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REARING SHARP-SNOUT SEABREAM (DIPLODUS PUNTAZZO) FINGERLINGS AT VARYING DIETARY PROTEIN AND LIPID LEVELS

REARING SHARP-SNOUT SEABREAM (DIPLODUS PUNTAZZO) FINGERLINGS AT VARYING DIETARY PROTEIN AND LIPID LEVELS,EL-SAYED HASSAN EL-EBIARY

REARING SHARP-SNOUT SEABREAM (DIPLODUS PUNTAZZO) FINGERLINGS AT VARYING DIETARY PROTEIN AND LIPID LEVELS   (Citations: 1)
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This experiment was carried out to assess the protein sparing effect of dietary lipid on growth performance, feed utilization, carcass composition and estimated cost of production of sharp-snout seabream (Diplodus puntazzo). Four supplemented diets formulated to contain 50% protein with 3% lipid, 45% protein with 6% lipid, 40% protein with 8% lipid and 35% protein with 10% lipid. Ten weeks feeding trial was carried out on sharp-snout seabream fingerlings, with a mean weight of 4.38± 0.1 g in eight-glass aquaria. Results showed no significant differences in growth of fish fed diet1 (50% protein and 3 % lipid), diet 2 (45 % P and 6 % L) or diet 3 (40% P and 8 % L), whereas fish fed diet 4, (35% P and 10 % L) showed the least growth rates among all. The best feed conversion ratio (FCR), efficiency of protein utilization in terms of protein productive value (PPV) and protein efficiency ratio (PER) as well as the energy utilization (EU) were achieved with diet 3 which contained 40% P and 8 % L. Carcass lipid level increased from 20.76% for fish fed diet 1 to 24.2% for fish fed diet 4, when dietary lipid level increased from 3 % to 10 % and therefore, the energy retention increased in fish. Also, there was a decrease in the level of carcass crude protein as dietary protein level decreased from 50% in diet 1 to 35% in diet 4. The least cost of kg fish production (9.04 LE/Kg fish), was recorded for fish fed diet 3 (40% protein and 8% lipid) followed by fish fed diet 4 (35%P & 10%L), (9.11 LE/Kg fish). The control diet that contained 50%P &3% L gave the highest cost of kg fish production (10.82 LE/Kg fish), followed by diet 2 (10.63 LE/Kg fish) that contained 45% P & 6% L. It is concluded that a supplemented feed with 40%P and 8%L was the best for feeding Sharp- snout seabream (Diplodus puntazzo) fingerlings, and addition of 8% lipid to the diet is sufficient enough as energy source. Sdfghh
Published in 2006.
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