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Rania S. MABROKE, Osama M. EL-HUSSEINY, Abd El-Naem F. A. ZIDAN, Al-Azab TAHOUN, Ashraf SULOMA. Floc meal as potential substitute for soybean meal in tilapia diets under biofloc system conditions[J]. HaiyangYuHuZhao, 2019, 37(1): 313-320

Floc meal as potential substitute for soybean meal in tilapia diets under biofloc system conditions

Rania S. MABROKE1, Osama M. EL-HUSSEINY1, Abd El-Naem F. A. ZIDAN1, Al-Azab TAHOUN2, Ashraf SULOMA1
1 Fish Nutrition Laboratory(FNL), Animal Production Department, Faculty of Agriculture, Cairo University, 12613, Giza, Egypt;
2 Aquaculture Department, Faculty of Fish Resources, Suez University, Egypt
This study was conducted to evaluate the effect of replacing soybean meal (SBM) by low protein floc meal (LPFM; 24% CP) in tilapia diets on growth performance, feed utilization and fish chemical composition. Three isonitrogenous and isocaloric diets were formulated; control diet (C; without LPFM), FM25 (25% of SBM protein was substituted by LPFM) and FM50 (50% of SBM protein was substituted by LPFM). Nine 55l circular plastic tanks were stocked by 12 fish to form three experimental groups. No differences in tilapia performance were observed between the control and the FM25 diet. Chemical composition of fish did not differ significantly among treatments except for protein and selenium contents where the highest values were recorded in the control treatment. The highest mineral content was recorded in floc collected from the control tanks, while calcium content showed its highest value in floc collected from FM50 effluent. These data indicate that replacing soybean meal with LPFM up to 25%, had no negative effect on growth performance and potentially may improve the system sustainability. Meanwhile, the adverse effect of more inclusion of LPFM in tilapia diet may be attributed to the higher content of ash. In other word, minerals seem to cause more energy utilization in fish fed floc meal since it is needed to maintain osmotic homeostasis.
Key words:    microbial flocs|alternative protein sources|tilapia diet|sustainability   
Received: 2017-08-24   Revised: 2018-01-22
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Articles by Rania S. MABROKE
Articles by Osama M. EL-HUSSEINY
Articles by Abd El-Naem F. A. ZIDAN
Articles by Al-Azab TAHOUN
Articles by Ashraf SULOMA
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