8 Nov
2016
8 Nov
'16
3:59 p.m.
In English below
Bonjour à tous,
Nous avons eu le même problème des faibles taux de survie des juvéniles de poisson-chat
africain Djo provient principalement de cannibalisme, mais a réussi à surmonter ce
problème par quatre procédures:
1. Le classement des alevins chaque 8-10 jours (pas moins et pas plus).
2. Dépôt direct alimentaires (rotifères) pour la nouvelle alevins hachurée.
3. Construire petite brique plus approprié pour le poisson-chat de fingerlings de
réservoirs d'élevage les hapas de charbon net.
(Et la quatrième procédure était de réduire l'agressivité des géniteurs, si vous
n'appréhendé à partir de ce problème, vous pouvez l'éliminer)
Les mâles et les femelles 4. Injecter avec ovaprim ® réduit l'agressivité et nombre
accru mà d'œufs.
Meilleures salutations,
Nabil
<>> <>> <> <>
<<> <<> <
Dr. Nabil A. Ibrahim,
Scientifique, Aquaculture durable (Genetics)
T: + 2055-3404227, Abbassa, Abou Hammad, Sharkia, Egypte GMT + 2
- 3405579 (Ext 222.)
M: + 2010-20043128, PO Box 1261 Maadi, Le Caire, Egypte-11728-
Skype: nabibr1
F: + 20 55 3405578 www.worldfishcenter.org
From: Ibrahim, Nabil Ahmed (WorldFish) [mailto:N.Ibrahim@cgiar.org]
Sent: 08 November 2016 13:34
To: William Leschen <william.leschen(a)stir.ac.uk>uk>; sarnissa-french-aquaculture
Mailing List <sarnissa-french-aquaculture(a)lists.stir.ac.uk>
Subject: RE: Problems with survival rates of Clarias juveniles in the hatchery ....
Dear All,
We had the same problem of low survival rates of juveniles of African catfish which mainly
came from cannibalism, but we managed to overcome this problem through the following four
procedures:
1. Grading the fry each 8 – 10 days (not less and not more).
2. Introduced live food (rotifers) for the new hatched fry.
3. Built small brick tanks which is more suitable for rearing the catfish
fingerlings than net hapas.
(And the fourth procedure was to reduce the aggressiveness of the broodstock, if you don’t
suffering from this problem you can eliminate it)
4. Inject both males and females with ovaprim ® which reduced the aggressiveness and
increased egg numbers.
Hope to find it useful.
Best regards,
Nabil
<> ><> ><> <><
<>< <><
Dr. Nabil A. Ibrahim,
Scientist, Sustainable Aquaculture (Genetics)
T: + 2055-3404227, Abbassa, Abou Hammad, Sharkia, Egypt GMT+2
- 3405579 (Ext. 222)
M:+2010-20043128, PO Box 1261 Maadi, Cairo-11728- Egypt
Skype: nabibr1
F: + 20 55 3405578
www.worldfishcenter.org<http://www.worldfishcenter.org/>
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From: Sarnissa-african-aquaculture
[mailto:sarnissa-african-aquaculture-bounces@lists.stir.ac.uk] On Behalf Of William
Leschen via Sarnissa-african-aquaculture
Sent: Tuesday, November 08, 2016 11:37 AM
To: sarnissa-african-aquaculture Mailing List; sarnissa-french-aquaculture Mailing List
Subject: FW: Problems with survival rates of Clarias juveniles in the hatchery ....
Traduire en francais au dessus
From: Leslie [mailto:leslie@aquaafrica.co.za]
Sent: 08 November 2016 03:42
To: William Leschen
<william.leschen@stir.ac.uk<mailto:william.leschen@stir.ac.uk>>;
sarnissa-french-aquaculture Mailing List
<sarnissa-french-aquaculture@lists.stir.ac.uk<mailto:sarnissa-french-aquaculture@lists.stir.ac.uk>>
Subject: RE: Problems with survival rates of Clarias juveniles in the hatchery ....
Good morning Koba
With clients and on our own R&D facility we have put enormous effort into perfecting
the survival and growth rate of African catfish over the past years. I can tell you that
there are several factors that are key to obtaining this, including optimising both water
quality & feed, but even so a 50% survival is not realistic. If you get a 20%
survival from egg to 1kg you are doing well.
Regards,
Leslie
Bonjour Koba
Avec nos clients et notre propre centre de R & D, nous avons déployé des efforts
considérables pour améliorer le taux de survie et de croissance du poisson-chat africain
au cours des dernières années. Je peux vous dire qu'il ya plusieurs facteurs qui sont
essentiels à l'obtention de ce, y compris l'optimisation de la qualité de
l'eau et de l'alimentation, mais même si une survie de 50% n'est pas réaliste.
Si vous obtenez une survie de 20% de l'œuf à 1kg vous faites bien.
Cordialement,
Leslie
[AI email signature]<http://www.aquaafrica.co.za/>
From: Sarnissa-african-aquaculture
[mailto:sarnissa-african-aquaculture-bounces@lists.stir.ac.uk] On Behalf Of William
Leschen via Sarnissa-african-aquaculture
Sent: 07 November 2016 05:10 PM
To: sarnissa-african-aquaculture Mailing List; sarnissa-french-aquaculture Mailing List
Subject: Problems with survival rates of Clarias juveniles in the hatchery ....
