Aquaponics Digest - Fri 02/13/98
Message 1: Re: Tilapia Harvest/Sales
from ryarnell@orednet.org (Richard Yarnell)
Message 2: RE: Tilapia Harvest/Sales
from Jacky Foo
Message 3: RE: Tilapia Harvest/Sales
from Jacky Foo
Message 4: RE: Tilapia Harvest/Sales
from james.rakocy@uvi.edu (James Rakocy, Ph.D.)
Message 5: Lettuce processes
from S & S Aqua Farm
Message 6: RE: Tilapia Harvest/Sales
from Jacky Foo
Message 7: RE: Tilapia Harvest/Sales
from ryarnell@orednet.org (Richard Yarnell)
Message 8: RE: Tilapia Harvest/Sales
from Jacky Foo
Message 9: RE: Tilapia Harvest/Sales
from james.rakocy@uvi.edu (James Rakocy, Ph.D.)
Message 10: Re: Tilapia Harvest/Sales
from Rod Watkins
Message 11: Introduction
from Mike Hirschfield
Message 12: Mike from Whitewater
from PeterJTheisen@eaton.com
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Subject: Re: Tilapia Harvest/Sales
From: ryarnell@orednet.org (Richard Yarnell)
Date: Fri, 13 Feb 1998 00:13:52 -0800
>... They are doing polyculture in ponds with six carp
>species using a manure-based system. They want to do tilapia for the tourist
>restaurants. There is no source of fish feed in the entire country. So I'm
>looking at production systems involving combinations of urea, triple super
>phosphate, some imported feed, and (forgive me) chicken litter. There's
>hardly any chicken litter either and fertilizers are hard to come by too.
>It's very basic. People live on the edge. Life expectancy is 53. Jim R.
Has anyone tried using naturally pelletized rabbit manure. It's totally
vegetaable. And on top of that, in an economy which is short of food, the
rabbits are about as efficient as any source of protein. They _can_ be
fed on green feed, require very little space, no refrigeration after
slaughter (they're small) and each doe yields 1200% of her body weight
each year. And as I said, there's his compact, clean manure.
Just a thought.
--
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Subject: RE: Tilapia Harvest/Sales
From: Jacky Foo
Date: Fri, 13 Feb 1998 10:04:32 +0100
From: James Rakocy, Ph.D.
Sent: Friday, February 13, 1998 2:11 AM
Nepal is not ready for aquaponics. They are doing polyculture in=20
ponds with six carp
species using a manure-based system. They want to do tilapia for the =
tourist
restaurants. There is no source of fish feed in the entire country. So =
I'm
looking at production systems involving combinations of urea, triple =
super
phosphate, some imported feed, and (forgive me) chicken litter. There's
hardly any chicken litter either and fertilizers are hard to come by =
too.
It's very basic.=20
---my comment
This "very basic" chicken litter and combination of chemicals and =
imported feed that you need, are you introducing it to Nepal or for the =
US / industrialised country?
If it is for Nepal, there are alternative local sources of nutrients and =
feeds. It would be a pity to see another project in Nepal that teaches =
local people to import feeds and chemicals when local alternatives =
exists.
In Fiji, the use of local resources (livestock-Tilipia system) was =
introduced by the Ministry of Agriculture, Fisheries and Forest and =
yield 2000 kg Tilapia per ha per year. Then someone introduced imported =
feeds from Australia into the integrated system....the yield doubled but =
the cost of feeds took half their income (thus increasing investment =
risks) ....then local people who were selling feeds started to advertise =
that you can double your yield if you use imported feeds.=20
Do you know the consumer price of Tilapia in and outside Kathmandu ? It =
is certainly not 1-2 USD per piece. Carp sells for about 1 USD per kilo =
outside Kathmandu.
jacky
=20
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Subject: RE: Tilapia Harvest/Sales
From: Jacky Foo
Date: Fri, 13 Feb 1998 10:28:35 +0100
Richard Yarnell wrote:
Sent: Friday, February 13, 1998 9:13 AM
Has anyone tried using naturally pelletized rabbit manure. It's totally
vegetaable. And on top of that, in an economy which is short of food, =
the
rabbits are about as efficient as any source of protein. They _can_ be
fed on green feed, require very little space, no refrigeration after
slaughter (they're small) and each doe yields 1200% of her body weight
each year. And as I said, there's his compact, clean manure.
