ABDEL-GHANY, A., EID, A., HERMIS, I., IBRAHIM, H. (1995). DIGESTIBILITY OF FEED AND GROWTH RESPONSE OF GREY MULLET (MUGIL CEPHALUS L.) FED ON NATURAL FOOD AND/OR FORMULATED DIET IN FRESH WATER PONDS. Egyptian Journal of Agricultural Research, 73(3), 841-860. doi: 10.21608/ejar.1995.442190
ALY E. ABDEL-GHANY; A. E. EID; I. H. HERMIS; H. I. IBRAHIM. "DIGESTIBILITY OF FEED AND GROWTH RESPONSE OF GREY MULLET (MUGIL CEPHALUS L.) FED ON NATURAL FOOD AND/OR FORMULATED DIET IN FRESH WATER PONDS". Egyptian Journal of Agricultural Research, 73, 3, 1995, 841-860. doi: 10.21608/ejar.1995.442190
ABDEL-GHANY, A., EID, A., HERMIS, I., IBRAHIM, H. (1995). 'DIGESTIBILITY OF FEED AND GROWTH RESPONSE OF GREY MULLET (MUGIL CEPHALUS L.) FED ON NATURAL FOOD AND/OR FORMULATED DIET IN FRESH WATER PONDS', Egyptian Journal of Agricultural Research, 73(3), pp. 841-860. doi: 10.21608/ejar.1995.442190
ABDEL-GHANY, A., EID, A., HERMIS, I., IBRAHIM, H. DIGESTIBILITY OF FEED AND GROWTH RESPONSE OF GREY MULLET (MUGIL CEPHALUS L.) FED ON NATURAL FOOD AND/OR FORMULATED DIET IN FRESH WATER PONDS. Egyptian Journal of Agricultural Research, 1995; 73(3): 841-860. doi: 10.21608/ejar.1995.442190
DIGESTIBILITY OF FEED AND GROWTH RESPONSE OF GREY MULLET (MUGIL CEPHALUS L.) FED ON NATURAL FOOD AND/OR FORMULATED DIET IN FRESH WATER PONDS
1Central Laboratory of Aquaculture Research, Abbassa, Agricultural Research Centre, Giza, Egypt
2Animal Production Department, Faculty of Agriculture, Suez Canal University, Ismailia, Egypt
Abstract
Two sequential feeding experiments were carried out with grey mullet . In the first experiment,three treatments were applied in freshwater earthen ponds,and each treatment (TRT) was replicated in three of ponds. TRT-A„ fish fed on the available natural food induced by a pond fertilization programme . TRT-B, fish received the available natural food induced by the same pond fertilization programme as in TRT-A in addition to a supplemental formulated diet at a rate of 3% body weight. TRT-C, fish exclusively fed on the same formulated diet as used in TRT-B but at a rate of 5% body weight. At the end of the experiment, the highest mean weight of fish resulted from TRT-C,followed in order by TRT-B and TRT-A The daily weight gains of fish were 0.37 g,0.41 g and 0.46 g for TRT-A,TRT-B and TRT-C, respectively . The weight gain of TRT-C and TRT-B exceeded that of TRT-A by 24.1% and 11.7%, respectively.Fish of TRT-C had also the highest protein,fat,ash and gross energy deposition in their body, and thus , produced the most nutritious fish among the other treatments . The study clearly indicated that the grey mullet had the ability to digest and utilize the artificial diet. The efficiency of feed utilization by grey mullet was determined for TRT-B and TRT-C and the data were as follows :3.6 & 5.6 for food conversion ratio, 79% & 51% for prtein efficiencey ratio, 14.8% & 10.1% for productive protein value and 1 5.7% & 10.3% for energy retention value, respectively . These values may be used to evaluate the diet as it had moderate utilization
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