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Re: [Sarnissa] Tilapia and Catfish Trade in Nigeria
by Alexandra Pounds 12 May '18

12 May '18

Ok, increases in supply. It's very interesting to hear that people want a new taste of fish - "taste" is so subjective and dependent on culture. Has anyone else felt (or not) the effects of illegal imports into Nigeria? D'accord, augmentation d'offre. C'est trés intéressant entendre que des personnes veulent un nouveau gout de poisson - "gout" est trés subjectif et dépendant de la culture. Il y a des autres personnes qui ont sentir (ou pas) des effets du commerce illicit au Nigeria? Alexandra On Sat, May 12, 2018 at 9:35 AM, Babatunde Oreyemi <oreyemibabs(a)gmail.com> wrote: > Many thanks. > In the case of seasonality, this occurs during and the offset of the rainy > season. At this time, fishermen are able to catch more fishes in the > country water bodies making the availability high. On the part of the > people, they want a new taste of fish and these set of fish are relatively > cheaper than cultured fish. > > The smuggling issue is still there, but considering my area, the act has > decreased. Many of the cold rooms have closed shops. Due to the constant > power outages, the few available ones are left struggling. > > BABATUNDE OREYEMI, > BEEKEEPER & CATFISH FINGERLING PRODUCER, > 9, BISI MORAFA STREET, GRA, IJEBU ODE, OGUN STATE. > 234-08055203894 > 234-08102135278 > 234-09027436799 -whatsapp > > On May 12, 2018 04:26, "Alexandra Pounds" <alexandrapounds(a)gmail.com> > wrote: > >> It is great to read about your first-hand experience - thanks for >> sharing. Do you find that the seasonality is connected to local customs or >> certain times of year when people want to eat more fish? Or is the >> seasonality of market price due to increased production of fish during >> certain times of year? >> >> High taxes placed on imported fish is resulting in unprofitable cold >> rooms, and potentially an increase in illegal trade? (illegal imports don't >> pay taxes). While taxes are meant to protect local trade, taxes that are >> too high increase the illegal trade, which ends up hurting local trade... >> Is this is case in Nigeria? >> >> >> C'est genial lire de votre experience - merci de partager. Trouvez-vous >> que le saisonnalité est connecté à des coutumes locals, ou temps d'année >> quand des personnes veulent manger plus de poisson? Ou, le saisonnalité de >> le prix de marché est à cause de l'augmentation de production de poisson >> pendant certains temps d'année? >> >> Des taxes qui sont mis en place sur poisson importé résultent des salles >> froides peu profitable, et pourrait résulter un augmentation du commerce >> illicit? (Des importations illicit ne paye pas des taxes). Alors que des >> taxes devraient proteger de commerce local, des taxes que sont trop hautes >> pourrait augmenter du commerce illicit, quel finalement endommager du >> commerce illicit... C'est ça le cas au Nigeria? >> >> Alexandra >> >> On Sat, May 12, 2018 at 2:01 AM, Babatunde Oreyemi <oreyemibabs(a)gmail.com >> > wrote: >> >>> I ll suggest you carry out further research on this article. >>> What is keeping the price of fish down in Nigeria is not about imported >>> fish. The high tarrif placed on imported fish is making many cold rooms the >>> receiver of this imported fish go under. >>> Am a fish farmer here and I can say two things are making the price go >>> down and they are >>> 1. Season of the year >>> 2. As the cost of production becomes high, people won't have the >>> purchasing means to buy. >>> Nigeria aquaculture is yet to saturate the market. >>> >>> BABATUNDE OREYEMI, >>> BEEKEEPER & CATFISH FINGERLING PRODUCER, >>> 9, BISI MORAFA STREET, GRA, IJEBU ODE, OGUN STATE. >>> 234-08055203894 >>> 234-08102135278 >>> 234-09027436799 -whatsapp >>> >>> On May 11, 2018 18:56, "Alexandra Pounds via >>> Sarnissa-african-aquaculture" <sarnissa-african-aquaculture@ >>> lists.stir.ac.uk> wrote: >>> >>>> This article suggests that while there is a potential for new tilapia >>>> and catfish farms in Nigeria, it also suggests that illegal imports are >>>> keeping market prices down. >>>> >>>> Are illegal imports of tilapia and catfish in Nigeria are preventing >>>> Nigerian aquaculture farms from being financially competitive? Should the >>>> government prevent this? If so, how? >>>> >>>> https://independent.ng/tilapia-farming-expert-guarantees-40- >>>> return-on-investment/ >>>> >>>> >>>> Cette article suggére que il y a un potentiel pour d'aquaculture de >>>> tilapia et poisson-chat au Nigeria. Il suggére aussi que l'importation >>>> illicit de tilapia et poisson-chat préviennent l'augmentation du prix du >>>> marché. >>>> >>>> Des poissons importé, préviennent-ils des enterprises d'aquaculture au >>>> Nigeria d'etre competitif financièrement? Le gouvernement, devraient-ils >>>> prevenir ça? Si oui, comme? >>>> >>>> https://independent.ng/tilapia-farming-expert-guarantees-40- >>>> return-on-investment/ >>>> >>> >> >> >> -- >> --- >> Alexandra Pounds >> MSc Sustainable Aquaculture, University of Stirling >> BSc Earth Systems, Stanford University >> (+1) 650.336.4554 >> (+44) 757.283.9224 >> > -- --- Alexandra Pounds MSc Sustainable Aquaculture, University of Stirling BSc Earth Systems, Stanford University (+1) 650.336.4554 (+44) 757.283.9224

