Aquaponics Digest - Tue 02/22/00
Message 1: Re: Re: Trout, Maron
from Attie Esterhuysen
Message 2: Re: Re: Trout, Maron
from Attie Esterhuysen
Message 3: Turtles
from "Bennett"
Message 4: Re: tilapia in Canada
from Joy Pye-MacSwain
Message 5: Re: Attie's climate
from Ryon Lucke
Message 6: Re: Re: Attie's climate
from Attie Esterhuysen
Message 7: Re: Harvest time
from "Peter D. Rau"
Message 8: Re: Re: Trout, Maron
from "Sam Levy"
Message 9: Re: Trout, Maron
from Adriana Gutierrez & Dennis LaGatta
Message 10: Re: Thank you Ron And Sam
from "beacnhrt"
Message 11: Re: Thank you Ron And Sam
from "beacnhrt"
Message 12: Re: Thank you Ron And Sam
from "beacnhrt"
Message 13: Re: Thank you Ron And Sam
from "beacnhrt"
Message 14: trout , maron
from laberge@cil.qc.ca (LABERGE MARC)
Message 15: crayfish - was - Re: Thank you Ron And Sam
from "Bennett"
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| Message 1 |
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Subject: Re: Re: Trout, Maron
From: Attie Esterhuysen
Date: Tue, 22 Feb 2000 11:04:11 GMT
> i believe that 30 degrees c is pretty much too hot for
trout--what are your
> winter temperatures. if you can get advanced juveniles,
you might raise
> trout in the winter & culture something else that you can
successfully over
> winter & and grow out the other half-year
>
> sam
Sam
Since the relative humidity in summer is very low, I thought
it might be possible to cool down the water temperature by
making use of evaporation. Quite a substantial degree of
cooling will take place if the water is pumped and sprayed
onto the fish ponds. It will serve a dual purpose by
increasing the Oxygen level and decreasing the temperature.
Here follows a table with average maximum -, minimum
temperatures, degree Celsius, and % relative humidity for
the last five years. The relative humidity was measured at
14h00.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
28 28.2 25.4 20.1 16.5 13.4 12.0 14.8 17.5 20.3 21.8 25.3
9.7 10.1 7.5 3.1 0.3 -1.5 -2.1 -1.9 -0.4 0.4 5.2 8.9
23 24 28 32 47 42 44 34 32 30 36 31
Attie
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Subject: Re: Re: Trout, Maron
From: Attie Esterhuysen
Date: Tue, 22 Feb 2000 11:33:29 GMT
> > maybe trout is the answer. Does anybody have experience
with
> > farming Trout combined with lettuce or strawberries?
>
> Welcome Attie,
> The United States Dept of Agriculture Agricultural
Research Station in
> Kearneysville West Virginia has done aquaponic research
using trout
> effluent. They grew both strawberries and lettuce. It
was not a
> recirculating system. They trucked trout effluent to the
facility and
> used it in nutrient film troughs and vertical growing
systems. The
> purpose of their research was to demonstrate the
effectiveness of the
> plants to remove excess nutrients from the trout effluent.
>
> Adriana Gutierrez
> Sarasota, FL
>
Hi Adriana
I think I saw an article on that. Was that the tests
performed by Fumiomi Takeda? The kind man sent me some
information on their system. The results looked very
promising.
Attie
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Subject: Turtles
From: "Bennett"
Date: Tue, 22 Feb 2000 07:52:36 -0500
Is there a market for turtles for meat in the USA? If so, what kinds of
turtles work best?
D.Bennett
> It's good to know about these other fish as the Mayan Method my be
>used anywhere in the world. Of course turtles are also still a possibility.
>There are a couple large growers near here I can talk to.
>
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Subject: Re: tilapia in Canada
From: Joy Pye-MacSwain
Date: Tue, 22 Feb 2000 09:27:02 -0400
LABERGE MARC wrote:
> Not me Ted, I'm not aware of any Tilapia in Québec but one of the members on
> this list grows Tilapia and lettuce just south of Toronto.
And then there is us, Future Aqua Farms, in Chessezetcook, Nova Scotia. We are
growing Tilapia, cucumbers, peppers and basil.
Joy Pye-Macswain
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Subject: Re: Attie's climate
From: Ryon Lucke
Date: Tue, 22 Feb 2000 06:00:23 -0800 (PST)
>
> Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
> 28 28.2 25.4 20.1 16.5 13.4 12.0 14.8 17.5 20.3 21.8 25.3
> 9.7 10.1 7.5 3.1 0.3 -1.5 -2.1 -1.9 -0.4 0.4 5.2 8.9
> 23 24 28 32 47 42 44 34 32 30 36 31
>
> Attie
If I'm doing my temperature conversion correctly (and maybe I'm not), that
temperature chart shows seasonal variations from 30 to 80 Fahrenheit
degrees- sounds pretty nice to me!
