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Mansoura University, Egypt
In the present work, feeding O. niloticus fish on diets containing different levels of betaine (0.0, 0.5 and 1.0%) and stocked at three densities (2, 3 and 4 g fish/liter) led to some results which could be summarized in the following points. The results clearly showed that the diets containing (1% and 0.5% betaine) were slightly better in all the tested parameters than the control, but on the other hand the results clearly showed that the fish stocked at 2g fish/l and 3g...