Aquaponics Digest - Thu 07/29/99
Message 1: Re: Watercress
from "Sam Levy"
Message 2: Re: RE: Watercress
from "Sam Levy"
Message 3: Re: Watercress
from Joy Pye-MacSwain
Message 4: Call for Abstracts
from Jacky Foo
Message 5: news group
from ranchos@sol.racsa.co.cr
Message 6: Reply to Mary (misc questions and intro)
from atkindw@cwjamaica.com (david w atkinson)
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| Message 1 |
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Subject: Re: Watercress
From: "Sam Levy"
Date: Thu, 29 Jul 1999 01:05:33 PDT
Joy--
remember when comparing feeding rates that the composition of the diet is an
important factor--when comparing feeding programs, i like to compare the
ratios: gram of raw protein/gram of fish-day
gram of lipid (fat)/gram of fish-day
these calculations let me compare the absolute portion being offered in
terms of weight of the major components (i know that people have used
anywhere from 28% protein to 40% protein rations in tilapia farming).
there should also be feed charts available (any manufacturer of feed should
provide one of these for his product--these charts tend to give generous
portions (they're made by the guy who sells the feed) but are good to study
and/or use as you're learning your way).
if you have a growth chart (expected wt over time) & know the what you
expect in feed conversion ratio (FCR) (kg feed/kg gained fish wt)--
you can subtract total initial weight (initial no. * initial wt/fish) from
total final weight (initial no.*survivability*final wt/fish) and multiply
this number by th FCR and know the total amount of feed to be fed over the
calculated period. doing this for short (two week) periods for juveniles
and one month periods for grow-out stage fish should provide enough check
points (weighing a sample of the fish) to see if you're still on target or
should make some changes.
if you want (and have time) to hand feed to satiation all the way through
grow out, you might try giving the next batch about 5-10% less feed and see
how they do.
whichever method you use, it should be one you feel comfortable with and
enjoy working with.
sam
>From: Joy Pye-MacSwain
>My fish are still only fingerlings, about 1.2 g and i am feeding them at a
>rate
>of about
>6% body weight per day (5 satiation feedings per day). I am assuming that
>your
>4%
>rate is for older fish?
>
>Joy
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| Message 2 |
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Subject: Re: RE: Watercress
From: "Sam Levy"
Date: Thu, 29 Jul 1999 01:11:14 PDT
tom-
you can explore the wonderful world of feeders--demand, mechanical,
electronic--either through on-line or print catalogs
sam
>From: Bagelhole1
>Date: Wed, 28 Jul 1999 12:30:49 EDT
>
>
><hours apart starting at 7 am>>
>
>Dear Ron,
>
Isn't there any time saving or less time
>consuming way? Tom O (bagelhole1)
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Subject: Re: Watercress
From: Joy Pye-MacSwain
Date: Thu, 29 Jul 1999 09:33:27 -0300
>
> -> Dear Ron,
> -> This seems like a full time job with overtime, is this
> -> what one needs
> -> to do to keep these fish growing? Isn't there any time saving or
> -> less time
> -> consuming way? Tom O (bagelhole1)
Morning Tom....
Like Ron.... I prefer hand feeding to satiation so that I can keep _very_
accurate records
on how much feed has been consumed on a daily basis and the FCR of my fish.
Part of
the reason I do things that way is because of my background in Fish Health and
far too
many fish feeding trials; but more importantly by hand feeding you become very
familiar
with your animals and their environment- their behavior, their health and can
respond much
earlier to any stresses that your fish may be exhibiting, which ultimately
reduces your animal
losses. Now if you are a bottom line kind of person then minimal wastage of
feed translates
out into dollars saved because you are not just throwing feed onto the bottom of
your tanks
which the fish have no interest in consuming. The other thing that my experience
has shown
me is that by feeding to satiation your fish all grow more evenly .. that is,
smaller fish are
more likely to receive adequate feed as well as the larger more aggressive fish
in the tank
because you take more care to distribute feed to them as well... this translates
out into
fish that grow to market size more quickly. Now don't get me wrong... I am not
knocking
automatic feeders.... for time constraints in large facilities they are the only
way to go, but
if you have a smaller operation then......