Do you live in South Africa, or just southern Africa- I didn't notice
first time around...
_______________________________________________________
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Subject: Re: Re: Attie's climate
From: Attie Esterhuysen
Date: Tue, 22 Feb 2000 14:27:57 GMT
> If I'm doing my temperature conversion correctly (and
maybe I'm not), that
> temperature chart shows seasonal variations from 30 to 80
Fahrenheit
> degrees- sounds pretty nice to me!
> Do you live in South Africa, or just southern Africa-
I didn't notice
> first time around...
Hi Ryon
Yes, I live in South Africa. The temperatures are from my
hometown, Sutherland. I am now living in Cape Town and my
dad is still running the farm. Since it is an arid region, I
was thinking of recycling the water as many times as
possible to try and improve the profitability of the farm.
That is why aquaponics really sounds nice. The temperature
table shows the mean daytime temperatures in the first row,
than the mean night time temperatures. Daytime temperatures
vary between 83 and 54-degree Fahrenheit and the night time
temperatures vary between 50 and 28-degree Fahrenheit.
Attie
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Subject: Re: Harvest time
From: "Peter D. Rau"
Date: Tue, 22 Feb 2000 09:17:16 -0600
Hey Ron,
I live in south Louisiana. We use an electric knife to filet fish. It makes
taking the skin off very easy once you get the hang of it. You start at the
head behind the gill plate and cut to the backbone then turn the knife toward
the tail letting it ride along the backbone. Go almost to the tail, but don't
cut through the skin right before the tail. Flip the filet toward the tail,
then place a couple fingers on the end that is still connected and glide the
electric knife slowly with even pressure and the fillet will come right out of
the skin. We use this technique on everything from red drum, speckled trout,
bass, bream, etc. Hope this helps.
Peter
Ron Brooks wrote:
> Well I started my harvest. And I am averaging one pound nine ounces with a
> ten ounce set of fillets per fish. Next week sometime I will have to run the
> numbers and see how I did on feed conversion. Now my only problem is getting
> the skins off :)I keep sharpening my knife in between each fish side , and
> still those darn skins don't want to let go
>
> Ron
> The One Who Walks Two Paths
> ICQ 44273171
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Subject: Re: Re: Trout, Maron
From: "Sam Levy"
Date: Tue, 22 Feb 2000 07:12:37 PST
attie--
sorry, i didn't register that you're upside down from me.
it seems to me that reccommended water temps for trout are from 10 - 20
degrees c--i'm not a trout farmer my self.
evaporation will cool down the water--and a number of aeration devices will
speed this process up. i'd guess that you'd have to try it (without fish)
to get a picture of what your water temps would drop to.
you also might want to check with trout farms in your country &/or
aquaculture people in the ag ministry.
by the way, are your temperature listings air temps of water temps?
sam
>
>Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
>28 28.2 25.4 20.1 16.5 13.4 12.0 14.8 17.5 20.3 21.8 25.3
>9.7 10.1 7.5 3.1 0.3 -1.5 -2.1 -1.9 -0.4 0.4 5.2 8.9
>23 24 28 32 47 42 44 34 32 30 36 31
>
>Attie
>
>
>
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Subject: Re: Trout, Maron
From: Adriana Gutierrez & Dennis LaGatta
Date: Tue, 22 Feb 2000 12:25:14 -0500
> I think I saw an article on that. Was that the tests
> performed by Fumiomi Takeda?
Yes, I believe he directed the strawberry research.
Adriana
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Subject: Re: Thank you Ron And Sam
From: "beacnhrt"
Date: Tue, 22 Feb 2000 14:09:35 -0600
----- Original Message -----
From: Sam Levy
To:
Sent: Monday, February 21, 2000 9:11 AM
Subject: Re: Thank you Ron And Sam
> It's good to know about these other fish as the Mayan Method my be
used
> anywhere in the world. Of course turtles are also still a possibility.
> >Mel vin Landers
>
>
> just a late thought, but you might manage to do something w/crayfish as
well
>
> sam
>
> ______________________________________________________
> Get Your Private, Free Email at http://www.hotmail.com
>
> Thanks Sam, That may be the best idea of all. Crayfish grow a lot faster
than turtles.
