From: Jean-Pierre Marquet [mailto:jp_marquet@hotmail.com]
Sent: 28 March 2013 18:07
To: sarnissa-african-aquaculture Mailing List
Subject: RE: [Sarnissa] Potential for Periphyton

> From: d.c.little@stir.ac.uk
> To: sarnissa-african-aquaculture@lists.stir.ac.uk
> Date: Thu, 28 Mar 2013 14:38:31 +0000
> Subject: Re: [Sarnissa] Potential for Periphyton
>
> Interesting discussion everyone. The costs of using biomass on the scale required is usually ignored or underestimated. In many energy limiting contexts (many densely populated LDCs) biomass has a real and immediate value as a fuel and the opportunity cost for its use in a pond is considerable-this is quite apart from the labour considerations already mentioned.
> Best wishes
> Dave
>
> -----Original Message-----
> From: sarnissa-african-aquaculture-bounces@lists.stir.ac.uk [mailto:sarnissa-african-aquaculture-bounces@lists.stir.ac.uk] On Behalf Of Warren A. Turner
> Sent: 28 March 2013 01:57
> To: sarnissa-african-aquaculture Mailing List
> Subject: Re: [Sarnissa] Potential for Periphyton
>
> Hi All,
>
> Trying to increase surface area to provide periphyton is labour-intensive, impractical and I don't think it will have a huge effect on growth and yield. It may only be useful in the case that bamboo sticks and thorny bushes are put in the pond as a method primarily to deter thieves. The best way to increase yield and growth is to fertilize the pond with 4 kg of nitrogen and 1-2 kg of phosphorous per ha per day. This will create "green water" consisting of phytoplankton high in protein. This can be eaten directly by tilapia and will also feed zooplankton which in turn provide food for the fish. In addition, the phytoplankton produces oxygen and removes nitrogenous waste products produced by the fish.
>
> Best regards
>
> Warren
>
> -----Original Message-----
> From: sarnissa-african-aquaculture-bounces@lists.stir.ac.uk
> [mailto:sarnissa-african-aquaculture-bounces@lists.stir.ac.uk] On Behalf Of James Miller
> Sent: Wednesday, March 27, 2013 2:05 AM
> To: sarnissa-african-aquaculture@lists.stir.ac.uk
> Subject: Re: [Sarnissa] Potential for Periphyton
>
> Hello Everyone,
>
> Periphyton or awfwuks was studied at Auburn University back in the 70's as a way to increase natural production in ponds. But as Jerome noted, even though bamboo sticks or other means can be used to increase surface area substrate for attachment and growth of periphyton in ponds, use of such sticks in ponds is very impractical as the ponds need to be sampled and harvested, which is impossible with bamboo or sticks everywhere.
>
> The use of Acajas to increase fish production in the lagoons in Benin represents in effect another use of periphyton, but this traditional method of increasing production isn't being used much now....it has had negative impact on the forest and vegetation around lagoons. I am not up to date on this.
>
> Note that some aquaculture systems use small areas to rear fish or other organisms and use a larger area for substrate and increased production.
> Someone from Asia needs to comment on the lab lab in ponds there.
>
> Best regards,
>
> Jim Miller
>
> On 3/26/13, Frimpong, Emmanuel <frimp@vt.edu> wrote:
> > It may be the result of the usual failure to couple research with
> > effective outreach/extension/dissemination, so the knowledge just
> > resides at the research stations. Otherwise, the constraint Jerome
> > identifies also seems significant to inhibit adoption.
> >
> > Emmanuel Frimpong
> >
> > From: sarnissa-african-aquaculture-bounces@lists.stir.ac.uk
> > [mailto:sarnissa-african-aquaculture-bounces@lists.stir.ac.uk] On
> > Behalf Of Jerome Lazard
> > Sent: Tuesday, March 26, 2013 12:33 PM
> > To: sarnissa-african-aquaculture@lists.stir.ac.uk
> > Subject: Re: [Sarnissa] Potential for Periphyton
> >
> > The concept of implementing bamboos in ponds and pens to stimulate the
> > production of periphyton is now more than 20 years old and, to my
> > knowledge, started in Côte d'Ivoire (Hem Saurin et Avitt, 1995). Since
> > that time a quite large number of scientists (and projects) have been
> > refining the technique and many publications came out from these works.
> > Now the question is: how many farmers do use this technique on their
> > farm for their own production? During the many travels I have had the
> > opportunity to achieve in tropical countries, I do not remember even
> > once having seen such devices ...... except in research stations. Have
> > I missed something?
