Study of sex ratio in progeny of a complex Oreochromis hybrid,the Florida red tilapia |
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| Affiliation: | 1. ARDA, Freshwater Aquaculture Centre, BP 16, ZI Les Sables, 97427 Etang Salé, Reunion Island, France;2. CIRAD EMVT, Aquaculture Research Unit, BP 5095, 34033 Montpellier cedex 1, France;3. University of Liege, CEFRA, 10 chemin de la Justice, 4500 Tihange, Belgium;4. INRA, Laboratory of Fish Physiology, Avenue du Général Leclerc, 35042 Rennes cedex, France;1. Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou 510301, PR China;2. University of Chinese Academy of Sciences, Beijing, PR China;1. Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China;2. Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Wuhan, 430070, China;3. Key Lab of Freshwater Animal Breeding, Ministry of Agriculture, Wuhan, 430070, China;1. Shandong Provincial Key Laboratory of Animal Cells and Developmental Biology, School of Life Sciences, Shandong University, 72 Jimo Binhai Road, Qingdao, Shandong, 266237, China;2. Shandong Provincial Key Laboratory of Animal Resistance Biology, College of Life Sciences, Shandong Normal University, No. 88 East Wenhua Road, Jinan, 250014, China;1. Department of Marine Bioscience and Technology, Gangneung-Wonju National University, Gangneung 210-702, South Korea;2. Namhae Fisheries Hatchery Station, Korea Fisheries Resources Agency, Wando 537-806, South Korea;3. Department of Aquatic Life Medicine, Pukyong National University, Busan 608-737, South Korea;1. Department of Physical Geography, and Bolin Centre for Climate Research, Stockholm University, Sweden;2. Water Systems Analysis Group, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, USA;1. College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China;2. College of Fisheries, Ocean University of China, Qingdao 266003, China;3. Institute of Evolution & Marine Biodiversity, Ocean University of China, Qingdao 266003, China;4. First Institute of Oceanography, State Oceanic Administration of China, Qingdao 266061, China |
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| Abstract: | This paper reports a study on the progeny sex-ratio distribution in the Florida red tilapia. This hybrid originated as a cross between O. mossambicus male and O. urolepis hornorum female, which was then crossed with O. niloticus and O. aureus in order to improve its growth rate and its resistance to low temperature. We have studied the sex-ratio of 111 progenies from 46 females and 12 males, where the male percentage varied between 5% to 89%. The analysis of distribution showed three groups characterised by a mean male percentage of 26.7 ± 9.8; 50.0 ± 8.9 and 70.3 ± 5.5%. The stability of sex ratios in repeated single pair matings and the parental influence on progeny sex ratios obtained are in agreement with a polygenic basis of sex determination in this complex hybrid. |
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