Testing for hybridization between Nile tilapia (Oreochromis niloticus) and blue spotted tilapia (Oreochromis leucostictus) in the Lake Edward system |
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| Affiliation: | 1. Section Vertebrates, Biology Department, Royal Museum for Central Africa, Tervuren, Belgium;2. Laboratory of Biodiversity and Evolutionary Genomics, Department of Biology, University of Leuven, Leuven, Belgium;3. Operational Directorate Taxonomy and Phylogeny, Royal Belgian Institute of Natural Sciences, Brussels, Belgium;1. Department of Geography and Environmental Management, University of Waterloo, Waterloo, ON, Canada;2. Water Institute, University of Waterloo, Waterloo, Ontario, Canada;1. Office of Applied Science, Wisconsin Department of Natural Resources, 2801 Progress Road, Madison, WI 53716, United States;2. Bureau of Fisheries Management, Wisconsin Department of Natural Resources, 1701 North 4th Street, Superior, WI 54880, United States;3. Bureau of Fisheries Management, Wisconsin Department of Natural Resources, 3550 Mormon Coulee Road, La Crosse, WI 54601, United States;1. Environmental Research Center, Department of Chemistry, State University of New York at Oswego, Oswego, NY 13126, United States;2. U.S. Geological Survey, Great Lakes Science Center, Oswego, NY 13126, United States;3. Environment and Climate Change Canada, Burlington, ON L7S 1A1, Canada;4. Clarkson University, Potsdam, NY 13126, United States;5. U.S. Fish and Wildlife Service, Panama City, FL 32405, United States;1. Department of Biological Sciences, Oakland University, 118 Library Drive, Rochester, MI 48309-4479, USA;2. Department of Biology, Trent University, 2140 East Bank Drive, Peterborough, ON, K9J 7B8, Canada;1. Water Science and Technology Directorate, Environment and Climate Change Canada, 867 Lakeshore Road, Burlington, Ontario L7S 1A1, Canada;2. Agriculture and Agri-Food Canada, Fredericton Research and Development Centre, Coastal Region, Fredericton, New Brunswick E3B 4Z7, Canada;1. Vermont Cooperative Fish and Wildlife Research Unit, Rubenstein School of Environment and Natural Resources, 81 Carrigan Drive, 302 Aiken Center, University of Vermont, Burlington, VT 05405, USA;2. U. S. Geological Survey, Vermont Cooperative Fish and Wildlife Research Unit, Rubenstein School of Environment and Natural Resources, 81 Carrigan Drive, 302 Aiken Center, University of Vermont, Burlington, VT 05405, USA;3. School of Marine Sciences, 5741 Libby Hall Room 110, University of Maine, Orono, ME 04469, USA |
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| Abstract: | Oreochromis is the most important tropical freshwater fish genus for aquaculture purposes, with various introduction and translocation events having played an integral part of its management. Some Oreochromis species such as the Nile tilapia, O. niloticus, are thought to be superior for aquacultural purposes when compared to other species. Hence, understanding the admixed nature of the species within a native system is of key importance for the development of future broodstock. Using a combination of mitochondrial (COI) and nuclear (microsatellites) DNA, we tested for the presence of O. niloticus and O. leucostictus hybrids within the Lake Edward-George system. The present study revealed that, despite their natural overlapping ranges, hybridization between O. niloticus and O. leucostictus appears to be rare within the Lake Edward-George system, suggesting that the native populations of these two species may serve as suitable broodstock to develop future aquaculture strains. Moreover, our study provides the first COI sequences for O. leucostictus from its native range and adds to the growing database of O. niloticus sequences. |
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| Keywords: | Freshwater fish Tilapia Hybridization Introgression African Great Lakes |
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