Effect of Brood Stock Size Combination on Reproductive Performance of Nile Tilapia (Oreochromis niloticus) | ||||
| Journal of Animal, Poultry & Fish Production | ||||
| Article 1, Volume 4, Issue 1, December 2015, Page 1-5 PDF (681.33 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/japfp.2015.7423 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Said M.1; A. Elsherbeny* 2 | ||||
| 1Aquaculture Department, Faculty of Fish Resources, Suez University, Suez, Egypt | ||||
| 2Fish Population Dynamics Dept., Fisheries Division, National Institute of Oceanography and Fisheries, Suez, Egypt | ||||
| Abstract | ||||
| Two hundred and four Oreochromis niloticus brood stock were used in the experiment. Males and females were classified into three groups according to their body weights as follows; large (400 – 650 g), medium (160 – 300 g) and small (80-120 g) which coded A, B and C; respectively. All possible nine combinations between the three weight categories were conducted. Testes and ovary weights were significantly affected (P < 0.001 & P < 0.01 respectively) with different broodstock size groups. The highest testes and ovary weights were recorded at large-sized group, while it decreased steadily from medium to small-sized groups; respectively. Absolute fecundity, relative fecundity, and egg weight were all significantly affected (P < 0.01) with female size. The highest absolute fecundity and egg weight were obtained in large-sized females while the highest relative fecundity was obtained in the small-sized females. Gonado-somatic index didn’t affect significantly with the various sizes of the female. Total collected fry number and growth performance represented as fry weight, length, and condition factor at the age of 6 weeks were all significantly (P < 0.001) affected with broodstock size combinations. The highest fry numbers were obtained from the AB, AC, and BC combinations respectively, whilst the lowest were recorded by BA and CB combinations. The highest fry weight and length at the age of 6 weeks after hatching were obtained from combinations AA, BB, and CA respectively. Nonetheless, the AC combination showed the lowest body weight and length. The highest condition factor was recorded by AB combination while the lowest was for the AC's. | ||||
| Keywords | ||||
| Nile tilapia; Broodstock; Size combination; Reproduction; fecundity; egg weight; Fry performance | ||||
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