Aquaponics Digest - Mon 08/02/99
Message 1: Re: A Copy
from "Tunji Ladoja"
Message 2: Fwd. Aquaculture Resource, was Re: A Copy
from S & S Aqua Farm
Message 3: RE: A Copy
from "Ronald W. Brooks"
Message 4: Re: A Copy
from "Mark Brotman"
Message 5: Re: A Copy
from "Tunji Ladoja"
Message 6: Tunji's system
from "Mark Brotman"
Message 7: RE: A Copy
from "Ronald W. Brooks"
Message 8: Re: A Copy
from "Jim Sealy Jr."
Message 9: Polyfilm greenhouses
from "Deborah J. Brister"
Message 10: Re: Polyfilm greenhouses
from "Jim Sealy Jr."
Message 11: Tunji
from "Mark Brotman"
Message 12: Re: Tunji
from Adriana Gutierrez & Dennis LaGatta
Message 13: Re: Sprayers
from "William Brown"
Message 14: Plastic Trays
from dreadlox@cwjamaica.com (michael kent barnett)
Message 15: Re: Greenhouse plans
from dreadlox@cwjamaica.com (michael kent barnett)
Message 16: Tomatoes in pop bottles
from dreadlox@cwjamaica.com (michael kent barnett)
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Subject: Re: A Copy
From: "Tunji Ladoja"
Date: Mon, 2 Aug 1999 12:01:22 +0100
Hi There,
I am trying to set up a fish farm in West Africa and would like to know what
kind of biofilter sizes (surface area) I need for a ten thousand gallon
tank holding 11000 pounds of fish with a flow rate of about 170 gallons a
minute. The fish I will be stocking is tilapia.
Regards
Tunji Ladoja
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Subject: Fwd. Aquaculture Resource, was Re: A Copy
From: S & S Aqua Farm
Date: Mon, 02 Aug 1999 06:54:33 -0500
>"Nilo Lancita" wrote:
>>I am interested to own a copy of Home Aquaculture, A Guide To Backyard Fish
>Farming.
>>
>>Please send info and method of payment to nilancita@centtel.com
>>
>>Thanks.
\
Here's the contact info we have from the author:
Received this post from Steve Van Gorder
>From: altaqua@ptd.net (Steve Van Gorder)
>Subject: aquaculture
>
>Dear Paula:
>
>Dr. Jim Rakocy suggested that I contact you. I publish the quarterly
>Alternative Aquaculture NETWORK Newsletter, and wrote the book HOME
>AQUACULTURE, each of which provide a great deal of information on
>small-scale and commercial aquaculture and aquaponics. This literature is
>available through the non-profit Alternative Aquaculture Association. Jim
>thought that many of those communicating through your service would be
>interested in this availability.
>
and this contact information for those who are interested in buying the book
and putting the money where the author wants it:
>To: snsaquasys@townsqr.com
>From: altaqua@ptd.net (Steve Van Gorder)
>Subject: resource
>
>Paula:
>
>Thank you for your welcome. I appreciate the posting of information. I am
>working on a website for future access to information about the NETWORK
>newsletter and Home Aquacututre book, as well as for educational systems
>and commercial aquaculture information. I will provide that infor as soon
>as it is ready.
>
>For now, information is available through:
>
>The Alternative Aquaculture Association
>P.O. Box 109
>Breinigsville, PA 18031
>To: snsaquasys@townsqr.com
>From: altaqua@ptd.net (Steve Van Gorder)
>Subject: Home Aquaculture
>
>Dear Paula:
>
>Thank you for your inquiry about the pricing of the book Home Aquaculture.
For anyone else, I am
>providing the following information about pricing:
>
>
>Membership in the Alternative Aquaculture Association
>w/ subscription to the quarterly NETWORK Newsletter - $14.00
>
>Home Aquaculture: A Guide to Backyard Fish Farming - $18.95
>
>NETWORK Subscription and Home Aquaculture (best deal) - $28.00
>
>
>Again, thank you very much, and I look forward to our continued communication.
>
>All the best
>
>Steve
S&S Aqua Farm, 8386 County Road 8820, West Plains, MO 65775 417-256-5124
Web page http://www.townsqr.com/snsaqua/
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Subject: RE: A Copy
From: "Ronald W. Brooks"
Date: Mon, 2 Aug 1999 09:35:35 -0400
-> Behalf Of Tunji LadojaSent: Monday, August 02, 1999 7:01 AM
-> To: aquaponics@townsqr.com
-> Subject: Re: A Copy
->
->
-> Hi There,
->
-> I am trying to set up a fish farm in West Africa and would like
-> to know what
-> kind of biofilter sizes (surface area) I need for a ten thousand gallon
-> tank holding 11000 pounds of fish with a flow rate of about 170 gallons a
-> minute. The fish I will be stocking is tilapia.
->
-> Regards
->
-> Tunji Ladoja
->
->
There area few factors to be considered before any advice is given.
Are your going to prefilter to allow the solids to settle out ?
