Aquaponics Digest - Wed 06/30/99
Message 1: Tilapia feed - arugula report
from Adriana Gutierrez & Dennis LaGatta
Message 2: RE: Any watercress data?
from "Ronald W. Brooks"
Message 3: Re: Any watercress data?
from james.rakocy@uvi.edu (James Rakocy, Ph.D.)
Message 4: Re: Tilapia feed - arugula report
from "Mark Brotman"
Message 5: RE: Tilapia feed - arugula report
from "Ronald W. Brooks"
Message 6: Re: monitoring
from "vpage"
Message 7: Re: monitoring
from Adriana Gutierrez & Dennis LaGatta
Message 8: Re: Tilapia feed - arugula report
from "Mark Brotman"
Message 9: RE: Any watercress data?
from khale@ballistic.com
Message 10: Re: Tilapia feed - Chinese water spinach (was arugula)
from "H. Allen Sylvester"
Message 11: Re: Tilapia feed - arugula report
from "William Brown"
Message 12: Re: monitoring
from "Andrew.D"
Message 13: RE: Tilapia feed - Chinese water spinach (was arugula)
from "Ronald W. Brooks"
Message 14: Re: Any watercress data?
from "James Bell"
Message 15: Aquaponic Co-operative in Australia
from Gary Bruce
Message 16: Re: Tilapia feed - Chinese water spinach (was arugula)
from "vpage"
Message 17: Re: Any watercress data?
from "vpage"
Message 18: Re: monitoring
from "vpage"
Message 19: Re: monitoring
from "vpage"
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Subject: Tilapia feed - arugula report
From: Adriana Gutierrez & Dennis LaGatta
Date: Wed, 30 Jun 1999 06:47:39 -0400
After the report of tilapia liking watercress I took some arugula
trimmings to my neighbor's fish thinking that they might like its sharp
bite also. They didn't care for it at all. Are there other greens that
they like better?
While I haven't gotten brave enough to integrate fish into my systems I
did manage to infect my 80-something year old neighbors with the idea
when I told them we could get fingerlings locally. They immediately
called and ordered tilapia to stock their green, abandoned swimming
pool. The fish have grown incredibly fast in about a month. Right now
they only have about 50 males in a 20,000 gallon pool. At some point in
the future I may propose increasing the density and running the water
into growing beds in my yard next door. They would go for it in a
heartbeat!
Kevin, I wonder about the cost of feeding watercress sprouts...
> might have an idea of what percentage of your growing space might be
> needed to feed the fish if planted in watercress? How much space for
> 2:1 feed to final fish
Everybody have a great day,
Adriana
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Subject: RE: Any watercress data?
From: "Ronald W. Brooks"
Date: Wed, 30 Jun 1999 10:11:31 -0400
Good question , And the answer is
I don't know
I have been looking at types of greens to feed my Tilapia to supplement
feedings
The only real reason I thought of watercress is the fact that I have a 2 X 3
foot section of the veggie filter of my 5000 gallon Koi pond planted with
it. The koi greedily jump and pull any stragglers into the pond so they can
munch it down
I also harvest string algae that builds up in the Koi pond for the Tilapia
I have noticed that they have a better appetite for pelleted feed with a
little bit of fresh plant matter daily.
Adriana I have never noticed a bitter taste from my watercress
-----Original Message-----
From: aquaponics
[mailto:aquaponics]On Behalf Of KevinLReed
Sent: Tuesday, June 29, 1999 10:30 PM
To: S&S Aquaponics
Subject: Any watercress data?
Hi,
Since your trial found that the tilapia like watercress. I was wondering
if you
might have an idea of what percentage of your growing space might be
needed to feed the fish if planted in watercress? How much space for 2:1
feed to final fish
weight? How close to a "perpetual motion" greenhouse?
Kevin
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Subject: Re: Any watercress data?
From: james.rakocy@uvi.edu (James Rakocy, Ph.D.)
Date: Wed, 30 Jun 1999 10:38:12 -0400 (AST)
This is not the ratio you want, but I have studied the production of
watercress in an aquaponic system and these are my results:
Yield - 2.7 kg/m2 wet weight
0.15 kg/m2 dry weight
Productivity - 18.5 g/m2/day wet weight
1.0 g/m2/day dry weight
0.05 g/m2/day for nitrogen uptake
Dry weight - 5.4%
Nitrogen - 4.6% of dry weight
Crude protein - 29.0% of dry weight
These are means of three outdoor systems in Alabama during the summer, May
21 - Oct. 11
Jim R.
>Hi,
>
>Since your trial found that the tilapia like watercress. I was wondering if you
>might have an idea of what percentage of your growing space might be needed
to feed the fish if planted in watercress? How much space for 2:1 feed to
final fish
>weight? How close to a "perpetual motion" greenhouse?
