My tips are: 1. Incorporate a slow sand filter in your egg incubation system 2. Keep the water at 4-7 ppt to prevent trichodina 3. Don’t allow pH and alkalinity to get high. Use acid to control it. 4. Use mobile hatcheries in the field if you hatchery is located more than 100 m from your spawning ponds. 5. Have a trained technician in the hatchery at night and make sure he isn’t an alcoholic. Best regards Warren From: Sarnissa-african-aquaculture <sarnissa-african-aquaculture-bounces(a)lists.stir.ac.uk> On Behalf Of Alexandra Pounds via Sarnissa-african-aquaculture Sent: 29 April 2018 22:43 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