Reproductive Performance and Early Growth of Three Strains of Nile Tilapia (Oreochromis niloticus) in Egypt: Abbassa, Kafr El Sheikh, and Manzala | ||
| Journal of Animal, Poultry & Fish Production | ||
| Article 4, Volume 5, Issue 1, December 2016, Pages 25-32 PDF (249.58 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/japfp.2016.7422 | ||
| Author | ||
| Mohamed Said* | ||
| Aquaculture Department, Faculty of Fish Resources, Suez University, Suez, Egypt | ||
| Abstract | ||
| The study compared some reproductive parameters and early growth performance in three Nile tilapia strains one of which have been improved concerning harvest weight and survival rate (Abbassa) and two non-improved local strains (Kafr El Sheikh and Manzala).A total of 100 females and 30 males from each strain were stocked into five separate hapas (3 X 8 X 1m). After 4 weeks conditioning phase five spawning cycles were conducted. Every spawning cycle 36 females and 12 males from each strain were selected and stocked into six spawning hapas (1 X 2 X 1m), each group contained two males and six females in order to determine some reproductive parameters. From the production of first spawning cycle 1000 fry were randomly selected from each strain and transferred to 12 hapas (3×4×1 m), four replicates of each strain at a stocking rate of 250 fry/hapa for a further growth period of 60 days. The local commercial strain Kafr El Sheikh showed superior ovary weight (g), gonado-somatic index (GSI), absolute fecundity, and relative fecundity (31, 41, 40, and 41% respectively) over the Abbassa strain. Manzala strain was also greater than Abbassa strain in gonado-somatic index (GSI), absolute fecundity, and relative fecundity (20, 22, and 25 % respectively). Fry number/female and fry number/g. female in Abbassa strain were lower than Kafr El Sheikh strain with 24.1 and 26.4% respectively and were also lower than Manzala strain with16.3 and 16.01% respectively. All studied reproductive parameters were significantly higher at June followed with May within 5 months experimental period. As for early growth performance final body weight and survival rate % of Abbassa strain were significantly (P<0.01) higher than those of Kafr El Sheikh and Manzala strains. Average daily gain (ADG) and condition factor were also significantly (P<0.001) higher in Abbassa strain than Kafr El Sheikh and Manzala commercial strains. In conclusion, Abbassa strain showed the lowest results in all reproductive parameters and the best in the early growth performance. | ||
| Keywords | ||
| Reproductive parameters; fecundity; fry production; Early growth; selection | ||
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