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Re: [Sarnissa] Tilapia and Catfish Trade in Nigeria
by Alexandra Pounds 12 May '18

12 May '18

It is great to read about your first-hand experience - thanks for sharing. Do you find that the seasonality is connected to local customs or certain times of year when people want to eat more fish? Or is the seasonality of market price due to increased production of fish during certain times of year? High taxes placed on imported fish is resulting in unprofitable cold rooms, and potentially an increase in illegal trade? (illegal imports don't pay taxes). While taxes are meant to protect local trade, taxes that are too high increase the illegal trade, which ends up hurting local trade... Is this is case in Nigeria? C'est genial lire de votre experience - merci de partager. Trouvez-vous que le saisonnalité est connecté à des coutumes locals, ou temps d'année quand des personnes veulent manger plus de poisson? Ou, le saisonnalité de le prix de marché est à cause de l'augmentation de production de poisson pendant certains temps d'année? Des taxes qui sont mis en place sur poisson importé résultent des salles froides peu profitable, et pourrait résulter un augmentation du commerce illicit? (Des importations illicit ne paye pas des taxes). Alors que des taxes devraient proteger de commerce local, des taxes que sont trop hautes pourrait augmenter du commerce illicit, quel finalement endommager du commerce illicit... C'est ça le cas au Nigeria? Alexandra On Sat, May 12, 2018 at 2:01 AM, Babatunde Oreyemi <oreyemibabs(a)gmail.com> wrote: > I ll suggest you carry out further research on this article. > What is keeping the price of fish down in Nigeria is not about imported > fish. The high tarrif placed on imported fish is making many cold rooms the > receiver of this imported fish go under. > Am a fish farmer here and I can say two things are making the price go > down and they are > 1. Season of the year > 2. As the cost of production becomes high, people won't have the > purchasing means to buy. > Nigeria aquaculture is yet to saturate the market. > > BABATUNDE OREYEMI, > BEEKEEPER & CATFISH FINGERLING PRODUCER, > 9, BISI MORAFA STREET, GRA, IJEBU ODE, OGUN STATE. > 234-08055203894 > 234-08102135278 > 234-09027436799 -whatsapp > > On May 11, 2018 18:56, "Alexandra Pounds via Sarnissa-african-aquaculture" > <sarnissa-african-aquaculture(a)lists.stir.ac.uk> wrote: > >> This article suggests that while there is a potential for new tilapia and >> catfish farms in Nigeria, it also suggests that illegal imports are keeping >> market prices down. >> >> Are illegal imports of tilapia and catfish in Nigeria are preventing >> Nigerian aquaculture farms from being financially competitive? Should the >> government prevent this? If so, how? >> >> https://independent.ng/tilapia-farming-expert-guarantees-40- >> return-on-investment/ >> >> >> Cette article suggére que il y a un potentiel pour d'aquaculture de >> tilapia et poisson-chat au Nigeria. Il suggére aussi que l'importation >> illicit de tilapia et poisson-chat préviennent l'augmentation du prix du >> marché. >> >> Des poissons importé, préviennent-ils des enterprises d'aquaculture au >> Nigeria d'etre competitif financièrement? Le gouvernement, devraient-ils >> prevenir ça? Si oui, comme? >> >> https://independent.ng/tilapia-farming-expert-guarantees-40- >> return-on-investment/ >> > -- --- Alexandra Pounds MSc Sustainable Aquaculture, University of Stirling BSc Earth Systems, Stanford University (+1) 650.336.4554 (+44) 757.283.9224