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| Message 11 |
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Subject: Re: Thank you Ron And Sam
From: "beacnhrt"
Date: Tue, 22 Feb 2000 14:15:26 -0600
I don't know about market, but, I do know you don't want to try growing them
commercially. You'll go broke. they take many years to grow to marketable
size and if you are buying food for them you will not like the feed
conversion rate.
----- Original Message -----
From: Bennett
To:
Sent: Monday, February 21, 2000 1:25 PM
Subject: Re: Thank you Ron And Sam
> Is there a market for turtles for meat in the USA? If so, what kinds
of
> turtles work best?
> D.Bennett
>
> It's good to know about these other fish as the Mayan Method my be
> used anywhere in the world. Of course turtles are also still a
possibility.
> There are a couple large growers near here I can talk to.
>
>
>
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Subject: Re: Thank you Ron And Sam
From: "beacnhrt"
Date: Tue, 22 Feb 2000 14:24:16 -0600
Please excuse me, I did't answer your second question. Snapping turtles. But
it takes about seven years to get to ten inches long if you are feeding
them. Not good
if you are trying to make a profit off of them.
----- Original Message -----
From: Bennett
To:
Sent: Monday, February 21, 2000 1:25 PM
Subject: Re: Thank you Ron And Sam
> Is there a market for turtles for meat in the USA? If so, what kinds
of
> turtles work best?
> D.Bennett
>
> It's good to know about these other fish as the Mayan Method my be
> used anywhere in the world. Of course turtles are also still a
possibility.
> There are a couple large growers near here I can talk to.
>
>
>
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Subject: Re: Thank you Ron And Sam
From: "beacnhrt"
Date: Tue, 22 Feb 2000 14:26:07 -0600
That is a good sized crayfish. Do they taste as good as domestic wild ones?
----- Original Message -----
From: Ron Brooks
To:
Sent: Monday, February 21, 2000 9:24 AM
Subject: RE: Thank you Ron And Sam
> That's true , the Australian Red Claw , Cherax quadricarinatus , can get
up
> to a pound an a half
>
> Ron
>
> -> -----Original Message-----
> -> From: aquaponics
> -> [mailto:aquaponics]On Behalf Of Sam Levy
> -> Sent: Monday, February 21, 2000 10:12 AM
> -> To: aquaponics@townsqr.com
> -> Subject: Re: Thank you Ron And Sam
> ->
> ->
> -> It's good to know about these other fish as the Mayan Method
> -> my be used
> -> anywhere in the world. Of course turtles are also still a possibility.
> -> >Mel vin Landers
> ->
> ->
> -> just a late thought, but you might manage to do something
> -> w/crayfish as well
> ->
> -> sam
> ->
> -> ______________________________________________________
> -> Get Your Private, Free Email at http://www.hotmail.com
> ->
> ->
>
>
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Subject: trout , maron
From: laberge@cil.qc.ca (LABERGE MARC)
Date: Tue, 22 Feb 2000 17:34:03 -0500
Attie,
I'm using the raft system, growing romaine lettuce and trout
rainbow at the moment ). I'm very new to aquaponics, learning more
everyday. My unit is a tiny one inside a lab on a fish farm. My water
temperature is 15C, my feed is 40% protein...1% phosphorous. The growing
area is proportional to the daily feed input , I'm using 1 square meter per
57 grams of feed per day ( taken from U.V.I for tilapia at a temperature I
believe is around.25 C). The stocking density at the moment is low since I
am just getting things going but will run at about 40 kg / m3. Disease
remains to be dealt with; my ideal system would have disease certified fish
and using U.V. disinfecting , but at the moment the u.v. is still in the
mail.
I'm hoping to be able to remove my biofilter once the plant cycle gets going
and see weather or not the above ratio of plants ( mainly their roots ) will
provide enough nutrient uptake and biofiltration to keep the system in
equilibrium. I plan to remove fish waste on a daily bases to then return it
into the water in a controlled way trying to get the most out of the waste
while keeping the TSS to a minimum.
I must say though, my plants are taking a long time and I have a feeling
they will rot before reaching maturity. They are placed in empty net pots
supported by a piece of plastic; they keep falling over so I placed half the
plants in clay media and am now comparing. So far the ones in the media seem
to be doing better while the other ones are always lying down most of the
time ( I wish I knew more about these little green things ! ).
Marc Laberge
Mont Tremblant
Qc.,Canada
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Subject: crayfish - was - Re: Thank you Ron And Sam
From: "Bennett"
Date: Tue, 22 Feb 2000 22:53:49 -0500
>That's true , the Australian Red Claw , Cherax quadricarinatus , can get up
>to a pound an a half
>
How long does it take them to get this size? What's the feed conversion
rate for them?
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