Aquaponics Digest - Wed 09/22/99
Message 1: unsubscribe
from "Tunji Ladoja"
Message 2:
from
Message 3: re: floating feces
from S & S Aqua Farm
Message 4: Re:
from "Sam Levy"
Message 5: Looking for tilapia in California
from Bagelhole1
Message 6: Re:
from "Barry Thomas"
Message 7: Re: FFF (floating fish feces)
from Adriana Gutierrez & Dennis LaGatta
Message 8: Re: Looking for tilapia in California
from William Evans
Message 9: Re: Looking for tilapia in California
from William Evans
Message 10: Re:
from "Barry Thomas"
Message 11: Re: organic certification Hawaii aquaponics and permaculture
from "KevinLReed"
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| Message 2 |
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Subject:
From:
Date: Wed, 22 Sep 1999 7:33:07 + 5 EST
Thanks for the levity.....
But, ultimately does anyone know the answer to the great feces debate! Not
to be rude, but I think
it has merit, since we ultimately want to be able to "grind up" the feces
and use it for our plants. It
will float forever - never sinks and ultimately has to be skimmed off. Too
bad I will be forced to ask
my students to conduct an experiment without any prior research since many
think this is some
kind of joke. It really does happen!
Maybe my students will have an explanation! Keep You Posted!
Mike
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| Message 3 |
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Subject: re: floating feces
From: S & S Aqua Farm
Date: Wed, 22 Sep 1999 06:37:09 -0500
At 07:33 AM 09/22/1999 EST, Mike wrote:
I think
>it has merit, since we ultimately want to be able to "grind up" the feces
and use it for our plants. It
>will float forever - never sinks and ultimately has to be skimmed off.
Mike - what is the brand/type of feed you're using that causes this? Can
you give us a list of ingredients off the packaging? Perhaps that will
bring something to light.
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:
From: "Sam Levy"
Date: Wed, 22 Sep 1999 07:37:25 PDT
mike--
i actually gave some thought to your question---
in general, fish feces is considered to be roughly the same specific gravity
as the culture water hence the difficulty in separating it out.
the main difference between any two aquafeeds will be the constituent
ingredients
the differences between a floating & sinking feed are:
**the amount of air entrapped in the pellet (that's why it floats)
**the state of the carbohydrate (the cooked starches are what hold the
floating pellet together)
i would guess one of two things is happening:
either the constiuent feedstuffs are different & result in different
"leftovers" OR because the floating feed is less dense, the fish are eating
more volume (in order to reach their energy requirement) in a shorter time
span & the tale end of the digestive tract is simply packing the material
more densely.
don't know that i've cleared up much for you, but at least i've tweezed it
out of my thoughts.
sam
>From:
>But, ultimately does anyone know the answer to the great feces debate!
>
>
>Mike
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| Message 5 |
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Subject: Looking for tilapia in California
From: Bagelhole1
Date: Wed, 22 Sep 1999 11:42:55 EDT
In a message dated 9/18/99 7:04:40 PM, ground@thrifty.net writes:
<>
Dear Ted,
My search engine turned up nothing for this, do you have a url?
Thanks,
Tom O
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Subject: Re:
From: "Barry Thomas"
Date: Wed, 22 Sep 1999 16:54:35 +0100
Mike,
The only thing I can think of is that maybe the sinking pellets have
different kinds of oils/fats from those that float and that a larger
proportion of these oils/fats are passing through the fish undigested?
Or something else in the sinking feed is interfering with proper
digestion of fats it contains? Do the fish themselves seem affected in
any other way?
Have you tried any other sinking feeds? Same result?
If, as Paula suggests, you could post the ingredients, someone on the
list is more likely to be able to help.
Barry
barrythomas@btinternet.com
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Subject: Re: FFF (floating fish feces)
From: Adriana Gutierrez & Dennis LaGatta
Date: Wed, 22 Sep 1999 12:17:05 -0400
Mike,
Have you considered giving Purina or whoever makes your feed a call with
this question?
Adrian
>
> i actually gave some thought to your question---
> in general, fish feces is considered to be roughly the same specific gravity
> as the culture water hence the difficulty in separating it out.
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| Message 8 |
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Subject: Re: Looking for tilapia in California
From: William Evans
Date: Wed, 22 Sep 1999 10:44:33 -0700
Try (AFT)Aqua Farming Tech, Inc.
...attn Rocky French
89635 Ave 81
Thermal , CA 92274
ph 760 397 0609
...consulting , design,construction, production technology
note: 5 tons a week production- sold live to LA for $2.50 a pound- no 69
cents a pound frozen product here(Taiwan product),,, and a sample-15 pounds-
was yummy-traded some salsa and garden veggies...
also catfish,and carp
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| Message 9 |
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Subject: Re: Looking for tilapia in California
From: William Evans
Date: Wed, 22 Sep 1999 10:44:43 -0700
Try (AFT)Aqua Farming Tech, Inc.
...attn Rocky French
89635 Ave 81
Thermal , CA 92274
ph 760 397 0609
...consulting , design,construction, production technology
note: 5 tons a week production- sold live to LA for $2.50 a pound- no 69
cents a pound frozen product here(Taiwan product),,, and a sample-15 pounds-
was yummy-traded some salsa and garden veggies...
also catfish,and carp
billevans
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| Message 10 |
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Subject: Re:
From: "Barry Thomas"
Date: Wed, 22 Sep 1999 19:06:49 +0100
Sam,
> mike--
>
> i actually gave some thought to your question---
> in general, fish feces is considered to be roughly the same specific
gravity
> as the culture water hence the difficulty in separating it out.
Is there a difficulty? I had assumed that most of the solids sank and
that it was mainly dissolved wastes which were applied to the plants,
with the sludge at the bottom pumped out for other treatment.
What seperation methods are most used? Settling tanks? Mechanical
filters?
Is it possible to use the "Vortex" type filters (as used in
incinerators, sawmills, bagless vacuum cleaners etc.) with water? Anyone
know of any in use?
I read somewhere about an algae farm that NASA were playing with. Their
problem was to seperate one particular species of algae from several
others. They solved it by feeding the culture onto a rotating tray. Due
to the fact that the different species have slightly different masses,
they collect into high concentration bands. A scoop can then be
positioned (servo-driven in their case) to remove only the desired
species.
Perhaps something similar could be used for seperation in aquaponics?
Maybe it already is? You could stack a number of trays on the same
spindle to increase throughput.
Barry
barrythomas@btinternet.com
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| Message 11 |
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Subject: Re: organic certification Hawaii aquaponics and permaculture
From: "KevinLReed"
Date: Wed, 22 Sep 1999 21:39:17 -0700
Gordon,
Those were very sound thoughts about certification. I will be selling
in a low income area and it will be some time before we are shipping
out of the area. We will be doing the vertical integration that many
from this group do ... grow, process, package, etc. You are right, a few
questions and a walk around the greenhouses will do more to convince
customers of our quality any certification will do at this point in =
time.
Thanks,
Kevin
-----Original Message-----
From: Gordon Watkins
To: aquaponics@townsqr.com
Date: Tuesday, September 21, 1999 3:40 PM
Subject: Re: organic certification Hawaii aquaponics and =
permaculture
Kevin,
Regarding the cost/benefits of certification, it all depends on =
your marketing plans ....
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