Aquaponics Digest - Thu 12/04/97
Message 1: Re: Commercial aquaculture
from GROMAXaz
Message 2: Re: DANGER!: Animal Manure as Fish Food
from "H.Doelle"
Message 3: Re: Tilapia permits
from HYDRO4U
Message 4: Small aquaponic systems
from HYDRO4U
Message 5: Re: Small aquaponic systems
from Rebecca Nelson
Message 6: RE:Small aquaponic systems
from Erik.Westgaard@pcsmail.pcshs.com
Message 7: SUCCESS- DIGEST AVAILABLE
from S & S Aqua Farm
Message 8: Re: SUCCESS- DIGEST AVAILABLE
from S & S Aqua Farm
Message 9: Re: Permits
from "Geoffrey Stone"
Message 10: Re: Commercial aquaculture
from "Darren J. Hanson"
Message 11: Re: Plastic tanks
from "Geoffrey Stone"
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| Message 1 |
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Subject: Re: Commercial aquaculture
From: GROMAXaz
Date: Thu, 4 Dec 1997 15:20:03 -0500 (EST)
In a message dated 97-12-04 13:32:51 EST, Frank wrote:
<< I've not had any direct experience but am considering implementing such a
system. But it must be operated on a commercial basis to produce a
reasonable
return on investment and labor. Thanks so much for sharing your
experiences.
>>
Frank, I have two more points to make regarding feeding with lower density
levels and facility design. Regardless of the shape of the tank, I would
look to line the tank with a cage to prevent breeding and reduce the
territoriality of Tilapia during growout. By using course netting material
and an expandable framework, I can increase the size of the cage during the
growout phase to accomodate increased fish size. I can also move the entire
cage of fish to another tank if necessary, however, I would not move more
than one time. The common assumption is that you should keep density levels
high at all times. I beleive density levels should be high only during the
final stages of growout where you would intensify aeration and improve the
ration for a short period. This reduces the risk of problems.
Ben
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Subject: Re: DANGER!: Animal Manure as Fish Food
From: "H.Doelle"
Date: Fri, 05 Dec 1997 08:37:20 +1100
Dear Rob,
Thanks for the message below. I had not heard such an implication as yet,
but it certainly demonstrates the increasing danger of some practices.
I actually learned two days ago, that we had in Australia two tragic deaths
of people using 'potting mixtures' in their gardening activities. Elderly
people. They found Leggionella in the potting mix and now a health warning
is out all over our country to 'use gloves when working with any potting
mixtures OR compost mixtures' and thoroughly clean hands etc. after use.
In my teaching I always emphasize: MICROORGANISMS ARE THE MOST POWERFUL
CREATURES ON THIS PLANET. THEY CAN KILL MERCILESS BUT CAN ALSO DO A
MAGNIFICENT JOB. Sounds familiar ? It is true !
I most sincerely hope and wish that your friend will recover as difficult as
it may be.
Best regrads and many thanks
Horst Doelle
Horst W.Doelle,D.Sc.
Director, MIRCEN-Biotechnology Brisbane
Chairman, IOBB
Hon.Member of Depts. Microbiology & Chemical Engineering
FAX: +617-38783230
Email: H.Doelle@mailbox.uq.edu.au
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Subject: Re: Tilapia permits
From: HYDRO4U
Date: Thu, 4 Dec 1997 16:49:11 -0500 (EST)
In a message dated 97-12-04 01:21:31 EST, you write:
> Subj: Re: Hello
> Date: 97-12-04 01:21:31 EST
> From: gwatkins@yournet.com (Gordon Watkins)
> Sender: aquaponics
> Reply-to: aquaponics@townsqr.com
> To: jr2476@alpha.rwu.edu (Jason Rochelo)
> CC: aquaponics@townsqr.com (Aquaponics)
>
> My understanding is that permits for tilapia are only required in
> states like Texas and Florida where tilapia can survive year-round in
> the wild, which I doubt would be the case in RI. Perhaps others can
> confirm?
> I recently posted the particulars of research done at NC State in the
> early 90's. If you would like it please email me directly. I'd be
> interested in hearing what other research some of you have uncovered.
> Regards,
> Gordon
>
>
Virginia also requires a permit for Tilapia.
Carl
Carl O. Anderson Virginia Hydroponics, Inc.
