Padmaja Jayaprasad PradeepThekkeparambil Chandrabose SrijayaAnuar HassanAnil Kumar ChatterjiBoonsirm WithyachumnarnkulAndrew JeffsUniversiti Malaysia TerengganuMahidol UniversityUniversity of MalayaUniversity of Auckland2018-11-092018-11-092014-01-01Aquaculture International. Vol.22, No.3 (2014), 1163-11741573143X096761202-s2.0-84900031225https://repository.li.mahidol.ac.th/handle/20.500.14594/33115Production of sterile triploid red tilapia [Oreochromis mossambicus (Mozambique tilapia); Peters, 1852 × Oreochromis niloticus (Nile tilapia); Linnaeus, 1758] is an effective strategy to overcome their prolific breeding. Optimal conditions for cold-shock induction of triploidy in red tilapia were investigated by experimentally examining two variables: appropriate temperature of the shock and duration of shock treatment. A constant time after insemination of 4 min was used to determine the best combination of temperature (6, 7, 8, 9, 11, 13, 15 °C) with different durations of shock (10, 20, 30, 40, 50 min) with resultant ploidy level verified karyotypically. Shock duration for 30 min at a temperature of 9 °C was found most effective in producing maximum triploidy (98.7 %) with higher rates of hatching (63.2 %) and survival up to yolk-sac stage (75.8 %). The chromosome count confirmed that triploid percentages were higher when cold shock was used for longer durations at each temperature; however, hatching rates were generally decreased. The maximum triploid yield (82.1 %) obtained was higher than the yield obtained using heat shock (72.7 %) in red tilapia previously. The application of the results of this study has the potential to greatly improve the production of triploid red tilapia in commercial aquaculture. © 2013 Springer Science+Business Media Dordrecht.Mahidol UniversityAgricultural and Biological SciencesArticleSCOPUS10.1007/s10499-013-9736-4