I am assuming you are designing a raceway ?
What type of media are you considering to use in the biofilter ?
As cheap as plastic drain tile or as expensive as special bio-balls ?
Plus it looks like you have exceeded 1 lb. of fish for every gallon of water
in the most intensive type recirculating system. Is there a reason why ?
Mark come jump in here
Ron
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Subject: Re: A Copy
From: "Mark Brotman"
Date: Mon, 02 Aug 1999 10:56:39 -0400
Thanks Ron, I'd be glad to have a go:
Tunji,
Redirc systems typically have two stages filters. The first, as Ron pointed
out, is Solids Removal. Without this, all that fecal matter and (hopefully not
too much) uneaten feed will clog up your second stage of filtration, the
Biofilter. For taking out the solids, you can use passive means like passing it
through bird/orchard netting or use an appropriately-sized container gravity to
settle it out. Biofilters are typically calculated at 3-4 square feet of
surface area for every pound of fish you will ultimately have at harvest.
Always go conservative on your construction plans. Remember also that the
biofilter will need oxygen to their job. Keeping the Dissolved Oxygen levels at
5 or above is generally a good idea. I would also like to reinforce Ron's point
about your stocking density-- "intensive" for many people starts at about 1/2 lb
per gallon. The most heavily stocked grow-out I've ever seen was using a huge
flow of water diverted from a river in Java-- they were doing, as I recall,
about a kilo per gallon(!). They had an enormously abundant supply of water and
no energy costs. Take it one step at a time and walk before you try to run.
Good luck and keep us posted!
Mark Brotman
Aquaculturist
CropKing
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Subject: Re: A Copy
From: "Tunji Ladoja"
Date: Mon, 2 Aug 1999 15:48:53 +0100
Thanks a lot for the information guys,
I intend to prefilter out solids before biological filtration. I am trying
to figure out what kind of filter to use and what the design criteria for
choosing filter media are. I will be stocking about 1.1 pound of fish per
gallon of water but I will not rech this kind of density for another six
months. Is the figure of 3-4 square feet surface area per pound of fish
conservative?
regards
Tunji Ladoja
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Subject: Tunji's system
From: "Mark Brotman"
Date: Mon, 02 Aug 1999 12:10:15 -0400
Tunji,
3 sq ft/lb fish in a warm water system should do you just fine. You may want to
go higher for the added insurance-- more than 4 might be over doing, though.
Media should be non-rotting, such as plastics. Possibilities include catalog
items made for the purpose, plastic drain tile, six-pack holders from cans of
soda, chopped pvc pipe, etc.. or whatever your local resources may yield. Needs
to have an open structure for water to pass through, so cup-shapes are out.
Put you media into a concrete box made for the purpose, a series of plastic 55
gallon drums, old bathtubs, or whatever else is handy; cover the structure to
limit algae growth as much as possible. Use at least a 3" pipe to transport the
water to maintain flow between rearing and filtration tanks. 1.1 lbs per
gallons is definitely do-able; just keep a close eye on nitrogen levels.
Mark Brotman
Aquaculturist
CropKing
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Subject: RE: A Copy
From: "Ronald W. Brooks"
Date: Mon, 2 Aug 1999 11:17:05 -0400
Boy I am very nervous about this. If any little interruption happens to your
filtration or oxygenation you are going to end up with ten thousand very
dead fish. I have heard of 1 farm that Packs the fish in at 1lb. per gallon
but I would not be comfortable with the automation and equipment required.
If any thing breaks they loose the whole tank. Not to mention the constant
"babying of the system"
Ron
The One Who Walks Two Path
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Subject: Re: A Copy
From: "Jim Sealy Jr."
Date: Mon, 02 Aug 1999 14:52:57 -0500
The big question: Is this going to be a flow through system or recirc?
If it's flow through, and you have a very secure supply of water, I'd go
with an
oversized marsh style filtration system and don't worry too much. Over the
last year
I've had very good luck with this practice. All I am trying to do is keep
the excess
nitrogen out of the local stream rather than trying to build a fail-safe recirc
system.
On the other hand, if you're building recirc, then I'd say double everything
in the
system or else you're looking at a _big_ potential problem which could stem from
anything going wrong with your bacteria, your mechanicals (pumps, aeration,
excess
feed, etc.) I've had all of the above happen any number of times, though I had
back-up systems and was using good commercial equipment. Bearings can and
will fail
in anything mechanical sooner or later. Brushes wear out unexpectedly. Automatic
feeders go haywire and overdose you fish with feed and suddenly your chemical
balance goes off the scale. For this reason we run 2 of everything all the
time, and
keep a back-up sitting in the shop ready to back-up the back-up.
Tunji Ladoja wrote:
>
> Hi There,
>
> I am trying to set up a fish farm in West Africa and would like to know what
> kind of biofilter sizes (surface area) I need for a ten thousand gallon
> tank holding 11000 pounds of fish with a flow rate of about 170 gallons a
> minute. The fish I will be stocking is tilapia.