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Tilapia and Catfish Trade in Nigeria
by Alexandra Pounds 11 May '18

11 May '18

This article suggests that while there is a potential for new tilapia and catfish farms in Nigeria, it also suggests that illegal imports are keeping market prices down. Are illegal imports of tilapia and catfish in Nigeria are preventing Nigerian aquaculture farms from being financially competitive? Should the government prevent this? If so, how? https://independent.ng/tilapia-farming-expert-guarantees-40-return-on-inves… Cette article suggére que il y a un potentiel pour d'aquaculture de tilapia et poisson-chat au Nigeria. Il suggére aussi que l'importation illicit de tilapia et poisson-chat préviennent l'augmentation du prix du marché. Des poissons importé, préviennent-ils des enterprises d'aquaculture au Nigeria d'etre competitif financièrement? Le gouvernement, devraient-ils prevenir ça? Si oui, comme? https://independent.ng/tilapia-farming-expert-guarantees-40-return-on-inves…

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Appel à Manifestation d'intérêt pour le recrutement d'une Assistance Technique à Maitrise d'Ouvrage dans le cadre du projet PISCOFAM GUINEE
by Mohamed Bob DIABY 10 May '18

10 May '18

Cher (e)s toutes et tous, Le Ministère des Pêches, de l'Aquaculture et de l'Economie Maritime de Guinée, à travers la Direction Nationale de la Pisciculture (DNP), lance l'Appel à Manifestation d’intérêt visé en objet dans le cadre du Projet de Développement de la Pisciculture Commerciale Familiale en Guinée (PISCOFAM GUINEE) sur Financement de l'Agence Française de Développement (AFD). La date limite de soumission est fixée le 18 juin 2018 à 11 h 30 mn, heure locale ( GMT + 00). L'appel est également diffusé sur le site de DG Market de l'AFD et dans deux journaux locaux. Ci-joint en version PDF et au plaisir de vous savoir nombreux à postuler et /ou partager. Très cordialement . M. DIABY Mohamed Bob DIABY, Directeur National Adjoint de la Pisciculture Ministère des Pêches,de l'Aquaculture et de l'Economie Maritime BP: 307 Conakry - République de Guinée Tel: +224) 622 13 03 96 / 664 47 34 23 / 655 41 02 40 Email: bobdiaby(a)yahoo.frEmail: sidikikeita(a)yahoo.fr

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Overfishing in / Surpeche en Hawassa Lake, Ethiopia
by Alexandra Pounds 04 May '18

04 May '18

Has anyone near Hawassa Lake been affected by overfishing, as this article suggests? Il y a personne vers Hawassa Lake, qui a été affecté pour surpeche, comme cette article suggére? https://www.aa.com.tr/en/africa/ethiopia-overfishing-threatens-aquaculture/… Best, Alexandra Pounds

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FW: The Newsletter for industry - n° 102 May 2018
by William Leschen 04 May '18

04 May '18

From: INRA <NLdpti(a)inra.fr> Sent: 04 May 2018 09:03 To: William Leschen <william.leschen(a)stir.ac.uk> Subject: The Newsletter for industry - n° 102 May 2018 Si cette lettre d'information ne s'affiche pas correctement, aller à la version en ligne<http://www.aspmail.info/click.php?url=DLG14FKHB5DQM97ESI/4NRK06JT&url2=tA3p…> [http://www.inra.fr/extension/itkinra/design/inra/images/newsletter/nl-top.j…] MailScanner has detected a possible fraud attempt from "www.aspmail.info" claiming to be [logo pour la newsletter] // <http://www.aspmail.info/click.php?url=DLG14FKHB5DQM97ESI/4NRK06JU&url2=tA3p…> <http://www.aspmail.info/click.php?url=DLG14FKHB5DQM97ESI/4NRK06JU&url2=tA3p…>

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Des souches et le biodiversite dans le piscuculture de Ghana
by William Leschen 01 May '18