>
>Kevin
>
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Subject: Re: Tilapia feed - arugula report
From: "Mark Brotman"
Date: Wed, 30 Jun 1999 13:40:31 -0400
I ran some trials on kinds of vegetation to grow aquaponically in the
tropics. I found that what we knew as "kang kung" (or "kangkong" or
possibly "water bind-weed" or certainly Ipomea aquatica) grew amazingly
well-- 4" cuttings grew 12' or more in four weeks in a system based on Jim
Rakocy's rafts. The fish seemed to eat the leaves with great gusto. It's
reported to have 28% crude protein on a dry weight basis, 2.1% as fresh
"leaves and stem." No off-flavors noted in the fish. People like to eat
the stuff too-- pretty tasty.
Mark Brotman
Aquaculturist
mbrotman@cropking.com
Adriana Gutierrez & Dennis LaGatta wrote:
> After the report of tilapia liking watercress I took some arugula
> trimmings to my neighbor's fish thinking that they might like its sharp
> bite also. They didn't care for it at all. Are there other greens that
> they like better?
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Subject: RE: Tilapia feed - arugula report
From: "Ronald W. Brooks"
Date: Wed, 30 Jun 1999 15:07:14 -0400
Mark
Do you know of any source for these seeds ?
Ron
The One Who Walks Two Paths
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Subject: Re: monitoring
From: "vpage"
Date: Wed, 30 Jun 1999 13:38:59 -0600
Dear list,
We are ready to buy an emergency monitoring system in our tilapia hatchery
and growout-O2/ pH/ water levels etc. Any favourites or disliked ones??
Thanks, Victoria
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Subject: Re: monitoring
From: Adriana Gutierrez & Dennis LaGatta
Date: Wed, 30 Jun 1999 15:54:14 -0400
Victoria,
I've heard good things about the SensaPhone.
Adriana
> We are ready to buy an emergency monitoring system in our tilapia hatchery
> and growout-O2/ pH/ water levels etc. Any favourites or disliked ones??
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Subject: Re: Tilapia feed - arugula report
From: "Mark Brotman"
Date: Wed, 30 Jun 1999 16:02:42 -0400
This is a multi-part message in MIME format.
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Hi Ron, Always propagated from cuttings, but it is an edible morning glory. If
you go to Johnny's Seeds web page (www.johnnyseeds.com) their "Pearly Gates,"
with the white flower, looks just like it. The good folks there are looking
into edible varieties for me; I'll pass any news along (if and) when they find
something. Mark
--
Mark J. Brotman
Aquaculturist
CropKing
5050 Greenwich Rd.
Seville, OH 44273
Tel: 330/769-2002, Fax: 330/769-2616
Email: mbrotman@cropking.com
On the web at http://www.cropking.co
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Subject: RE: Any watercress data?
From: khale@ballistic.com
Date: Wed, 30 Jun 1999 15:44:21 -0500
At 10:11 AM 6/30/99 -0400, you wrote:
> Good question , And the answer is I don't know I have been looking at
> types of greens to feed my Tilapia to supplement feedings The only real
>reason I thought of watercress is the fact that I have a 2 X 3 foot
>section of the veggie filter of my 5000 gallon Koi pond planted with it.
>The koi greedily jump and pull any stragglers into the pond so they can
>munch it down I also harvest string algae that builds up in the Koi pond
>for the Tilapia I have noticed that they have a better appetite for
>pelleted feed with a little bit of fresh plant matter daily. Adriana I
>have never noticed a bitter taste from my watercress -----Original
>Message-----
>From: aquaponics
>[mailto:aquaponics]On Behalf Of KevinLReed
>Sent: Tuesday, June 29, 1999 10:30 PM
>To:&S Aquaponics
>Subject: Any watercress data?
>
> Hi, Since your trial found that the tilapia like watercress. I
>was wondering if you might have an idea of what percentage of your
>growing space might be needed to feed the fish if planted in
>watercress? How much space for 2:1 feed to final fish <> Kevin
> talapia love the leaf off turnip greens- Ken Hale (Texas Talapia Farmer)
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Subject: Re: Tilapia feed - Chinese water spinach (was arugula)
From: "H. Allen Sylvester"
Date: Wed, 30 Jun 1999 17:10:18 -0500
Ron,
Chinese water spinach (pahk boong in Thai, kang kong in the
Philippines) is commonly grown from cuttings, i.e., the bunch of greens
you can buy for around $1 in a Vietnamese grocery store. This is much
faster and easier. However, it can be grown from seeds, which can
sometimes also be bought in a Vietnamese grocery store.
Allen
H. Allen Sylvester
Baton Rouge, LA
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Subject: Re: Tilapia feed - arugula report
From: "William Brown"
Date: Wed, 30 Jun 1999 15:10:04 -1000
Also known as roquette and rocket. Seed is quite common in seed catalogs.
Burpee has it, try Johnny's, Stokes, Parks, etc.
William Brown mahiwai@cmpmail.com
(aka lettuce@hilo.net)
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Subject: Re: monitoring
From: "Andrew.D"
Date: Thu, 1 Jul 1999 11:06:54 +0930
One of the most user friendly and certainly affordable systems is the
Octopus 3000. It is developed and sold by Aquadyne.You should have an agent
near you.
We have sold countless units in Australia as the Australasian agent.