Just a thought.
++++
Carps do go for "naturally pelletized" goat droppings. So they probably =
would also go for rabbit droppings. I dont have data on nutritive value =
these and digestibility for carps ? Do you !
Still I would always avoid feeding animal manure directly to fish.=20
There are other forms of feeds, high protein grasses and aquatic plants =
like duckweed, lemna, azolla which can be grown well using the nutrients =
from anaerobically digested manure. (see =
http://www.ias.unu.edu/vfellow/foo/ibs)=20
One of the basic principles of aquaponics is to growing plants using the =
nutrients from aquaculture wastewater. Water from fish ponds is rich in =
nutrients and they can be absorbed by aquatic plants. Treated water then =
returns back into the pond. To a commercial set up, this is cost savings =
on water and supplementary feeds.
regards
jacky
http://home2.swipnet.se/~w-25860/jacky =20
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Subject: RE: Tilapia Harvest/Sales
From: james.rakocy@uvi.edu (James Rakocy, Ph.D.)
Date: Fri, 13 Feb 1998 10:06:44 -0400 (AST)
>From: James Rakocy, Ph.D.
>Sent: Friday, February 13, 1998 2:11 AM
>Nepal is not ready for aquaponics. They are doing polyculture in
>ponds with six carp
>species using a manure-based system. They want to do tilapia for the tourist
>restaurants. There is no source of fish feed in the entire country. So I'm
>looking at production systems involving combinations of urea, triple super
>phosphate, some imported feed, and (forgive me) chicken litter. There's
>hardly any chicken litter either and fertilizers are hard to come by too.
>It's very basic.
>
>---my comment
>
>This "very basic" chicken litter and combination of chemicals and imported
feed that you need, are you introducing it to Nepal or for the US /
industrialised country?
>
>If it is for Nepal, there are alternative local sources of nutrients and
feeds. It would be a pity to see another project in Nepal that teaches local
people to import feeds and chemicals when local alternatives exists.
>
>In Fiji, the use of local resources (livestock-Tilipia system) was
introduced by the Ministry of Agriculture, Fisheries and Forest and yield
2000 kg Tilapia per ha per year. Then someone introduced imported feeds from
Australia into the integrated system....the yield doubled but the cost of
feeds took half their income (thus increasing investment risks) ....then
local people who were selling feeds started to advertise that you can double
your yield if you use imported feeds.
>
>Do you know the consumer price of Tilapia in and outside Kathmandu ? It is
certainly not 1-2 USD per piece. Carp sells for about 1 USD per kilo outside
Kathmandu.
>
>jacky
>
>
>Attachment Converted: C:\attachme\RETilapi
Jacky, thanks for the comment but this is a different model. It is one of
the largest companies in Nepal that is interested in doing this. If profit
is demonstrated, they could build a feed mill which could impact hundreds of
smaller farmers. They want 500-600 g fish, which cannot be done on manures
or fertilizers. With those inputs you can get 200+ g fish in 5 months.
Yields with fertilizer alone are about 2,000 kg/ha/5 months. Chiken litter
alone can give higher yields, about 2,800 kg/ha/5 months. A combination of
the two will give 3,700 and the highest profits. (This will be one of the
trials.) I agree that feeds can give higher yields but lower profits.
However, Asian Institute of Technology got excellent results by fertilizing
eith urea and TSP and feeding at 50% satiation once the fish reached 100 g.
At a stocking rate of 3 fish/m2 (male Nilotica), they obtained production of
15,372 kg/ha/8 months, a mean weight of 596 g, and a feed conversion ratio
of 1.03. Although the feed cost as much as small fish (200 g), there was a
premium price for large fish and they made a return of US$6,164/ha. I want
to test this system in Nepal. If it could be profitable, there would be many
spin-offs to the poorer people.
Fiji should look at Jamaica as a model. There it is a total feed-based
system and they are producing about 10 million lbs. annually and exporting
some of it. Outside Kathmandu any sized tilapia sells for US$0.80/kg,
including most carp species, except rohu which sells for US$1.00/kg. The
price would be higher in Kathmandu and probably higher yet for 500-600 g
fish to the tourist restaurants. This is a higher price that Thailand where
small tilapia sell for $0.50/kg and the large ones sell for $0.80/kg.