(757) 490-5425 368 Newtown Rd. #105
HYDRO4U Virginia Beach, VA 23462
Teacher Resource Center http://www.hydro4u.com
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Subject: Small aquaponic systems
From: HYDRO4U
Date: Thu, 4 Dec 1997 16:49:13 -0500 (EST)
Hello all,
Is anyone familiar with a low cost, small system or kit, or plans
to build a small system? We have many students wanting to do
science projects and they need the hardware to make it work. We
try to help with descriptions of how they can build something, but
many don't have the tools or talent.
Also, several schools have expressed interest in smaller systems
that would allow for a variety of comparisons. Any suppliers of
off-the-shelf systems at reasonable costs?
Carl
Carl O. Anderson Virginia Hydroponics, Inc.
(757) 490-5425 368 Newtown Rd. #105
HYDRO4U Virginia Beach, VA 23462
Teacher Resource Center http://www.hydro4u.com
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Subject: Re: Small aquaponic systems
From: Rebecca Nelson
Date: Thu, 04 Dec 1997 14:06:49 -0800
> Is anyone familiar with a low cost, small system or kit, or plans
> to build a small system? We have many students wanting to do
> science projects and they need the hardware to make it work. We
> try to help with descriptions of how they can build something, but
> many don't have the tools or talent.
> Also, several schools have expressed interest in smaller systems
> that would allow for a variety of comparisons. Any suppliers of
> off-the-shelf systems at reasonable costs?
The only small aquaponics kits that I am aware of are sold by Aquatic
Eco-Systems in Florida 1-800-422-3939. There are two different types
listed in their 97 catalog. If there are others I would love to hear
about them.
Rebecca Nelson
Nelson/Pade Multimedia
tel 209-742-6869, fax 209-742-4402
http://www.aquaponics.com
Publisher of the Aquaponics Journal
Producer of:
- The Encyclopedia of Hydroponic Gardening CD-Rom
- All About Aquaculture CD-Rom
- The Hydroponics Curriculum
- How To Start and Succeed in the Hydroponics Business Book
- Hobby Hydroponics Video
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| Message 6 |
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Subject: RE:Small aquaponic systems
From: Erik.Westgaard@pcsmail.pcshs.com
Date: 4 Dec 1997 23:16:30 UT
In regards to this earlier email, please define what low cost really means to
you. I have a small system outside here in Phoenix, that I have built and
beingvery cost-consious, I have found that a complete aquaponic system can be
built with very minimal cost. Just define the size of the unit and dollars
available.
Example: Using an aquarium, cycle timer, powerhead, little hose, air-pump.
Boom, instant system for less than US$100.
------------------( Forwarded letter 1 follows )--------------------
Date: Thu Dec 04 14:47:02 1997
To: aquaponics@townsqr.com
From: HYDRO4U
Reply-To: aquaponics@townsqr.com
Subject: Small aquaponic systems
Hello all,
Is anyone familiar with a low cost, small system or kit, or plans
to build a small system? We have many students wanting to do
science projects and they need the hardware to make it work. We
try to help with descriptions of how they can build something, but
many don't have the tools or talent.
Also, several schools have expressed interest in smaller systems
that would allow for a variety of comparisons. Any suppliers of
off-the-shelf systems at reasonable costs?
Carl
Carl O. Anderson Virginia Hydroponics, Inc.
(757) 490-5425 368 Newtown Rd. #105
HYDRO4U Virginia Beach, VA 23462
Teacher Resource Center http://www.hydro4u.com
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| Message 7 |
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Subject: SUCCESS- DIGEST AVAILABLE
From: S & S Aqua Farm
Date: Thu, 04 Dec 1997 18:20:01 -0600
Members -
After several days of researching ways to provide a digest version (and
possibly an archive file), Kathy Conner, our local wonderful, caring ISP
provider co-owner, has found a way to work a digest version with existing
software so the cost doesn't skyrocket. Earlier investigations found
massive software which could only be licensed at a cost of appx. $2,500/year
- way out of the realm of our budget.
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sent once per day, send a message to:
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In the message body:
subscribe
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We are so grateful to Kathy for this service. One of the many reasons we
enjoy living in our relatively small rural community.
Next week we will implement our archive format onto our web page. Until
then, we are saving all correspondence by subject and will be happy to
forward entire files to those who wish it.
Thanks to all of you who have stayed with us during this set-up phase.
Paula Speraneo
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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| Message 8 |
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Subject: Re: SUCCESS- DIGEST AVAILABLE
From: S & S Aqua Farm
Date: Thu, 04 Dec 1997 18:25:39 -0600
Sorry - one more note,
People will not be able to send messages to "aquaponics-digest@townsqr.com"
-- they will have to send any messages to "aquaponics@townsqr.com"
Happy to note that as of 6:13 today, 139 individuals have subscribed to this
list.