01 May '18

Traduire de forum anglais Salut Will et d'autres, L'article a quelques erreurs factuelles mais c'est surtout sur le sujet. L'utilisation de «espèces» et de «souches» de façon interchangeable prête à confusion. Le ministre actuel du développement des pêches et de l'aquaculture a été en poste pendant un peu plus d'un an et n'aurait pas pu faire de politique en 2014. Le prêt / don de 53 millions de dollars de la Banque mondiale (?) Souvent cité est expiré ou expire depuis cinq ans. ou alors le projet était axé à 80% sur la pêche et 20% sur l'aquaculture, et pour lequel nous devrions parler maintenant de ses résultats plutôt que de ses objectifs. Sur les questions de fond, l'interdiction de l'importation de tilapia entier et de tilapia vivants congelés est deux politiques différentes - à la fois quelque peu mal informées. L'interdiction du tilapia congelé est censée réduire la concurrence des producteurs asiatiques, mais il existe des preuves que le tilapia est toujours importé dans le cadre de la politique actuelle. Une politique qui crée un environnement propice à l'amélioration de la productivité et de la rentabilité (meilleures tensions et alimentation à bas prix, par exemple) semblerait atteindre davantage pour les agriculteurs et l'économie. La restriction sur le DON et les autres souches améliorées de tilapia ne serait efficace que si (1) il existe une bonne souche comparable disponible pour les agriculteurs au Ghana, et 2) le gouvernement a la capacité de surveiller et de détecter les différentes souches cultivées. Malheureusement, les deux conditions précédentes ne sont pas remplies. Nous avons des données sur la croissance et la génétique qui montrent que la souche Akosombo soutenue par le gouvernement ne croît qu'environ la moitié de la taille du GIFT en un temps égal et que le GIFT a un meilleur TCF. Sans surprise, la souche chinoise GIFT est cultivée sur certaines fermes au Ghana et il y a déjà des traces du CADEAU dans le lac sauvage d'Akosombo. L'augmentation des maladies ainsi que l'introduction des souches «étrangères» sont le résultat de l'absence de mesures de quarantaine parce que le gouvernement ne supervise pas les importations. Il se fait sous couverture ... mais il se répand néanmoins. La nouvelle politique du Ghana, s'il y en a une à l'horizon, devrait être consciente de l'environnement actuel (quelles contraintes existent déjà dans le pays), que ce qui est permis dans les pays voisins affecte la capacité du Ghana à appliquer sa propre politique. La capacité de l'ARDEC d'écloserie gouvernementale à la fois de poursuivre les projets d'amélioration génétique et de surveiller le respect des restrictions d'importation, et il y a une énorme expertise du secteur privé dans le pays et ailleurs sur le continent qui peut être utilisée dans les PPP. Emmanuel Emmanuel A. Frimpong, PhD professeur agrégé Département de la conservation du poisson et de la faune Collège des ressources naturelles et de l'environnement Virginia Polytechnic Institute et l'Université d'État 156 Cheatham Hall Blacksburg, VA 24061-0321 Téléphone (540) 231-6880 | Fax (540) 231-7580 http://www.fishwild.vt.edu/faculty/frimpong.htm 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: Sustainable Aquaculture Stirling<https://www.facebook.com/SustainableAquacultureStirling/> Inst of Aquaculture Stirling Scotland UK<https://www.facebook.com/pages/Institute-of-Aquaculture-Stirling-Scotland-U…> SARNISSA African Aquaculture Network <https://www.facebook.com/sarnissaafrica?ref=hl> Aquaculture Enterprise Malawi<https://www.facebook.com/pages/Aquaculture-Enterprise-Malawi/57280560286237…> SEAT Sustaining Ethical Aquaculture Trade Asia (SEAT) <https://www.facebook.com/SEATGlobal?ref=hl> [cid:image001.png@01D277E0.BC615240]<http://www.aqua.stir.ac.uk/> [cid:image002.png@01D277E0.BC615240]

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No strains no gains .... ? Latest from Ghana as its aquaculture develops .... Les souche de tilapia et le biodiversity
by William Leschen 01 May '18