>
> Regards
>
> Tunji Ladoja
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Subject: Polyfilm greenhouses
From: "Deborah J. Brister"
Date: Mon, 2 Aug 1999 15:10:44 -0500
Hello all,
I have a question for those of you who have aquaculture tanks located in =
polyfilm covered greenhouses. Have any of you experienced problems with =
predators such as raccoons actually ripping open the polyfilm and =
getting inside?
Deborah Brister
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Subject: Re: Polyfilm greenhouses
From: "Jim Sealy Jr."
Date: Mon, 02 Aug 1999 15:14:23 -0500
Yes.
Get a dog who likes to watch fish, but hates water, cats and raccoons.
He'll
also save you a lot of grief over missing tomatoes and such from those pesky 2
legged predators. Someone once asked me if my dog would bite. I said I certainly
hope so since he was a good dog and I'd hate to replace him.
Jim
I doesn't live at my greenhouse. It just feels like it.
"Deborah J. Brister" wrote:
>
> Hello all,
> I have a question for those of you who have aquaculture tanks located in
polyfilm covered greenhouses. Have any of you experienced problems with
predators such as raccoons actually ripping open the polyfilm and getting
inside?
>
> Deborah Brister
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| Message 11 |
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Subject: Tunji
From: "Mark Brotman"
Date: Mon, 02 Aug 1999 17:45:47 -0400
Tunji, read carefully what Jim is saying. Redundancy and back up everything
are very
important in a recirc system. Everything mechanical can and will breakdown
at some
point. Think about what your crop is worth to you if you lose it the day before
harvest, and then consider how cheap the insurance of back up equipment, warning
systems, etc., is. 1.1 lbs/gallon is do-able, but you would likely be
better off
stocking at a lower density (say, half that) and consider it "training
wheels" if you've
never done this before.
Mark
Jim Sealy Jr. wrote:
> The big question: Is this going to be a flow through system or recirc?
>
> If it's flow through, and you have a very secure supply of water, I'd go
with an
> oversized marsh style filtration system and don't worry too much. Over the
last year
> I've had very good luck with this practice. All I am trying to do is keep
the excess
> nitrogen out of the local stream rather than trying to build a fail-safe
recirc
> system.
>
> On the other hand, if you're building recirc, then I'd say double
everything in the
> system or else you're looking at a _big_ potential problem which could
stem from
> anything going wrong with your bacteria, your mechanicals (pumps,
aeration, excess
> feed, etc.) I've had all of the above happen any number of times, though I had
> back-up systems and was using good commercial equipment. Bearings can and
will fail
> in anything mechanical sooner or later. Brushes wear out unexpectedly.
Automatic
> feeders go haywire and overdose you fish with feed and suddenly your chemical
> balance goes off the scale. For this reason we run 2 of everything all the
time, and
> keep a back-up sitting in the shop ready to back-up the back-up.
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Subject: Re: Tunji
From: Adriana Gutierrez & Dennis LaGatta
Date: Mon, 02 Aug 1999 18:06:05 -0400
Tunji,
Be sure to look into the various alarm systems available. They can
monitor a number of different parameters such as electricity, water
temperature, dissolved oxygen, noise, etc. and will begin to dial a
series of pre-programmed telephone numbers in the event of a problem.
Adriana
> Tunji, read carefully what Jim is saying. Redundancy and back up
everything are very
> important in a recirc system. Everything mechanical can and will
breakdown at some
> point.
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Subject: Re: Sprayers
From: "William Brown"
Date: Mon, 2 Aug 1999 14:12:44 -1000
Found some great battery powered sprayers at Northern starting at $139 with
15G tank. Shipping looks reasonble too.
http://www.northern-online.com/cgi-bin/ncommerce/;execmacro/main.d2w/report
William Brown mahiwai@cmpmail.com
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Subject: Plastic Trays
From: dreadlox@cwjamaica.com (michael kent barnett)
Date: Mon, 02 Aug 1999 23:18:11 +0100
Could someone send me the URLs for plastic tray companies that were
posted a while back? (transparent)
Cheers,
Mike.
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Subject: Re: Greenhouse plans
From: dreadlox@cwjamaica.com (michael kent barnett)
Date: Mon, 02 Aug 1999 23:25:02 +0100
Mike Strates wrote:
>
Thought you would sneak in unnoticed right???
Good to see you back on the list...
Are you really into flying???
(uh ohhh...no....... ;) gotta remember not to fly United...)
Mike,
(Sue's partner.)
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Subject: Tomatoes in pop bottles
From: dreadlox@cwjamaica.com (michael kent barnett)
Date: Mon, 02 Aug 1999 23:50:17 +0100
For some pics of tommies in pop bottles...
http://www.hydroponicsonline.com/picture_page_10.htm
S&S Aqua Farm, 8386 County Road 8820, West Plains, MO 65775 417-256-5124
Web page http://www.townsqr.com/snsaqua/
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