Aquaponics Digest - Sat 09/18/99
Message 1: Re: Re: Trout dietary needs
from "Sam Levy"
Message 2: barramundi
from "Sam Levy"
Message 3: Re: PhotoPoint
from Adriana Gutierrez & Dennis LaGatta
Message 4: Barramundi
from Colin Johnston
Message 5: Re: Root Crops
from "KevinLReed"
Message 6: organic certification
from "KevinLReed"
Message 7: Re: tilapia origin
from james.rakocy@uvi.edu (James Rakocy, Ph.D.)
Message 8: Re: tilapia origin
from "TGTX"
Message 9: large growing operations
from Adriana Gutierrez & Dennis LaGatta
Message 10: Re: tilapia origin
from "Barry Thomas"
Message 11: unsubscribe
from randy garman
Message 12: Re: Root Crops
from "Jewel Lopez"
Message 13: Water barrels
from "Jewel Lopez"
Message 14: Recirc. Marine Systems
from dreadlox@cwjamaica.com (michael kent barnett)
Message 15: Concrete...
from dreadlox@cwjamaica.com (michael kent barnett)
Message 16: Re: unsubscribe
from dreadlox@cwjamaica.com (michael kent barnett)
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Subject: Re: Re: Trout dietary needs
From: "Sam Levy"
Date: Sat, 18 Sep 1999 01:11:21 PDT
jewel--
there are tremendous advantages to using dry diets including:
they are easy to present in a controled way which helps level out o2 demand
& ammonia production over the course of the day
for trout (and other salmonids), there are specialized balanced formulations
a balanced diet (both in terms of individual components & between the major
groups--protein, lipid, energy) helps prevent cannibalism (always a
potential problem in a predator species)
they are readily presented in a size appropriate to the animals mouth
they allow easy comparison of results between your system and others
they are easily stored
by they way, work done in the late 70's or early 80's (mackie--i think)
indicated that day length was the major determiner of growth in salmonids
(more than water temperature).
sam
>From:
>
>Could you survive on worms alone?.... My doubts exist on this one. Trout
>are very complex and
>very picky in their feeding habits (even so much so that light influences
>their feeding habits
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Subject: barramundi
From: "Sam Levy"
Date: Sat, 18 Sep 1999 01:22:43 PDT
does anyone have any information on the performance of asian sea
bass--barramundi--(Lates calcarifer) in closed recirculating systems of any
kind?
sam
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
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Subject: Re: PhotoPoint
From: Adriana Gutierrez & Dennis LaGatta
Date: Sat, 18 Sep 1999 05:03:49 -0400
This group is awesome...
> Just give me a couple of weeks (2), and I will talk to a few people here in
> Jamaica. I will arrange to put together a site just for this 'project'.
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Subject: Barramundi
From: Colin Johnston
Date: Sat, 18 Sep 1999 17:36:36 +0800
Sam,
>does anyone have any information on the performance of asian
>sea bass--barramundi--(Lates calcarifer) in closed recirculating
>systems of any kind?
Check the home page of the CSIRO down in OZ. Both they, the
DPI and the University of Queensland have been doing work on
the barra and a company near Brisbane has reared them in a
recirc system - successfully :) Some of the delegates to the
World Aquaculture Society's conference in Sydney this year
visited the farm on the post-conference farm tours ! I did :)
Colin
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Subject: Re: Root Crops
From: "KevinLReed"
Date: Sat, 18 Sep 1999 09:06:36 -0700
Hello All,
I have seen potatoes grown in moist straw of about 10 to 14 inches=20
thick over a soil bed. I think these matured to very normally shaped=20
and tasty potatoes if just a bit on the small side.
>Hello Mike,
>I concur with the above. I grew potatoes in sand bags full of perlite =
and=20
>they all came out with weird shapes, nothing looking like a potato, and =
with=20
>a sand paper skin texture. The tasted real good and grew easily.
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Subject: organic certification
From: "KevinLReed"
Date: Sat, 18 Sep 1999 09:09:28 -0700
Hello All,
I was wondering if any in the group are growing certified organic crops.
Maybe some one knows about certifying agencies?
Kevin
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Subject: Re: tilapia origin
From: james.rakocy@uvi.edu (James Rakocy, Ph.D.)
Date: Sat, 18 Sep 1999 13:45:40 -0400 (AST)
Most fresh tilapia fillets (never frozen) comes from Costa Rica, Ecuador and
a smaller amount from Honduras and Jamaica. One farm in Costa Rica produces
more than 10 million lbs. of tilapia (>3 million lbs. of fillets). Most of
the frozen fillets come from Indonesia, but exports from Taiwan are
increasing. Taiwan is the leading exporter to the U.S., counting all product
forms, with more than 30 million lbs. Jim R.
>I was wondering (and perhaps it was already mentioned here, but I forgot)
>what country raises the tilapia filets we purchase in our grocers deli?
>Since tilapia culture is restricted or tightly regulated in most states, I
>presume that the bulk of what is available now in the US, is imported. From
>where?
>Wendy
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Subject: Re: tilapia origin
From: "TGTX"
Date: Sat, 18 Sep 1999 12:59:56 -0500
> I was wondering (and perhaps it was already mentioned here, but I forgot)
> what country raises the tilapia filets we purchase in our grocers deli?
> Since tilapia culture is restricted or tightly regulated in most states, I
> presume that the bulk of what is available now in the US, is imported.
From
> where?