01 May '18

No strains no gains ? Are Ghana's bio-restrictions harming its aquaculture ? [cid:image002.jpg@01D3E12F.40888E40] Ed Interesting article - for the first time to my knowledge on this subject written by a Ghanaian - This issue not just affecting Ghanaian aquaculture but elsewhere across the continent - with Malawi being perhaps the best example ...... Would welcome our members views on this - many years ago GIFT strain of niloticus was brought in to Ghana and then asked to be removed by the then Ghanaian Fisheries ministry . Its worth noting the words of the Ghanaian pond fish farmer who cannot get any good quality fingerlings for his farm - and also ask Ghanaian fish farmers themselves what have been their experiences with the "Akosombo" strain the govt and Fisheries depts developed through an overseas donor funded project ..... What has been their performance ? Their growth ? Their survival rates ? Their resistance to disease ? Their reaction to handling stress changing environmental conditions - their marketability ? acceptance by consumers ? their taste ? their appearance ? How does this compare with the strains they used before the akosombo strain ? https://thefishsite.com/articles/no-strains-no-gains-are-ghanas-bio-restric… Ed Intéressant article - pour la première fois à ma connaissance sur ce sujet écrit par un Ghanéen - Cette question ne concerne pas seulement l'aquaculture ghanéenne mais ailleurs sur le continent - le Malawi étant peut-être le meilleur exemple ...... Accueillirait les opinions de nos membres à ce sujet. Il y a des années, la souche GIFT de Niloticus a été introduite au Ghana et a ensuite été demandée par le ministère des Pêches de l'époque. Il vaut la peine de noter les paroles du pisciculteur du bassin ghanéen qui ne peut obtenir des alevins de bonne qualité pour sa ferme - et aussi demander aux pisciculteurs ghanéens quelles ont été leurs expériences avec la souche "Akosombo" développée par un donateur étranger. projet financé ... .. Quelle a été leur performance? Leur croissance? Leurs taux de survie? Leur résistance à la maladie? Leur réaction à la gestion du stress modifie les conditions environnementales - leur commercialisation? acceptation par les consommateurs? leur goût? leur apparence ? Comment cela se compare-t-il aux souches qu'ils utilisaient avant la souche akosombo? 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: Sustainable Aquaculture Stirling<https://www.facebook.com/SustainableAquacultureStirling/> Inst of Aquaculture Stirling Scotland UK<https://www.facebook.com/pages/Institute-of-Aquaculture-Stirling-Scotland-U…> SARNISSA African Aquaculture Network <https://www.facebook.com/sarnissaafrica?ref=hl> Aquaculture Enterprise Malawi<https://www.facebook.com/pages/Aquaculture-Enterprise-Malawi/57280560286237…> SEAT Sustaining Ethical Aquaculture Trade Asia (SEAT) <https://www.facebook.com/SEATGlobal?ref=hl> [cid:image001.png@01D277E0.BC615240]<http://www.aqua.stir.ac.uk/> [cid:image002.png@01D277E0.BC615240]

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Calling all Tilapia Hatchery Experts / Demande pour Les Experts d'éclosion de tilapia
by Alexandra Pounds 01 May '18

01 May '18

*[English] What have you found to be the key to successful hatching of tilapia eggs? Is there a magic bullet? What is your estimated survival rates for: Hatching? Swim up? First Feeding? Sex Reversal? * *Ideas presented (by Karen Veverica & Nick James): * - managers should keep the eggs moving; - eggs should not be left out in bowls for too long; - bowls should be kept clean; - eggs should be carefully ejected from the female's mouth; - temperature should stay stable; - *Oreochromis ssp.* should be kept separate to avoid hybridisation, which can result in poor fertilisation and viability. *[Français] Avez-vous rencontré la clé de l'éclosion réussi des oeufs de tilapia? Il y a un balle magique? Qu'est-ce que sont votre taux de survie pour: L'éclosion? Nager? Premiere repas? Retournement de sexe? * *Idées presenté (pour Karen Veverica et Nick James):* - les chefs doivent continuer le movement des oeufs tous les temps; - il faut que des oeufs ne sont pas délaissé pour beaucoup des temps; - il faut que des bols sont propres; - il faut que des oeufs sont s'éjectés avec prudence de la bouche de la femalle; - il faut que le temperature est stable; - il faut que *Oreochromis ssp. *sont séparé pour éviter hybridisation, dont qui pourrait provoquer mauvais fertilisation et viabilité. --- Alexandra Pounds Assistant Manager Production Hatchery - OSO Farming LGA MSc Sustainable Aquaculture, University of Stirling BSc Earth Systems, Stanford University (+44) 757.283.9224

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Re: [Sarnissa] Calling all Tilapia Hatchery Experts / Demande pour Les Experts d'éclosion de tilapia
by Alexandra Pounds 30 Apr '18