English translation below
From: AHOCOU Alexandre K [mailto:alexahocou@gmail.com]
Sent: 07 November 2016 12:48
To: William Leschen
<william.leschen@stir.ac.uk<mailto:william.leschen@stir.ac.uk>>
Subject: Re: FW: [catfishfarmersnig] 10, 000 Catfish fingerlings available for sale in
Mowe ( close to market) The power of networks.......
Bonjour à tous
Juste savoir si quelqu'un peut me donner des infos sur comment faire pour avoir un
taux de survie d'au moins 50% des alevins de clarias gariepinus.
En effet, le taux d'éclosion est bon mais déja à partir du 3ème jour de nourrissage à
l'artémia décapsulé on observe une forte mortalité et pour les jours suivants. Et
pourtant on fait un bon siphonnage, l'eau (eau de forage à ph =5.3) sur les larves est
renouvelée au moins 2 fois dans la journée après s'être oxigénée.
J'ai à un moment donné pensé que la cause de la mortalité des alevins pouvait être
soit des virus, bactéries, levures ou champignons. Alors j'ai fait installer un
stérilisateur UV de 30 watt à travers lequel l'eau transite avant d'atteindre les
larves mais pas d'amélioration.
Si quelqu'un a donc une expérience en la matière je serai très sensible à sa bonne
volonté de partage.
Merci
AHOCOU Koba
alexahocou@gmail.com<mailto:alexahocou@gmail.com>
Tél : 90 22 15 83
2016-11-07 10:23 GMT+00:00 William Leschen via Sarnissa-african-aquaculture
<sarnissa-african-aquaculture@lists.stir.ac.uk<mailto:sarnissa-african-aquaculture@lists.stir.ac.uk>>:
Hello everyone
Just to know if anyone can give me information on how to get a survival rate of at least
50% catfish fingerlings gariepinus.
Indeed, the hatching rate is good but already from the 3rd day of feeding decapsulated
Artemia there are high mortalities and for the following days. And yet we also siphoned
off water and replaced it (well water at pH = 5.3) for the larvae repeating this at
least 2 times a day after the water had been well oxygenated.
At first I thought that the cause of the mortality of the fry could be either virus,
bacteria, yeast or fungi. So I installed a 30 watt UV sterilizer through which the water
passes before reaching the larvae but no improvement.
So if anyone has experience in this area I will be very willing to hear from you .
Thank you
Koba AHOCOU
alexahocou@gmail.com<mailto:alexahocou@gmail.com> Tel: 90 22 15 83
Email and mobile phone whats app networks developing commercial aquaculture in
Nigeria
Dear all
Please see below note how this simple yahoo email catfish farmers forum in Nigeria
now with hundreds of members all over the country are buying and selling not just
fingerlings and market fish but also inputs feed fertilisers etc also for
questions and advice There is also a similar equally popular Nigerian catfish farmers
mobile phone whats app group which has daily messages on the same subjects and thus
huge networks of fish farmers communicating with each other on daily basis- In the last
weeks on the catfish farmers app they have been discussing market process for
their grow out fish and how they can potentially state and then country wide try to
control prices - as their margins are ever declining due to the continually increasing
prices per tonne of commercial feed in the country………………….
Please note this for sarnissa fish farmers in other countries - also for those
involved in aquaculture development across SS Africa both govts and also national
and international donors and investors - These email and mobile phone whats app
networks cost next to nothing to set up and normally just the time of a dedicated
individual to run them - And the impacts and concrete positive outcomes from them are
huge ….
Best wishes Will
Sustainable Aquaculture Research Group
Institute of Aquaculture, University of Stirling UK
www.aqua.stir.ac.uk<http://www.aqua.stir.ac.uk/>
Read about the Sustainable Aquaculture Research Group’s new projects and activities at
http://www.susaquastirling.net/
Follow Daily updated Facebook sites (news, publications, videos, employment, funding,
investment and other) for:
Inst of Aquaculture Stirling Scotland
UK<https://www.facebook.com/pages/Institute-of-Aquaculture-Stirling-Scot…
SARNISSA African Aquaculture Network
<https://www.facebook.com/sarnissaafrica?ref=hl>
Aquaculture Enterprise
Malawi<https://www.facebook.com/pages/Aquaculture-Enterprise-Malawi/5728…
SEAT Sustaining Ethical Aquaculture Trade Asia (SEAT)
<https://www.facebook.com/SEATGlobal?ref=hl>
[cid:image002.jpg@01D239D3.409142B0]<http://www.aqua.stir.ac.uk/>
[cid:image003.jpg@01D239D3.409142B0]
From:
catfishfarmersnig@yahoogroups.co.uk<mailto:catfishfarmersnig@yahoogroups.co.uk>
[mailto:catfishfarmersnig@yahoogroups.co.uk<mailto:catfishfarmersnig@yahoogroups.co.uk>]
Sent: 07 November 2016 09:03
To: catfishfarmersnig
<catfishfarmersnig@yahoogroups.co.uk<mailto:catfishfarmersnig@yahoogroups.co.uk>>
Subject: [catfishfarmersnig] 10,000 Catfish fingerlings available for sale in Mowe ( close
to market)
Dear Farmers,
Good morning.
We are offering 10,000 Catfish ( Clarias Garipenus) fingerlngs for sale at our farm site
in mowe.
Serious buyers should please call Okey on 09034871998 for pricing information and pickup
arrangements.
Regards and God Bless,
OkeE
sent from myMTN Sm@rtphone
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