Abstract
A structured breeding program is an important step towards sustainable tilapia aquaculture in Tanzania. The aim of the thesis was to generate baseline information for the establishment of tilapia breeding program in Tanzania. In the first study of this thesis we determined the genetic diversity between and within local and exotic Nile tilapia (Oreochromis niloticus) and Rufiji strains (Oreochromis urolepis urolepis) in Tanzania. Strains of FETA, Victoria, Igunga and TAFIRI had low genetic variation ranging from 0.057 to 0.1 while Kunduchi, Karanga and Ruhila showed highest genetic diversity from 0.214 to 0.212. Strong genetic differentiation was revealed between Karanga and the closely related strains of FETA, Lake Victoria, and Igunga with values from 0.533 to 0.548. STRUCTURE analysis revealed highly admixture among Karanga, Kunduchi, and Ruhila strains while FETA, Victoria, Igunga and TAFIRI showed no admixture. Higher genetic variation was also revealed among Rufiji strains compared to exotic and local Nile tilapia strains. High FST values (0.6- 0.8) were observed between Rufiji strains and the local or exotic Nile tilapia strains. The second part of this thesis based on a common garden experiment where the different strains of tilapia were compared in two environments with differing salinity. Differences in growth performance for all body traits were significant among Nile tilapia strains (P
| Original language | English |
|---|---|
| Qualification | Doctor of Philosophy |
| Publisher | |
| Print ISBNs | 978-91-7760-642-0 |
| Electronic ISBNs | 978-91-7760-643-7 |
| Publication status | Published - 2020 |
Keywords
- Aquaculture
- Nile tilapia
- brackish environment
- common garden
- ddRADseq
- freshwater environment
- genetic diversity
- genetic parameters
SLU series
- Acta Universitatis Agriculturae Sueciae
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