Aquaponics Digest - Fri 01/29/99
Message 1: Re: aquaponic swimming pool
from "Fred Chambers, FMChambers@CSUPomona.edu"
Message 2: Re: Norman's Drain
from "Sam Levy"
Message 3: Re: Pacu
from Gordon Watkins
Message 4: Stupid Question
from Michael Strates
Message 5: Re: Stupid Question
from Michael Strates
Message 6: Re: Stupid Question
from William Evans
Message 7: Re: Stupid Question
from doelle
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Subject: Re: aquaponic swimming pool
From: "Fred Chambers, FMChambers@CSUPomona.edu"
Date: Thu, 28 Jan 1999 21:29:07 -0800
Hey y'all,
All of our ponds are aquaponic, with plants like hyacinth, duck weed,
azola, Chinese water spinach a.k.a. Kang Kong, and watercress floating on
top of a portion of the ponds. With reclaimed water, we have a rich supply
of nitrogenous compounds that make algae go like gangbusters. The floating
plants perform several functions:
Shade - The algae can't all be in the sun all the time. By shading, we
dampen or moderate runaway photosynthesis;
Substrate - The undersides of floating plants is dark, and perfect for
nitrogen-fixing bacteria. By providing a dark habitat for bacteria, they
help take nitrogenous compounds out of the water. Fish also graze on the
globs of bacteria, feeding themselves.
Biomass - As the plants grow, they use the Nitrogen to build lush foliage.
We harvest the excess biomass periodically, some for human food, some for
animals, and some for compost/vermiculture.
The algae also consumes the nitrogenous wastes as they grow. Planktivorous
fish like tilapia and silver carp graze the larger zooplankton and
phytoplankton, keeping the populations close to their maximum sustainable
yeild.
By flushing about 10-20% of the pond, refilling with new reclaimed water,
we can keep the algal bloom up, providing the majority of the nutrients for
the fish.
And students swim or wade in the luxuriant green water too!
Our effluent flows into a constructed wetland with emmergent plants before
flowing into a groundwater recharge area. The water flowing into the
recharge area meets or exceeds all Calfironia safe drinking water
standards. We should probably bottle it up, or make beer with it, but
we're pretty busy...
Green water is beautiful!
Fred
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Subject: Re: Norman's Drain
From: "Sam Levy"
Date: Thu, 28 Jan 1999 13:06:08 PST
If this type of drain filter is fitted with an air collar at its base,it
tends to need less cleaning. Also, depending on species & length of
time the larvae/fry will be in the tank, it may be appropriate to
prepare sleeves of different sized netting so that the size of the
filter grows along with the fish. (Generally, the water level would be
lowered below the bottom of the filter's frame during a change of
netting.)
I'm new to the list, but have used a variety of filters for
larval-juvenile tanks based on the same principles.
sam
Here is a
>suggestion for filter device for the fry tank outlet, to prevent fish
fry
>sucked in by the drain. Please see the attached diagram. Good luck.
>Norman Chwang
>
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Subject: Re: Pacu
From: Gordon Watkins
Date: Fri, 29 Jan 1999 13:58:15 -0600
Unfortunately, my remaining few Pacu (@ 2.5+ lbs each) were lost in my
recent bout
with ich and I haven't yet restocked. They're really too expensive to purchase
through a pet supplier, even with the deep discounts I can usually finagle,
but I've
got a lead on a supplier in Miami connected with Projecto Pacu, a large pacu
aquaculture project in Puerto Rico. As I understand it, they sell several
different
Collosoma sub-species, including some which reach 20 lbs!. As soon as the
weather
moderates a little I plan to order a box of fingerlings. I'll keep you posted.
Gordon
ps: Thanks for the overview of cichlid filtration methods. I use home made
trickle
filters on several grow-out and display tanks and find that they perform
best and
allow the greatest stocking densities.
Chris Hedemark wrote:
> So are you working with pacu in commercial production numbers yet or
> still experimenting? I'd like to hear more about it.
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Subject: Stupid Question
From: Michael Strates
Date: Sat, 30 Jan 1999 21:56:42 +1100 (EST)
Hi,
Just a stupid off-topic question.. Would feeding a compost pile 100% pure
O2 accelerate the growth of anerobes and increase the production of heat??
I have a membrane which removes the nitrogen from the air (cost $90..
worth it.. I use it for filling nitrox dive cylinders) and produces around
a 90% pure O2 mixture. Apart from the fire risk, would giving the bin pure
O2 accelerate anything, or does pure O2 become toxic over long periods of
time to the aerobes like it does to us?
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Subject: Re: Stupid Question
From: Michael Strates
Date: Sat, 30 Jan 1999 23:40:11 +1100 (EST)
On Sat, 30 Jan 1999, Michael Strates wrote:
MS> Just a stupid off-topic question.. Would feeding a compost pile 100% pure
MS> O2 accelerate the growth of anerobes and increase the production of heat??
^^^^^^^^
aerobes
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Subject: Re: Stupid Question
From: William Evans
Date: Fri, 29 Jan 1999 17:58:34 -0800
Michael Strates wrote:
>
> Hi,
>
> Just a stupid off-topic question.. Would feeding a compost pile 100% pure
> O2 accelerate the growth of anerobes and increase the production of heat??
> NO , it wood kill th anerobes and make the aerobes thrive , to a point.
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Subject: Re: Stupid Question
From: doelle
Date: Sat, 30 Jan 1999 14:17:37 +1100
Pure oxygen is poisonous to the bacteria. Certainly anaerobes will not grow,
but you are also in danger of killing all aerobes and thus finish up with a
somewhat sterile compost heap.
Aeration is much better, as air is, of course, not pure oxygen and thus can
be tolerated by some facultative anaerobes and certainly by aerobes.
It all depends what you are after.
Horst Doelle
Horst W.Doelle, D.Sc., D.Sc. [h.c.]
Chairman, IOBB
Director, MIRCEN-Biotechnology
FAX: +617-38783230
Email: doelle@ozemail.com.au
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