> > Best regards,
> > Jérôme Lazard
> > PS In Côte d'Ivoire, a major constraint was the need to remove (and
> > re-implement) the bamboos every time the farmer had to use a net to
> > fish his pond (pen).
> >
> > De :
> > sarnissa-african-aquaculture-bounces@lists.stir.ac.uk<mailto:sarnissa-
> > african-aquaculture-bounces@lists.stir.ac.uk>
> > [mailto:sarnissa-african-aquaculture-bounces@lists.stir.ac.uk] De la
> > part de William Leschen Envoyé : mardi 26 mars 2013 15:59 À :
> > sarnissa-african-aquaculture Mailing List Objet : [Sarnissa] Potential
> > for Periphyton
> >
> > Thank you Peter
> >
> > On the same lines see attached and links the work of Ekram Azim on
> > periphyton in ponds in Bangladesh
> >
> > https://www.was.org/Documents/MeetingPresentations/AQUA2006/WA2006-734
> > .pdf
> >
> > http://books.google.co.uk/books?hl=en&lr=&id=n9Ym8vb85IAC&oi=fnd&pg=PR
> > 15&dq=Ekram+azim+periphyton&ots=WIm7yWQ15i&sig=AmP40g7jxAqdAOSnWLoW4Cd
> > r9oA#v=onepage&q=Ekram%20azim%20periphyton&f=false
> >
> > Best wishes Will
> >
> > PS Apologies at present we've been having some technical issues with
> > main www.sarnissa.org<http://www.sarnissa.org> website in last few
> > days but hope to get it up and working again soon
> >
> > From:
> > sarnissa-african-aquaculture-bounces@lists.stir.ac.uk<mailto:sarnissa-
> > african-aquaculture-bounces@lists.stir.ac.uk>
> > [mailto:sarnissa-african-aquaculture-bounces@lists.stir.ac.uk] On
> > Behalf Of Peter Corey
> > Sent: 26 March 2013 14:14
> > To: sarnissa-african-aquaculture Mailing List
> > Subject: Re: [Sarnissa] FISH HARVEST IN AMAGORO CONSTITUENCY, TESO
> >
> > Along the same lines as Neil's comment, it was pointed out to me by
> > friends in DR Congo that the practice of boosting periphyton
> > productivity using artificial substrate (e.g. bamboo, plastic) not
> > only has the benefit of increasing availability of natural feed for
> > the fish, but it can also discourage theft since it makes it so
> > difficult
> to sein the pond.
> > A couple of documents are attached on this topic.
> >
> > Peter Corey, MSc
> > http://fishforhope.blogspot.ca
> >
> >
> > From:
> > sarnissa-african-aquaculture-bounces@lists.stir.ac.uk<mailto:sarnissa-
> > african-aquaculture-bounces@lists.stir.ac.uk>
> > [mailto:sarnissa-african-aquaculture-bounces@lists.stir.ac.uk] On
> > Behalf Of Neil at Fish Designs Office
> > Sent: Tuesday, March 26, 2013 7:33 AM
> > To: 'Shimbetu Mweemba';
> > sarnissa-african-aquaculture@lists.stir.ac.uk<mailto:sarnissa-african-
> > aquaculture@lists.stir.ac.uk>
> > Subject: Re: [Sarnissa] FISH HARVEST IN AMAGORO CONSTITUENCY, TESO
> >
> > A suggestion to reduce theft is to place bundles of old barbed wire
> > into the ponds in areas where the farmer knows they are. At harvesting
> > they can be removed but at night for unsuspecting thieves they will
> > prove to be a challenge.
> >
> > Cheerio
> >
> > Neil
> >
> > [cid:image001.jpg@01CE2A22.25307370] ...fish for the future
> >
> > Mobile: +27(0)82 893 8252
> >
> > Office: +27(0)82 873 3166
> >
> > Fax: +27(0)86 555 0479
> >
> > Email: info@fishdesigns.co.za<mailto:info@fishdesigns.co.za>
> >
> > Web:
> http://www.fishdesigns.co.za<http://www.fishdesigns.co.za/>
> >
> >
> > From:
> > sarnissa-african-aquaculture-bounces@lists.stir.ac.uk<mailto:sarnissa-
> > african-aquaculture-bounces@lists.stir.ac.uk>
> > [mailto:sarnissa-african-aquaculture-bounces@lists.stir.ac.uk] On
> > Behalf Of Shimbetu Mweemba
> > Sent: 26 March 2013 03:12 AM
> > To:
> > sarnissa-african-aquaculture@lists.stir.ac.uk<mailto:sarnissa-african-
> > aquaculture@lists.stir.ac.uk>
> > Subject: Re: [Sarnissa] FISH HARVEST IN AMAGORO CONSTITUENCY, TESO
> >
> > Thanks for a very encouraging result. However, it is really sad for
> > the farmer and i do not know why harvesting days are always sad ones
> > for the farmers. It is almost always that numbers are less due to
> > theft like in this case or due to unseen mortalities when fries are
> > stocked. It is very discouraging for the farmers but as technocrats we
> > should always endeavor to provide practical intervations in order to
> > reduce loss of inputs by our farmers. I can assume that, that farmer
> > was still basing his feeding rations on very wrong numbers.
