EFFECT OF FEEDING LEVELS ON GROWTH PERFORMANCE OF NILE TILAPIA (Oreochromis niloticus L.) FINGERLINGS REARED IN CAGES AT WADI EL RAYIAN LAKES, FAYOUM GOVERNORATE. | ||
| Journal of Animal and Poultry Production | ||
| Article 3, Volume 30, Issue 11, November 2005, Pages 6543-6551 PDF (2.54 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jappmu.2005.238439 | ||
| Author | ||
| A. M. Yones, | ||
| National Institute of Oceanography and Fisheries, Shakshouk Aquatic Research Station at EI Fayoum, Egypt. | ||
| Abstract | ||
| The experimental was carried out in the second lake of Wadi EI- Rayian Lake at Fayoum Governorate. Twelve floating cages were used as experimental units, each cage measures 7x 7x x2 m with submerged depth 1 m (net volume=49 m\ Fingerlings of Nile tilapia with an initial average weight of 22g ±O.7g were randomly distributed into cages at 30 fish/m3 with total biomass of 1470 fish in each cage. Four treatments were conducted to study the effect of feeding levels on performance of tilapia. In the T1, fish were fed on the available natural food, whereas in T2 and T3, the fish fed daily at 3 and 5% from their body weight, respectively. However in the fourth treatment (T4), fish were fed to apparent satiation. The commercial pelleted diet (25% C.P.) was offered two timesl day. The Performance of tilapia showed Significant differences among treatments (p < 0.05). The best performance records for gain, GR, SGR. and PER were obtained with the fish fed to apparent satiation (T 4), followed in a decreasing order by fish fed daily at 3% from their body weight. On the other hand, fish depended only on the natural food and which received 5% of B.W., showed inferior performance parameters compared with the other treatments. The carcass composition of tilapia was not affected by feeding levels, except that of fish fed 5% B.W. which gave less increase in their body fat content. In the same trend, the blood characteristics of tilapla (hematocrite. hemoglobin and plasma protein content) were not affected by feeding levels. The total fish production and net returns showed an increase in yields for the .cages fed to apparent satiation. It could be concluded that fish fed to apparent satiation (feed amount equivalent 2.7% of body weight/day) enhance the growth performance, blood characteristics and yields of tilapia Oreochromis niloticus . | ||
| Keywords | ||
| Fish; Cage culture; Growth performance; Feeding levels; carcass composition; Blood characteristics; Oreochromis niloticus | ||
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