Andrew Dezsery
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Subject: RE: Tilapia feed - Chinese water spinach (was arugula)
From: "Ronald W. Brooks"
Date: Wed, 30 Jun 1999 22:10:11 -0400
Thanks Allen
Next time I go into town I will have to hunt it up at the Thai market
Ron
The One Who Walks Two Paths
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Subject: Re: Any watercress data?
From: "James Bell"
Date: Wed, 30 Jun 1999 22:39:13 -0400
notice date is correct just trying to get to the millennium
quicker
I am wondering if it is a smart idea trying to use the
resources of the grow beds to feed the fish as I seem to get
the impression that grow beds are where your profit comes from.
I like gravel beds but do realize that they have limitations.
I wonder if it would be feasible to have water go from fish tank
to gravel beds then to a raft system then back to fish tank
question is would there still be sufficient nutrient load in the
water to make the rafts work
also seems the tilapia like 80 deg water how would that affect
lettuce
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Subject: Aquaponic Co-operative in Australia
From: Gary Bruce
Date: Thu, 01 Jul 1999 13:01:19 +1000
Dear Readers,
I am currently establishing an aquaponic farmers Co-op in Canberra,
Australia. My local business, Urban Aquaponics has the vision to put
an integrated aquaculture and hydroponic system in every suburban
backyard and urban hobby farm in the region. We also would like to
see live seafood tanks offering live-fresh seafood product retail
through supermarkets, restaurants and hotels. We also research,
supply and support the very latest in technology for the serious
commercial grower.
The Co-op is to provide a centralised wholesale bulk holding and
processing facility to handle all members produce (fish, crustacean,
flowers, vegetables, herbs) and value added (condiments, preserves etc)
regardless of the individual growers volume. The Co-op is also to
establish a mobile (live and/or fresh) process and transport capability
for individual pick up, process, quality inspection and transport to
either the wholesale facility or alternative retail outlets.
The wholesale facility will carry the volume and variety required and
provide a secondary quality inspection point to enable market
penetration and support from high end specialty restaurants,
supermarkets, grocers and fish outlets. For the small volume grower,
there is also the option to retail directly through a farmers market
retail outlet - manned by registered and trained members of the Co-op -
the produce sold having also been inspected for quality and correct
labelling by the mobile inspection, collection unit.
Our definition of aquaponics incorporates organic growing methods,
intensive aquatic animal culture, hydroponic and organic soil based
horticulture, viticulture and agriculture. Produce must be clearly
marked as either "home-grown", "hydroponic", "certified organic" or
"organic hydro". Growers must register and be certified to use any
particular label. The latter two support a price premium to encourage
growers to go that extra step and for the higher risk to quality end
product.
The Co-op central facility will be positioned within the city limits and
has sufficient space to also establish a commercial scale aquaponic
technology centre and farm capable of producing five tonne of fish
product and 20-30 tonne of fresh vegetable produce a year. The centre
will be used to promote aquaponics throughout the region, providing
tours and educational programs for the cities school children, adult
industry training programs, and select programs and internships for our
cities homeless and/or unemployed youth (16-25yrs). This approach will
enable us to reduce our labour cost component and make it possible to
receive community and government support beyond the resources of Co-op
members alone. Not to mention the possible marketing potential for our
products and level of consumer support and loyalty that can be generated
through focusing our efforts for the betterment of the community at
large.
I hope that this has given a few ideas of what can be done to increase
the marketing and saleability of the small growers produce through
co-operation. As this is a developing project, I would be interested
in hearing particularly from any list members in the ACT or Southern NSW
region of Australia who may wish to contribute/participate in some way.
I also hope that this may stimulate further discussion from list members
involved community or co-op/collective type organisations or activities
where aquaponics provides the foundation.
Gary Bruce
Proprietor - Urban Aquaponics
Founder of the ACT and Regional Aquaponics Farmers Co-operative and the
ACT and
Regional Aquaponic Growers Society
PO Box 34
Campbell ACT 2612
Australia
Within Australia - Ph: 0414 369 402
International - Ph: +61 414 369 402
Email: gbruce@aucom.com.au
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Subject: Re: Tilapia feed - Chinese water spinach (was arugula)
From: "vpage"
Date: Wed, 30 Jun 1999 22:08:50 -0600
Yeah! My water spinach grew like a weed too! I grew it and the watercress
from cuttings that I bought in a Chinese vegetable store! It is delicious in
its young stages. Victoria
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Subject: Re: Any watercress data?
From: "vpage"
Date: Wed, 30 Jun 1999 22:19:07 -0600
For the watercress and spinach you don't need even a raft system. If the
plant is stable for initial growth (2") (gravel will do) then it will take
care of itself in tilapia waste water. You will be hacking your way through
it and feeding it to the ducks and geese as well. The water is denitrified
and saturated with oxygen. Larger lettuce shows some signs of iron
deficiency but my "designer lettuces" were harvested at 2-3" before it could
affect them. Dr. Rakocy can answer these questions a lot better than I can.
Victoria
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Subject: Re: monitoring
From: "vpage"
Date: Wed, 30 Jun 1999 22:20:25 -0600
Thank-youV
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Subject: Re: monitoring
From: "vpage"
Date: Wed, 30 Jun 1999 22:23:34 -0600
Thanks Adriana
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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