> >
> > Consistent sampling in most cases gives a good indicator of what is
> > happening in a pond such as stock and growth rate. If for example, one
> > single seining you catch 100 pieces and the next time you do it you
> > get 5 then definately something is wrong with the stock. I hope the
> > farmer and the extension officer will do better next time as
> > experience is the best teacher.
> > thanks
> >
> > From: Sarah Gitta <nakagitta@gmail.com<mailto:nakagitta@gmail.com>>
> > To:
> > sarnissa-african-aquaculture@lists.stir.ac.uk<mailto:sarnissa-african-
> > aquaculture@lists.stir.ac.uk>
> > Sent: Monday, March 25, 2013 7:59 PM
> > Subject: Re: [Sarnissa] FISH HARVEST IN AMAGORO CONSTITUENCY, TESO
> >
> > Thanks for the report. It is so encouraging, will share with my
> > upcoming farmers.
> >
> > Sarah
> > On Mon, Mar 25, 2013 at 11:39 AM, Walubita Nasilele
> > <wnasilele9@gmail.com<mailto:wnasilele9@gmail.com>> wrote:
> > Very encouraging report, however sad that theft reduced the returns,
> > this should be looked into in the next cycle.
> >
> > On 3/25/13, Emilie Devic
> > <e.d.devic@stir.ac.uk<mailto:e.d.devic@stir.ac.uk>>
> > wrote:
> >> Dear all,
> >>
> >> For your information, please find attached the report of the fish
> >> harvested from Mr. James Paddy of Osajai cluster in Teso North
> >> District.
> >>
> >> Best wishes,
> >>
> >> Emilie Devic
> >> Inst. of Aquaculture
> >> University of Stirling, UK
> >>
> >> --
> >> The University of Stirling is ranked in the top 50 in the world in
> >> The Times Higher Education 100 Under 50 table, which ranks the
> >> world's best 100 universities under 50 years old.
> >> The University of Stirling is a charity registered in Scotland,
> >> number SC 011159.
> >>
> >>
> > _______________________________________________
> > Sarnissa-african-aquaculture mailing list
> > Sarnissa-african-aquaculture@lists.stir.ac.uk<mailto:Sarnissa-african-
> > aquaculture@lists.stir.ac.uk>
> > http://lists.stir.ac.uk/cgi-bin/mailman/listinfo/sarnissa-african-aqua
> > culture
> >
> >
> > _______________________________________________
> > Sarnissa-african-aquaculture mailing list
> > Sarnissa-african-aquaculture@lists.stir.ac.uk<mailto:Sarnissa-african-
> > aquaculture@lists.stir.ac.uk>
> > http://lists.stir.ac.uk/cgi-bin/mailman/listinfo/sarnissa-african-aqua
> > culture
> > ________________________________
> > The University of Stirling is ranked in the top 50 in the world in The
> > Times Higher Education 100 Under 50 table, which ranks the world's
> > best 100 universities under 50 years old.
> > The University of Stirling is a charity registered in Scotland, number
> > SC 011159.
> >
> >
> >
>
>
> --
> Jim Miller
> Team Leader
> SOFRECO/World Bank
> Value Chain Development Project
> Hargeisa, Somaliland
> Tel: 00252 2 484 9394
> E-mail: jimfishafrica@gmail.com
> james.miller@sofreco.biz
> Skype: millerfishafrica
> Skype: millerfishafrica
>
>
>
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> e
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>
> _______________________________________________
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>
> --
> The University of Stirling is ranked in the top 50 in the world in The Times Higher Education 100 Under 50 table, which ranks the world's best 100 universities under 50 years old.
> The University of Stirling is a charity registered in Scotland,
> number SC 011159.
>
>
> _______________________________________________
> Sarnissa-african-aquaculture mailing list
> Sarnissa-african-aquaculture@lists.stir.ac.uk
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