Now, on to the topics and more progress!
Paula Speraneo
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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| Message 9 |
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Subject: Re: Permits
From: "Geoffrey Stone"
Date: Thu, 4 Dec 1997 17:29:02 -0600
The "Baitfish, Mussel and Fish Farmers Regulations" updated November, 1996
state:
FISH FARMER REGULATIONS
42.00-A FISH FARMER DEFINED. A Fish Farmer shall mean any person, firm, or
corporation engaged in the propagation or production of crawfish, fish,
turtles or minnows on property owned or controlled by said farmer.
42.01-FISH FARMER PERMIT REQUIREMENTS. It shall be unlawful for fish
farmers to culture and/or sell fish, aquatic turtles, crawfish, or minnows
without first obtaining a Fish Farmers Permit annually. etc.
There is an exception for fish intended for aquarium hobbyist trade.
This was obtained from the AR Game and Fish Commission; 2 Natural Resources
Dr.; Little Rock, AR 72205
-----Original Message-----
From: Gordon Watkins
To: aquaponics@townsqr.com
Date: Thursday, December 04, 1997 7:55 AM
Subject: Permits
>Hell Geoff,
> Do you recall the requirements for obtaining a permit in AR? Does it
>have to do with the size of the operation or the species raised?
> Thanks, Gordon
>
>Geoffrey Stone wrote:
>>
>> I obtained a permit for fish farming from the AR Game & Fish Commission.
I
>> assume other states have a similar agency. The permit costs $25/yr. in
AR.
>>
>
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| Message 10 |
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Subject: Re: Commercial aquaculture
From: "Darren J. Hanson"
Date: Thu, 4 Dec 1997 18:13:19 -0800 (PST)
At 03:01 PM 12/4/97 -0500, GROMAXaz wrote:
>With regards to sorting and continuing to feed the smaller fish, I think this
>is the kiss of death for a Tilapia enterprise. At first sorting the smaller
>fish have demonstrated they are weaker and gain less on feed. After several
>sortings you have now the poorest efficiency fish dominating your facilities.
> The solution is to keep the same lot of fish together through growout when
>you have reached the ideal weight for the largest fish. At that time, sort
>them according to market (1lb to 1.5lb. for filets, 3/4lb to 1 lb. for live
>market and balance to the extruder). This approach provides a true picture
>of your breeding stock capbilities and will allow you to produce fish at the
>maximum efficiency the breeding will allow.
Well, I've never tried to raise Tilapia, or any other food fish, on a
commercial basis, my fiancee and I do raise several varieties of ornamental
catfish for the pet trade. It is our experience that the fish that grow the
fastest are not necessarily the best users of food, rather they are the most
aggressive and successful in keeping the other fish from eating. Our
solution has been to keep stocking densities lower and scatter the food over
a large area. That way while the bullies are fighting over the food in one
corner, the less agressive fish and happily eating what's falling in the
other corners.
It seems from the messages I've read on this list that most Tilapia
producers are growing out fingerlings that they are getting from another
source, but for those who are spawning their own fry, you need to keep in
mind that by always choosing from the largest, fastest growing fish, you are
actually selecting for agressive behavior. After a surprising small number
of generations, you can end up with a blood line that can no longer
successfully spawn without human intervention because they have become so
agressive. (Males kill females and/or the eggs and/or the newly hatched fry
in an effort to "defend their territory".)
Just my 2 cents.
-- dj
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Subject: Re: Plastic tanks
From: "Geoffrey Stone"
Date: Thu, 4 Dec 1997 20:24:38 -0600
My one tank is 48"Dia. X 4' high X 0.040" thickness. It is "Sun-Lite HP" a
Kalwall trademark. It is also the same material that I used for the outside
glazing for my greenhouse. The tank cost $415.00 delivered in March of '96.
Geoffrey Stone
Ozark, AR
-----Original Message-----
From: S & S Aqua Farm
To: aquaponics@townsqr.com
Date: Thursday, December 04, 1997 9:31 AM
Subject: Re: Plastic tanks
>At 09:13 PM 12/1/97 -0600, Geoff Stone wrote:
>>I purchased my tank from:
>>Solar Components Corp.
>
>Geoff - What size tank are you using? Only one in your system? Could you
>tell us what the cost was, including shipping? We're always looking for
>alternative suppliers.
>
>Paula Speraneo
>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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