As to Ron's 6 feedings versus my 5 feedings per day at 3 hours apart... to tell
the truth the I
am _not_ a morning person!!! So I start my feedings at 10:00 AM and do every 3
hours from
there...... :) :) if I ever get better at doing mornings then......
Anyway, whatever system of feeding you choose to do, frequent daily observation
of your animals
is your wisest course of action. Good luck
Joy
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Subject: Call for Abstracts
From: Jacky Foo
Date: Thu, 29 Jul 1999 14:57:52 +0200
Thank you Charlie Shultz for forwarding the CALL FOR ABSTRACTS of the
Internet Conference on Material Flow Analysis of Integrated Bio-Systems
(March-Oct 2000) to this list.
Aquaponics (aquaculture and plants) uses the principles of integrated
bio-systems and so I hope that members from this list will take the
opportunity to present your work at this Internet Conference. The themes
where papers on aquaponics are most welcomed are:
1) Wastewater Treatment and Utilisation Systems
2) Integrated Aquaculture Systems
3) Large Plantations, Farms and Feedlots
4) Constructed Building Complex, greenhouse and Eco-house Systems
Here are some examples where you can present a paper on the material flows
(water, feed, energy in oil equivalents) of your system -
(1) the most basic is water. In a linear system water goes in and out of
the system. Water recycling means savings and money. You need to filter,
clean and remove accumulated dissolved nutrients. Plants can do all these.
So a simple paper would be a material flow of water (inflow, losses and
recovery) and how much space and plants you use/need to remove the
dissolved nutrients from the water.
2) Another material flow is the biomass production. You put in feeds, and
you get out fish. Where does the remaining go ? An metrail flow analysis
can help you improve your productivity and increase income. If 60 % of the
feed is still in the water, how do you recover this money with an
integrated bio-system. Do you use plants to absorb the nutrients ? algae
can be used as fish feeds. Is the nutrients recovered as a plant produce
like tomatoes, herbs, etc.? If you are already doing these, it would not be
difficult to construct a material flow chart.
3) Many aquaponic systems are housed in greenhouses. Some are integrated in
or on homes and buildings where activities in such strcutures are
integrated with it.
PROCEDURE FOR SUBMISSION OF ABSTRACTS
An abstract should not be more than 1 page in size and may contain text,
table, diagrams. It should include title of paper, full name(s) and postal
and email address(es) of author(s), abstract and keywords. Authors should
wait for formal notification of acceptance
before proceeding into preparation of the full papers. Full papers need to
have a minimum of 4 pages in text and at least on diagram to show the
material flow. The deadline for the 1st Call for Abstracts is Oct 31, 1999.
A 2nd Call for Abstracts will be made at a later date, if needed.
The conference homepage is under construction
(http://www.ias.unu.edu/proceedings/icibs/ic-mfa/) and if it does not
answer all your questions, please do not hestitate to write to me.
A special feature which we hope to offer is that you can put a video clip
of your system on the web. This will facilitate the presentation of your
paper as well as encourage discussions.
regards
jacky
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| Message 5 |
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Subject: news group
From: ranchos@sol.racsa.co.cr
Date: Thu, 29 Jul 1999 09:53:19 -0600
Hi:
Please include me in your email news group list.
Jose
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| Message 6 |
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Subject: Reply to Mary (misc questions and intro)
From: atkindw@cwjamaica.com (david w atkinson)
Date: Thu, 29 Jul 1999 23:14:28 -0500
I promised in my last post to Mary's question about the greenhouse, that I
would give her & the list the benefit of the URL when I find it in my
archive. Well, ... I have not found it. However, I am not one to
disappoint my 'promissees' :-)
Below is a small list of URL's that may give you all some ideas about
building the greenhouse structures yourselves and saving some of that
precious money.
http://www.radixinc.com/greenhouse/greenhouse-plans.html
http://www.suite101.com/article.cfm/greenhouse/17040
http://www.littlegreenhouse.com/
http://www.agroponic.com/News%20Releases/sf_pack_plans.htm
http://www.screen-house.com/greenhouse_plans.htm
http://www.hoophouse.com/
Happy building folks! :-)
David Atkinson (from Jamaica West Indies)
You wrote in a previous post:
Thanks,
I would be interested. I will be watching for information.
Mary
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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