REPORODUCTIVE PERFORMANCE OF OREOCHROMIS NILOTICUSTHROUGH THREE SEASONS IN EARTHEN PONDS | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 13, Volume 7, Issue 4, September 2003, Page 263-282 PDF (1.07 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejabf.2003.1794 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Mohamed Farag | ||||
| Genetics Department, Central Laboratory for Aquaculture Research, Abbassa, Agricultural Research Center, Egypt. | ||||
| Abstract | ||||
| Reproductive performance of Oreochromis niloticus broodstock was examined in earthen ponds through three spawning seasons in Sedy Salm City, Kafer Al-Sheikh Governorate. 21 thousand females (65-150 g) and 10.5 thousand males {75-200 g) were randomly assigned to 10 ponds (750 m ) at a density of 600; 700 & 800 females and 300; 350 & 400 males per pond. Fish were exposed to different levels of water temperature ranging from 20.04 °C to 36.06 °C during the three spawning seasons.Oreochromis niloticus began to lay eggs at water temperature 20.06 "C. Spawning percentage increased during April; May and June were 23.82; 30.05 and 20.61 % at water temperature 20.04; 26.26 and 34.75 °C in three seasons respectivialy. During May, 2000, 2001 & 2002 female gave high number of fries /.m2/ day ; 7.85±1.73 ; 6.84±1.16 and 7.85±2.03 fries / m2 /day, respectivialy. Also, high female relative fecundity were 1.25±0.41; 1.76±0.24 and I.3±0.34 fries/g female body weight at three season, respectivialy. On the other hand, high fry production per spawn per female was 184.6i53.01; 149.26i31.87 and 143.26±25.37 fries / female, when water temperature was 20.04; 26.79 and 26.26 °C, respectivialy.It is evidant that the reproductive performance of Oreochromis niloticus could be maximized by holding broodstock under natural photoperiod in water temperature above 20°C, the optimal reproductive performance occurs through summer season during May. The optimal water temperature range was 28-31 °C and females with highest body weight started to spawn first and gave more total fries. | ||||
| Keywords | ||||
| reproductive performance; relative fecundity. Oreochromis niloticus; Water Temperature; earthen pond | ||||
|
Statistics Article View: 313 PDF Download: 571 |
||||