30 Apr '18

*[English] *Thank you for your expertise Nick! This is very helpful information. Does anyone else have experiences with these different systems? Has anyone transitioned from smaller tanks to larger tanks? What have you found to be best practices? *[Français] *Merci pour votre expertise Nick! C'est des renseignements trés utils. Il y a personne qui a des experiences avec ces systemes differents? Il ya personne qui a changé des bacs petits a des bacs grands? Qu'est-ce sont des pratiques meilleur? On Mon, Apr 30, 2018 at 12:03 PM, Nick James <nickjames(a)intekom.co.za> wrote: > Hi Alexandra > > > > To answer your questions: > > > > · No, the management of larger ponds is easier than that of small > water bodies such as tanks, that depend on filtration and energy. Water > volume implies a certain resilience against water quality change…be that > temperature or chemical changes…that would adversely affect breeding > performance. I know we would all like to see our fish in carefully > controlled, scientifically designed, sterile re-circulating systems…but did > we ever ask the fish what they prefer? Green water ponds produce the best > fish, be that for eating …or for breeding purposes…the jury is not out on > that. > > > > · The catching of mouth-brooding female tilapia in round tanks > can be an issue. Screens that divide the tanks have to be used, and this is > often a harsh and stressful experience for the fish. In hapas, a pole under > the net is slowly moved to one end to crowd the fish into one corner (as in > the photo). Females are then netted out and the eggs gently flushed out > using a pipette bottle (not the fish shaken violently head-down into a > bucket!). Use of the pipette-bottle flushes out 100% of the eggs that the > older method often does not, resulting in a few eggs still in the mouth > and reduced spawning thereafter by that female fish. Once stripped of eggs, > the female is then dropped into the other side of the hapa, so is only out > the water for about 30 seconds. The hapa netting holds any eggs that may be > spat out, and can be collected at the end of the process. Since all the > water is common, no temperature changes result. Eggs collecting bowls can > be floated in the tank, before removal to the hatchery. In Thailand, I have > seen a mobile hatchery on a trailer, where the collected bowls are in > shade, and the eggs temporarily housed in a small 12v recycling system > that keeps them well-oxygenated, cool and moving. > > > > · Sure, larger tanks implies you need more space, something that > many hatcheries may not have. But new systems that don’t use the concrete > and plastic systems much beloved by RAS have evolved in the Far East and > are now used in Africa. Rectangular ponds comprising the entire footprint > of a greenhouse tunnel (50x10m or 30x 10m), lined with a liner, work well > as breeding ponds where warmer water than ambient is required. This can be > connected to filtration if required, but the loading on a breeding system > is far less than on a grow out system. Tilapia seem to breed better if kept > slightly hungry…something to do with evolution: environmental stresses > causing a turn to reproduction rather than growth. A lined earth pond is > certainly not more expensive than an equal sized tank system. > > > > Regards > > > > Nick > > > > *From:* Alexandra Pounds [mailto:alexandrapounds@gmail.com] > *Sent:* 30 April 2018 10:22 AM > *To:* Nick James <nickjames(a)intekom.co.za> > *Cc:* sarnissa-french-aquaculture(a)lists.stir.ac.uk > *Subject:* Re: Calling all Tilapia Hatchery Experts / Demande pour Les > Experts d'éclosion de tilapia > > > > Excellent photo Nick - thanks for sharing. It makes sense that conditions > closer to those in the wild would improve success rates. > > > > Some questions: > > - Is the management of larger ponds is more difficult? > > - Are there different management techniques for catching brooders in > larger tanks? > > - Does anyone encounter space, water, energy, or financial limitations for > larger tanks? > > > > Merci å Nick pour le photo excellent. C'est logique que des conditions qui > resemble celle-lui de la sauvage voudraient ameliorer des taux de succes. > > > > Quelques questions: > > - La gestion, est-il plus difficil pour des bacs qui sont plus grandes? > > - Il y a des techniques differents de la gestion pour attraper des > geniteurs dans les bacs plus grandes? > > - Il y a personnes qui rencontré des limitations