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Subject: Lettuce processes
From: S & S Aqua Farm
Date: Fri, 13 Feb 1998 09:19:16 -0600
To the list - Might be of interest to some of you - I remember John Greer
had at one point asked about "root rot or anything like that". Any others
with similar circumstances/remedies to share? Paula
Date: Thu, 12 Feb 1998 17:34:18 -0400 (AST)
>To: S & S Aqua Farm
>From: james.rakocy@uvi.edu (James Rakocy, Ph.D.)
>Subject: Re: Abstracts
>
>Paula, We start harvesting at 6:00 A.M. and finish the transplanting by
>11:00 A.M. (next to no down time) in the heat of the day. There are no
>failures from this process. However, lately we have damping off problems
>about 7-10 days later. To solve this we've been planting extra plants and
>replacing the morts (a fish term), but it is aggravating and time consuming.
>By 2.5 weeks the stem rot problem is over and the remaining plants grow well
>to harvest unless Pythium is acting up, which is a warm season problem for
>us. Unfortunately, we're in the subtropics so we have a long warm season. Jim
>
>>At 04:43 PM 2/4/98 -0400, you wrote:
>>>Paula, You may use the information for a verbal presentation. Please credit
>>>me and my co-authors.
>>
>>Thanks - We'll set it up that way.
>>
>>A question - in your raft hydroponics system, do you have any transplant
>>failures in your lettuce crop? We've had mixed success with transplanting
>>lettuces, so I had gone to growing from seed in the beds. I realize after
>>reading your literature how much time we're losing (I already knew this from
>>doing growing from transplants of basil - must be too many brain cells
>>falling out from old age). I believe the key lies in careful monitoring of
>>water levels for the first two days after transplant, and I'm returning to
>>that method.
>>
>>Thanks again.
>>
>>Paula
For those who are not aware, Dr. Rakocy grows his plants in a raft
hydroponics tank in a successful project in the Virgin Islands. Our plants
are grown in gravel beds in Missouri. Paula
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: Tilapia Harvest/Sales
From: Jacky Foo
Date: Fri, 13 Feb 1998 17:31:28 +0100
James Rakocy wrote:
>It is one of
the largest companies in Nepal that is interested in doing this. If =
profit
is demonstrated, they could build a feed mill which could impact =
hundreds of
smaller farmers. They want 500-600 g fish, which cannot be done on =
manures
or fertilizers. (cut)
----
Very interesting information, James. Thank you.=20
Fiji jas also embarked into large scale Tilapia production and sending =
de-boned fish to Hawaii. There has been critical comments on the =
viability but the project has strong governmental support. I dont know =
if they have an aquaponics operation with it.=20
There has also been talk of a possible JICA (Japan Intl Cooperation =
Agency) assistance on a hydroponics project with an NGO that has several =
fish ponds but unfortunately they are still not thinking of aquaponics.
Are there any plans in Nepal to use the wastewaters, for example, for =
rice cultivation since 2-3 croppings are in practice in the Terai =
regions ?. =20
One of the impacts of the project in Nepal, I believe, will be an =
increase the local price of grain bran (rice and wheat). The company =
will probably be able to absorb it or has greater control of this =
resource but local use for small scale poultry production might suffer. =
I hope that this project will not end up in trying to export their =
product to survive, and at the end become another developing country to =
feed countries with stronger currency exchange ??
But whatever it may be, it is always good to see a successful operation =
in a developing country.
=20
regards
jacky
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Subject: RE: Tilapia Harvest/Sales
From: ryarnell@orednet.org (Richard Yarnell)
Date: Fri, 13 Feb 1998 09:20:54 -0800
In your last two or three posts to this text based list, you have attached
a coded graphic. It has constituted over 50% of your messages. It may
look pretty to those who decode it, but is frowned upon in polite listserv
circles. If you didn't know it was being attached, it may be a ad for
your browser software.
Thanks from all of us who have to put up with old telephone wires and
expensive servers.
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Subject: RE: Tilapia Harvest/Sales
From: Jacky Foo
Date: Fri, 13 Feb 1998 19:28:55 +0100
Richard Yarnell wrote:
In your last two or three posts to this text based list, you have attached
a coded graphic. It has constituted over 50% of your messages. It may
look pretty to those who decode it, but is frowned upon in polite listserv
circles. If you didn't know it was being attached, it may be a ad for
your browser software.