> Wendy
Countries which import Tilapia to the U.S. include Jamaica, Costa Rica,
Ecuador, and Taiwan. Tilapia is cultured in virtually every southern state
in the U.S., so it is not the regulatory aspect that results in the U.S.
importing more Tilapia than it produces. Rather, it is the low cost of labor
and land and other capital and production costs in these other countries
that allows them to sell the whole and filleted Tilapia at such low prices.
Approximately 25% of all Tilapia grown in the U.S. comes from
California----Solar Aqua Farms has a very big operation there. Archer
Daniels Midland has a large operation going in Urbana(?) Illinois. Then
there is Bioshelter in Amherst Massachusetts that produces about 1 million
lbs of Tilapia a year.
The regulation of Tilapia does not prohibit their successful culture in the
USA, as long as reasonable containment measures are in place. Ironically,
in states like Texas, the only public waters that COULD sustain the growth
of most Tilapia year round due to constant temperature regime from
groundwater spring flow or artificially elevated temperatures such as in
cooling water reservoirs around power plants ALREADY have Tilapia in them.
So the regulations are hardly protecting anything, but it does bring the
state of Texas $250 per year for every Tilapia fish farmer. In most cases
of Tilapia farms that I am aware of the Tilapia would have to sprout legs
and migrate many miles from the farm over prairies and piney woods to pose
any kind of exotic species "threat" to the native fish and aquatic life in
the streams, rivers, and reservoirs that have the constant temperatures that
would permit Tilapia to grow and reproduce. Once they got there, they would
be met by....Tilapia that are already there.
This is a generalization on my part, and I know of important exceptions
especially in far south Texas and near the coast...where the "threat" might
be more realistic...so some protection is called for. But a metal building
or closed greenhouse on a hill in the middle of a prairie with no stream for
miles in the arid, cold, windswept Panhandle is hardly a place to be worried
about the threat of Tilapia invaded local fish species.
Ted
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Subject: large growing operations
From: Adriana Gutierrez & Dennis LaGatta
Date: Sat, 18 Sep 1999 14:25:57 -0400
A seed supplier told me yeserday that she saw some beautiful arugula
growing in ADM's aquaponic facility. Speaking of large operations,
take a look at Sunhouse Farms little operation which produces 1 million
dozen lettuces a year in 70,000 square meters of floating pools.
> Approximately 25% of all Tilapia grown in the U.S. comes from
> California----Solar Aqua Farms has a very big operation there. Archer
> Daniels Midland has a large operation going in Urbana(?) Illinois.
Adriana
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Subject: Re: tilapia origin
From: "Barry Thomas"
Date: Sat, 18 Sep 1999 20:35:57 +0100
> One farm in Costa Rica produces
> more than 10 million lbs. of tilapia (>3 million lbs. of fillets).
So what happens to the other 6 - 7 million lbs?
Barry
barrythomas@btinternet.com
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Subject: unsubscribe
From: randy garman
Date: Sat, 18 Sep 1999 12:43:01 -0700
unsubscribe
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Subject: Re: Root Crops
From: "Jewel Lopez"
Date: Sat, 18 Sep 1999 19:56:49 -0600
I think I read about someone who grew hydroponic carrots well in a 55 =
gallon drum, filled with sand. Anyone ever tried sand?
Hello All,
I have seen potatoes grown in moist straw of about 10 to 14 inches=20
thick over a soil bed.=20
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Subject: Water barrels
From: "Jewel Lopez"
Date: Sat, 18 Sep 1999 19:59:54 -0600
I wanted to mention that because of y2k, Sam's Club has been selling =
food grade plastic 55 gallon water drums for about $22 in our area, just =
in case anyone could use them. They can be used for cheap nutrient =
tanks, etc.. Also, we got a whole bunch of empty 55 gallon steel honey =
barrels from a local factory for $5, and are using them for passive =
solar and growing bed stands.=20
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Subject: Recirc. Marine Systems
From: dreadlox@cwjamaica.com (michael kent barnett)
Date: Sun, 19 Sep 1999 06:30:23 -0700
aquaponics@townsqr.com
Hello all...
Hope you all survived the storms all right, this side of the world.
As I launch out on the fresh water aquaponics route? I would like to
know, does anyone on this group have experience with marine
recirculating systems?
What makes them different in configuration?
Im thinking for the fresh water sys...
Fish tanks
Solid removal section incl. clarifier
further sand filtration if necessary,
growbeds
return....!!
What would be different in the marine system?
Are you saying that I can run a pipe from the sea to some tanks and just
grow in a recirc system? (If so, artemia, food fish, and some crusties
might be interesting for me...)
What would be depleted and how often would I
need to replenish with fresh sea water?
Any bookmarks etc are welcome..
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Subject: Concrete...
From: dreadlox@cwjamaica.com (michael kent barnett)
Date: Sun, 19 Sep 1999 06:55:41 -0700
Noone on this group responded to the questions re modifiers for
concrete...
Another group gave several alternatives for diminishing permeability of
concrete...
The "hottie" seems to be a latex acrylic modifier mixed in before
pouring which will highly improved strength and impermeability.
Has anyone from this group heard of this, in use in fish related tanks
and how has it held up? How are issues like toxicity, and has it been
tried by anyone in this group to make their tanks leakproof?
This is not the liquid liner stuff, this is actually an additive to
chemically modify the concrete!!
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Subject: Re: unsubscribe
From: dreadlox@cwjamaica.com (michael kent barnett)
Date: Sun, 19 Sep 1999 06:57:48 -0700
Mike wrote:
!!!???
I thought crops were over now? :)
Dan Brentlinger wrote:
>
> unsubscribe
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