Abstract
The study was conducted at the fish farm of the Department of Fish Sciences, Faculty of Agricultural Technology and Fish Sciences, Al-Neelain University. The purpose of the study is to compare the growth performance of different local strains of Nile tilapia (Oreochromis niloticus) to provide the necessary information for conducting research leading to genetic improvement of the locally farmed Nile tilapia. Fish fry used in the study were spawned by brooders collected from, Jebel Aulia Dam Reservoir (White Nile strain A) , Sennar Dam Reservoir (Sennar strain B), Lake Nubia (Halfa strain C) and khashm elgirba reservoier( Khashm elgirba strain D). The study was conducted for six weeks in twelve happas, each stocked with 30 fry in three replicates for each strain, averaging 5 g. Fish were fed by diet with a protein level of 35%. Statistical analysis showed Sennar strain was the best growth rate with a percent weight gain of 1529%, followed by white nile strain with a percent weight gain of 1114%, followed by khashm elgerba strain with a percent weight gain of 993% and finally Halfa strain with a percent weight gain of 829%. Daily Growth Rate gain was 0.9g/day for sennar strain, followed by other strain with no significant(≥0.05). Food Conversion Ratios (FCR) were best in sennar and white nile strain ,survival rate with the same no significant(≥0.05) between treatments. finally results indicated that there is significant( ≤ 0.05) between treatments so sennar and white nile strains is better than two strains in this study.
Highlights
Nile tilapia is one of the most commercially important and widely used fish in the global aquaculture production intropical and subtropical areas (Gjedrem, 2005;El-Sayed, 2006)
The strains included four African strains collected from Egypt, Ghana, Kenya and Senegal, and four cultured Asian strains known as the Israel, Singapore, Taiwan and Thailand strains, and they found that the performance of the African strains was similar or better than the performance of the Asian strains, and that the fastest growth achieved by the
In a comparison of eleven different strains of Nile tilapia collected from different African regions, Capili (1995) found that the Egyptian strain achieved the fastest growth rate while the growth of three Kenyan strains was relatively weak
Summary
Nile tilapia is one of the most commercially important and widely used fish in the global aquaculture production intropical and subtropical areas (Gjedrem, 2005;El-Sayed, 2006). The importance of Oreochromis niloticus seams from its biological reasons accepting artificial feeds, ease of breeding in captivity,disease resistance, high fecundity; social reasons: good table food quality, good market price; and physical reasons: tolerant to a wide range of environmental conditions (El-Sayed, 2006; Ashagrieet al., 2008). Selection of the best strains for efficient breeding program is crucial; to reach the production goal and to reduce production cost, to improve disease resistance, utilization of feed resources and product quality (Gjedrem, 1997). The general objective of this study was to compare the growth performance of different Oreochromis niloticus strains collected from various sudanes freshwater lakes (such as Lake sennar Lake white nile, Lake hallfa and Lake khash elgerba )
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