+++++
thanks for drawing my attention to it. I was not aware that it was attached
since the repro copies that are re-distributed back to me did not show at
all. I have switched off MIME and I hope this will help. Pls let me know if
it doesnt !! and suggestions to rid this problem would be appreciate.
regards
jacky
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Subject: RE: Tilapia Harvest/Sales
From: james.rakocy@uvi.edu (James Rakocy, Ph.D.)
Date: Fri, 13 Feb 1998 14:43:27 -0400 (AST)
>James Rakocy wrote:
>>It is one of
>the largest companies in Nepal that is interested in doing this. If profit
>is demonstrated, they could build a feed mill which could impact hundreds of
>smaller farmers. They want 500-600 g fish, which cannot be done on manures
>or fertilizers. (cut)
>----
>
>Very interesting information, James. Thank you.
>
>Fiji jas also embarked into large scale Tilapia production and sending
de-boned fish to Hawaii. There has been critical comments on the viability
but the project has strong governmental support. I dont know if they have an
aquaponics operation with it.
>
>There has also been talk of a possible JICA (Japan Intl Cooperation Agency)
assistance on a hydroponics project with an NGO that has several fish ponds
but unfortunately they are still not thinking of aquaponics.
>
>Are there any plans in Nepal to use the wastewaters, for example, for rice
cultivation since 2-3 croppings are in practice in the Terai regions ?.
This project has no governmental support. They could use the wastewater for
rice, because there's rice all over the place. I don't know what the
ramifications of a successful project will be, the level of commitment, or
whether it will be successful. What's wrong with earning foreign exchange?
U.S. agriculture exports $50 billion worth of products and it's one of our
great success stories.
>One of the impacts of the project in Nepal, I believe, will be an increase
the local price of grain bran (rice and wheat). The company will probably be
able to absorb it or has greater control of this resource but local use for
small scale poultry production might suffer. I hope that this project will
not end up in trying to export their product to survive, and at the end
become another developing country to feed countries with stronger currency
exchange ??
>
>But whatever it may be, it is always good to see a successful operation in
a developing country.
>
>regards
>jacky
>
>Attachment Converted: C:\attachme\RETilap1
>
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Subject: Re: Tilapia Harvest/Sales
From: Rod Watkins
Date: Fri, 13 Feb 1998 14:42:01 -0800
I was just curious as to whether Jacky Foo's posts run off everybody
else's screen like they do mine. If so how could it be corrected? I
have enjoyed reading them but it is difficult.
Rod
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Subject: Introduction
From: Mike Hirschfield
Date: Fri, 13 Feb 1998 14:48:47 -0600
Hello to all,
I too have been lurking on the list for a while.
My name is Mike Hirschfield and I live in Whitewater, a suitcase town in
southern Wisconsin. My interest in Aquaponics is quite new and I have
found this list to be very interesting and invaluable to setting up a pilot
project.
I have not had the experience of growing by hydrophonic methods (always
used the dirt). However, my hobby for 20+ has been breeding and raising
freshwater ornamentals for fun and little profit.
Most recently, I have built a pilot recirculating system on my front
porch. I don't have the power hooked up yet, but hope to be operational
next month. It consist of one 150 gal tank and a 30 cu ft grow bed.
We do not have a lot of sunny days during the Winter months here, to guess,
a low light variety of herb or vegetable would be appropriate. Any
suggestions? I will be stocking with Tilapia initially, if all goes well
the next tank will be Shovelnose Sturgeon (slow growing ..but tasty).
I work for the University of Wisconsin-Whitewater, I wear quite a few hats
here, but my primary one is Assistant Director of Procurement.
Mike Hirschfield
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Subject: Mike from Whitewater
From: PeterJTheisen@eaton.com
Date: 13 Feb 98 16:11:53 EST
Mike: I am happy to see someone from Wisconsin on the list. Where are you
getting your Tilapia, and what species will you be growing. I know of two
tilapia farms in the state from which you can get fish if you are
interested. I like you am tired of Wisconsin's sunless winters and grow
all of my vegetables under metal Halide lamps. More expensive but
dependable.
I wish you luck and success
Pete t. from West Bend
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