EFFECT OF DIFFERENT LEVELS OF ZINC ON GROWTH PERFORMANCE AND GONADOSOMATIC INDEX OF NILE TILAPIA (OREOCHROMIS NILOTICUS) FEMALES | ||
| Egyptian Journal of Agricultural Research | ||
| Article 25, Volume 86, Issue 2, July 2008, Pages 723-730 PDF (2.36 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejar.2008.205788 | ||
| Author | ||
| AHMED M. KHATER | ||
| Central Laboratory For Aquaculture Research Abbassa, Agricultural Research Center, Giza, Egypt | ||
| Abstract | ||
| The present experiment was conducted at the Central Laboratory for Aquaculture research in order to investigate the optimum growth performance, survival rate and gonadosomatic index of (Ore:rim:01s nilottus) females reared in glass aquaria as affected with different levels of zinc. The experimental system consisted of 18 experimental glass aquaria (80x40x50 an). Each aquarium was stocked with 10 of (0. niketus) females, which fed diets with different levels of zinc 0.0, 10, 25, 50, 75 and 100 mg / kg diet, respectively. The results indicated that there were significant differences in growth performance among zinc levels feed. The averages of final body weight, weight gain and daily weight gain showed that the highest results were obtained from the level 25 mg Zn / kg diets followed in a decreasing order by 50, 75, 100 and 0.0 mg Zn (the control) levels. The survival rate at 25 mg Zn / kg diets was the highest results than other treatments. The highest value of gonadosomatic index (2.14) was obtained from level of 50 mg Zn / kg diets than other treatments: The present results found that the optimal growth performance, survival rate and gonadosomatic index of (Oreochirmis nlletticits)' females fingerlings was obtained from level of 25 mg Zn / kg diets. | ||
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