FW: Potential for Periphyton - Sarnissa-french-aquaculture

28 Mar 2013

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

Hi all,

Please, give a look at this short video: it demonstrate how some fishes can be easily 
caught  with a basket full of leaves and branches in south west DRC (a traditional method
around Sandoa,  I've reported on DVD). It is  the same for acadja: fishes are
interested to be hidden and concentrated in protected enclosure and not essentially for
eating periphyton...It is the reason why some harvest report in acadja are so optimistic
and why fishermen around are desapointed.

Regards

Jean-Pierre Marquet

...
  From:
d.c.little@stir.ac.uk<mailto:d.c.little@stir.ac.uk>
 To:
sarnissa-african-aquaculture@lists.stir.ac.uk<mailto: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>
[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>
 [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<mailto: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<mailto: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>
 [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<mailto: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-<mailto:sarnissa-african-aquaculture-bounces@lists.stir.ac.uk%3cmailto:sarnissa->

african-aquaculture-bounces@lists.stir.ac.uk<mailto: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=fn…
 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<http://www.sarnissa.org%3cht…
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-<mailto:sarnissa-african-aquaculture-bounces@lists.stir.ac.uk%3cmailto:sarnissa->

african-aquaculture-bounces@lists.stir.ac.uk<mailto: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-<mailto:sarnissa-african-aquaculture-bounces@lists.stir.ac.uk%3cmailto:sarnissa->

african-aquaculture-bounces@lists.stir.ac.uk<mailto: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-<mailto:sarnissa-african-aquaculture@lists.stir.ac.uk%3cmailto:sarnissa-african->
 aquaculture@lists.stir.ac.uk<mailto: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<mailto:info@fishdesigns.co.za%3cmailto:info@fishdesigns.co.za>>

 Web: 
http://www.fishdesigns.co.za<http://www.fishdesigns.co.za/<http://www…

 From:

sarnissa-african-aquaculture-bounces@lists.stir.ac.uk<mailto:sarnissa-<mailto:sarnissa-african-aquaculture-bounces@lists.stir.ac.uk%3cmailto:sarnissa->

african-aquaculture-bounces@lists.stir.ac.uk<mailto: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-<mailto:sarnissa-african-aquaculture@lists.stir.ac.uk%3cmailto:sarnissa-african->
 aquaculture@lists.stir.ac.uk<mailto: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<mailto:nakagitta@gmail.com%3cmailto:nakagitta@gmail.com>>>
 To:

sarnissa-african-aquaculture@lists.stir.ac.uk<mailto:sarnissa-african-<mailto:sarnissa-african-aquaculture@lists.stir.ac.uk%3cmailto:sarnissa-african->
 aquaculture@lists.stir.ac.uk<mailto: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<mailto:wnasilele9@gmail.com%3cmailto: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<mailto:e.d.devic@stir.ac.uk%3cmailto: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.

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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.

 --
 Jim Miller
 Team Leader
 SOFRECO/World Bank
 Value Chain Development Project
 Hargeisa, Somaliland
 Tel: 00252 2 484 9394
 E-mail: jimfishafrica@gmail.com<mailto:jimfishafrica@gmail.com>
 james.miller@sofreco.biz<mailto:james.miller@sofreco.biz>
 Skype: millerfishafrica
 Skype: millerfishafrica

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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<mailto:Sarnissa-african-aquaculture@lists.stir.ac.uk>
 http://lists.stir.ac.uk/cgi-bin/mailman/listinfo/sarnissa-african-aquacultu… 
-- 
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.