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A 54-day feeding experiment was conducted on juvenile Nile tilapia using isonitrogenous, isocal-oric semipurified diets. The carbohydrate content in the diet was 9%, 32% and 50%; the corresponding lipid content was 22.2%, 12%, and 4%. The diets were supplemented with 0.85% or 1.5% phosphorus and 40 mgAg or 100 mgAg zinc. The experiment was carried out in flow-through aquaria using dechlorinated tap water at 23 - 26℃.The experiment showed that the increase of the carbohydrate content in the diets resulted in a 43-249% increase in weight gain, a 27-59% decrease in feed conversion ratio, and a 65-121% in crease in protein efficiency ratio. In fish fed diets containing 36-50% carbohydrate, an increase in supplemented phosphorus to 1.5% greatly increased the weight gain. On the contrary , a high content of supplemented zinc (100 mgAg) inhibited growth and increased feed conversion ratio.
A 54-day feeding experiment was conducted on juvenile Nile tilapia using isonitrogenous, isocal-oric semipurified diets. The carbohydrate content in the diet was 9%, 32% and 50%; the corresponding lipid content was 22.2%, 12%, and 4 %. The diets were supplemented with 0.85% or 1.5% phosphorus and 40 mg Ag or 100 mg Ag zinc. The experiment was carried out in flow-through aquaria using dechlorinated tap water at 23 - 26 ° C. The experiment showed that the increase of the carbohydrate content in the diets resulted in a 43-249% increase in weight gain, a 27-59% decrease in feed conversion ratio, and a 65-121% in crease in protein efficiency ratio. , an increase in supplemented phosphorus to 1.5% greatly increased the weight gain. On the contrary, a high content of supplemented zinc (100 mgAg) inhibited growth and increased feed conversion ratio.