6 Mar
2010
6 Mar
'10
10:14 a.m.
Traduit du forum anglais
De: sarnissa-african-aquaculture-bounces(a)lists.stir.ac.uk [mailto:
sarnissa-african-aquaculture-bounces(a)lists.stir.ac.uk] De la part des quais, ALR
<adrianp(a)sun.ac.za >
Sent: 06 Mars 2010 09h56
To: sarnissa-african-aquaculture Mailing List
Subject: Re: [Sarnissa moines-african-aquaculture] et de bornes-fontaines
Cher Raymond,
Je voudrais apporter une précision ici. Un moine n'est pas simplement un moyen de
drainer les étangs, il a une triple fonction.
1. Niveau de contrôle
2. Drainage Pond, et
3. Dépassement de la protection
La dernière étant la plus importante. Avec les pluies ici présents en Ouganda, il démontre
mon point. Si les tuyaux sont utilisés pour le drainage, un déversoir séparé doit encore
être ajouté à n'importe quel bien construit étang. Si les coûts sont additionnés, un
tuyau plus un évacuateur de crues est toujours plus cher qu'un moine.
Adrian Piers, African Fish Ltd
Rédacteur du bulletin, de l'Aquaculture Association d'Afrique australe et
Aquaculture Institute d'Afrique du Sud
Téléphone + +27 21 808 3712
Mobile + +27 (0) 73 264 4280
From: sarnissa-african-aquaculture-bounces(a)lists.stir.ac.uk
[mailto:sarnissa-african-aquaculture-bounces@lists.stir.ac.uk] On Behalf Of Piers, ALR
<adrianp(a)sun.ac.za>
Sent: 06 March 2010 09:56
To: sarnissa-african-aquaculture Mailing List
Subject: Re: [Sarnissa-african-aquaculture] monks and standpipes
Dear Raymond,
I would like to make a clarification here. A monk is not simply a means of draining ponds,
it has a threefold function.
1. Level control
2. Pond drainage, and
3. Overflow protection
The last being one of the most important. With the present rains here in Uganda it
demonstrates my point. If pipes are used for drainage, a separate spillway still needs to
be added to any well constructed pond. If the costs are added up, a pipe plus a spillway
is invariably more expensive than a monk.
Adrian Piers, African Fish Ltd.
Newsletter Editor, Aquaculture Association of Southern Africa and
Aquaculture Institute of South Africa
Phone ++27 21 808 3712
Mobile ++27 (0) 73 264 4280
From: sarnissa-african-aquaculture-bounces(a)lists.stir.ac.uk
[mailto:sarnissa-african-aquaculture-bounces@lists.stir.ac.uk] On Behalf Of Raymond
Mwangata
Sent: 06 March 2010 10:30 AM
To: sarnissa-african-aquaculture(a)lists.stir.ac.uk
Subject: Re: [Sarnissa-african-aquaculture] monks and standpipes
thanks for your observation.but i would relate this to the cost of the two.most of the
ponds am seeing in east Africa are semi intensive systems and are owned by small scale
fish farmers at subsistence level.this therefore translates the fact that its cheaper to
get a 2 meter PVC pipe as drainage structure compared to a monk which requires building
materials and cost of labour which most farmers can not afford.
regards,
Raymond
Ministry of fisheries development.
Nakuru fisheries station
Rifty valley region.Kenya.
cell: +254722902914
Date: Fri, 5 Mar 2010 16:07:06 -0600
From: veverkl(a)gmail.com
To: sarnissa-african-aquaculture(a)lists.stir.ac.uk
Subject: [Sarnissa-african-aquaculture] monks and standpipes
Dear all,
In the early 1980's we made a training manual for fish farming in Rwanda
and one of the tables in the manual gave a comparison between monks and
PVC standpipes as drainage structure for fish ponds. It also offered
the cut-levee option for pond draining. In Kenya, we made a comparison
between standpipes inside the pond and standpipes outside the pond
during the various pond construction training programs that were held.
As I look at the information coming out of West Africa, and from other
visits, I see that the fish ponds still have monks and some of the newly
constructed ponds use monks. Whereas in East Africa, almost all of the
fish ponds have switched to PVC standpipes as drains, except for very
large ponds, where a monk-type drainage structure is often less expensive.
There are certain construction principles that must be followed for each
and if they are not, then the functionality is severely compromised. I
am wondering, however, why it is that there is such a difference between
West Africa and East Africa; or is it only my imagination?
Regards to all,
Karen
Karen L. Veverica
Department of Fisheries and Allied Aquacultures
Auburn University, AL
office: +1-334-844-4667
cell: +1-334-332-1560
cell in Uganda: +256 782-970622
http://www.ag.auburn.edu/fish/international/uganda
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