de space, d'eau, > d'énergie, ou de finance pour des bacs plus grandes? > > > > Alexandra > > > > On Mon, Apr 30, 2018 at 10:57 AM, Nick James <nickjames(a)intekom.co.za> > wrote: > > One of the aspects that seriously affect hatching of tilapia eggs which > has not been mentioned, is the breeding set-up used. The old-fashioned > rectangular concrete or (even worse) round plastic breeding tank system > whereby tilapia breeders are confined to a small space goes against Nature. > In the wild, tilapia nests are often 1-2m in diameter and spaced 1-5m > apart, between breeding males. Once spawning is complete, mouth-brooding > females leave the arena. In captivity, we try to circumvent this by > cramming many males and even more females in a small space…often tanks as > small as 2000-5000l. This results in much inter-male competition and > aggression, interruption of the spawning process by other fish, as well as > little room for mouth-brooding females to escape over-attentive or even > competitive males. > > > > Modern hapa-breeding methods using long hapas (10-40m in length by 3-5m > width) in tunnels or in ponds in warmer areas, get over this problem. > Males have space to be territorial without interfering with each other and > mouth-brooding females can find refuge. This all results in much better > ‘harvests’ of more viable eggs, and is used by most commercial hatcheries > these days. > > > > The main issue seems to be convincing conservative government officials > who seem to be unaware of these newer and more successful methods for use > in their fish stations… > > > > I attach an example (with thanks to Vedad Alavian for the use of a photo > of his fish farm in Kasama, NE Zambia). > > > > Regards > > > > Nick > > > > > > Nicholas P E James MSc (Ichthyology) (Rhodes), BA (Hons, Geography) > (Rhod.), Grad. C. E., Pr. Sci. Nat. > > Rivendell Hatchery > > PO Box 6146 Market Square > > Grahamstown > > E. Cape > > 6141 > > Cell +27-(0)82 575 9781 > > email nickjames(a)intekom.co.za > > website www.rivendellhatchery.co.za > > > > > > > > > > > > *From:* Sarnissa-african-aquaculture [mailto:sarnissa-african- > aquaculture-bounces(a)lists.stir.ac.uk] *On Behalf Of *Alexandra Pounds via > Sarnissa-african-aquaculture > *Sent:* 29 April 2018 05:43 PM > *To:* sarnissa-french-aquaculture(a)lists.stir.ac.uk; > sarnissa-african-aquaculture(a)lists.stir.ac.uk > *Subject:* Calling all Tilapia Hatchery Experts / Demande pour Les > Experts d'éclosion de tilapia > > > > *[English] What have you found to be the key to successful hatching of > tilapia eggs? Is there a magic bullet? What is your estimated survival > rates for: Hatching? Swim up? First Feeding? Sex Reversal? * > > > > *Ideas presented (by Karen Veverica & Nick James): * > > - managers should keep the eggs moving; > > - eggs should not be left out in bowls for too long; > > - bowls should be kept clean; > > - eggs should be carefully ejected from the female's mouth; > > - temperature should stay stable; > > - *Oreochromis ssp.* should be kept separate to avoid hybridisation, > which can result in poor fertilisation and viability. > > > > > > *[Français] Avez-vous rencontré la clé de l'éclosion réussi des oeufs de > tilapia? Il y a un balle magique? Qu'est-ce que sont votre taux de survie > pour: L'éclosion? Nager? Premiere repas? Retournement de sexe? * > > > > *Idées presenté (pour Karen Veverica et Nick James):* > > - les chefs doivent continuer le movement des oeufs tous les temps; > > - il faut que des oeufs ne sont pas délaissé pour beaucoup des temps; > > - il faut que des bols sont propres; > > - il faut que des oeufs sont s'éjectés avec prudence de la bouche de la > femalle; > > - il faut que le temperature est stable; > > - il faut que *Oreochromis ssp. *sont séparé pour éviter hybridisation, > dont qui pourrait provoquer mauvais fertilisation et viabilité. > > > > > > --- > Alexandra Pounds > > Assistant Manager Production Hatchery - OSO Farming LGA > MSc Sustainable Aquaculture, University of Stirling > BSc Earth Systems, Stanford University > (+44) 757.283.9224 > > > > > > > > -- > > --- > Alexandra Pounds > MSc Sustainable Aquaculture, University of Stirling > BSc Earth Systems, Stanford University > (+1) 650.336.4554 > (+44) 757.283.9224 > -- --- Alexandra Pounds MSc Sustainable Aquaculture, University of Stirling BSc Earth Systems, Stanford University (+1) 650.336.4554 (+44) 757.283.9224

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