think (hope) the air pump has less moving parts and will last longer so maybe a net gain.

I am very clear at what i used in my indoor system.. an ecoplus 3 air pump (air lift pump) 35watt...

google says a ecoplius 3 is Single outlet 65 Liter/min

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PostPosted: Jul 8th, '14, 05:18 
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there were only a handful of fry left in the 700 gallon tank when i fed the fish today. i did see a couple of fry in the sump so possible they are getting sucked up by the plumbing and end up dying in the grow beds

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PostPosted: Jul 8th, '14, 19:39 
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If the tilapia fry are getting sucked through to the grow beds just put a bowl under the spigot in each grow bed. Some of the fry will probably wind up still in the bowl when you come out to check - I've saved a few small fish this way in the past where they were washed through a SLO. They might not be as lucky with a pump :dontknow:

Actually having a paint strainer tied over the spigot but resting in the bowl might work even better.


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PostPosted: Jul 9th, '14, 00:35 
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Or just get a floating fry basket, and keep them in there...

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PostPosted: Jul 9th, '14, 02:39 
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i was just saying what i think is happening, it's not really a problem, so i dont need a solution.

I scooped out 200-300 with a net and that's more than i need.

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PostPosted: Jul 15th, '14, 12:38 
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I got a decent picture of some of the fish today. For reference the tank is 6' in diameter and the PVC is 3".

The dark fish are LMB and channel catfish but it should be easy to tell which is which.
The white/orange fish are either tilapia or gold fish and it should be easy to tell which is which.





16 months ago in march 2013 the
LMB were 2"
Catfish were 4" fingerlings
and the tilapia were already 3-6"

The catfish and LMB spent the winter outside sometimes in cold conditions where they didnt move or eat for extended periods of time
Image

Meanwhile the tilapia spent the winter in a nice warm 100 gallon aquarium eating two square meals a day.

Attachment:
tilapia.jpg
tilapia.jpg [ 89.95 KiB | Viewed 2778 times ]



I just dont see why there is so much love for tilapia in aquaponics in non-tropical U.S.... When there are faster growing, better tasting, temperature tolerant native fish to chose from.

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Reproducing Sunfish (Bluegill/Redear/Crappie)
Feed training Crappie
Breeding tilapia


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PostPosted: Jul 15th, '14, 12:47 
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Ouch, that looks cold.

Is the system shut down during that sort of temperature? I thought the fish wouldn't survive when the top is iced over, and there is no water movement, and ammonia taken out. But they might be in semi hibernation during that time.

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PostPosted: Jul 15th, '14, 12:57 
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Yes! exactly, this is the beauty of native fish. They are equipped to handle your environment!

I just turn off the pumps when a cold front/freezing weather comes through. The freeze cant last for weeks or months, especially in a small ibc.. but a couple, three, four days like happens in my area is not usually a problem. I have gone through several winters with no fish deaths.

The fish in the video lived through that freeze. though i did have a pretty big fish kill when those pictures were taken last december. I have a freeze report thread viewtopic.php?f=2&t=19949 where i documented my losses

The fish are cold blooded and their metabolism slows down and they just sit on the bottom of the tank until it warms up. In this case, my tanks were probably overcrowded and since the ibc's were not insulated by the ground the bottom of the tanks froze ~2" thick which also froze some of the fish sitting on the bottom not moving.

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Reproducing Sunfish (Bluegill/Redear/Crappie)
Feed training Crappie
Breeding tilapia


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PostPosted: Oct 19th, '14, 16:11 
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it's not aquaponics so i wont post a new thread, but i converted my indoor/garage system to an aquaculture RAS to overwinter my tilapia.

The design is a 900 gallon pool i got on end of summer clearance at big lots for $30 and built 3 stage filtration. A game mesh filter -> MBBR -> Sand.


It's not complete and i may continue to tweak and modify it but it looks like it is working well for now.. a full tour in the youtube video.



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Reproducing Sunfish (Bluegill/Redear/Crappie)
Feed training Crappie
Breeding tilapia


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PostPosted: Oct 19th, '14, 16:45 
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looks good Brian, so you will have an indoor swimming pool during summer. ;)

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PostPosted: Oct 22nd, '14, 08:26 
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I am thinking maybe winter tilapia and summer trout

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