AI-Owafeir,, M. (2003). THE INFLUNCE OF DIFFERENT PHOTOPERIODS ON GROWTH, FEED UTILISATION AND CHEMICAL COMPOSITION OF NILE TILAPIA Oreochromis niloticus. Journal of Food and Dairy Sciences, 28(2), 1237-1243. doi: 10.21608/jfds.2003.245950
M. A. AI-Owafeir,. "THE INFLUNCE OF DIFFERENT PHOTOPERIODS ON GROWTH, FEED UTILISATION AND CHEMICAL COMPOSITION OF NILE TILAPIA Oreochromis niloticus". Journal of Food and Dairy Sciences, 28, 2, 2003, 1237-1243. doi: 10.21608/jfds.2003.245950
AI-Owafeir,, M. (2003). 'THE INFLUNCE OF DIFFERENT PHOTOPERIODS ON GROWTH, FEED UTILISATION AND CHEMICAL COMPOSITION OF NILE TILAPIA Oreochromis niloticus', Journal of Food and Dairy Sciences, 28(2), pp. 1237-1243. doi: 10.21608/jfds.2003.245950
AI-Owafeir,, M. THE INFLUNCE OF DIFFERENT PHOTOPERIODS ON GROWTH, FEED UTILISATION AND CHEMICAL COMPOSITION OF NILE TILAPIA Oreochromis niloticus. Journal of Food and Dairy Sciences, 2003; 28(2): 1237-1243. doi: 10.21608/jfds.2003.245950
THE INFLUNCE OF DIFFERENT PHOTOPERIODS ON GROWTH, FEED UTILISATION AND CHEMICAL COMPOSITION OF NILE TILAPIA Oreochromis niloticus
Aquatic Development Resources Dept., College of Agric. And Food Sci., King FalsaJ University, PO Box 420, AI-Ahassa, 31982 KSA
Abstract
To study the influence of different photoperiodS on growth, fed utilisation and chemical composition of Nile tilapia, Fingerlings (4.21 0.1g) of O. niJolicus were reared under five photo periods. OOL:240, 08L:160, 12L:120. 16L:08D and 24L:OOO. Over 56 days experimental period, fish exposed to OOl:240 cycle showed a lower specific growth rate, a lower feed intake, a higher food conversion ratio, a I<>wer protein efficiency ratio snd a lower protein productive value compared with those exposed to 24L:OOO cycle. Growth and feed utilisation data ranged from 2.57 to 2.11, 21.70 to 17.13,1.63 10 1.83, 1.94 to 1.72 and 31.771026.71 forspecificgrowth,feedinlake, food conversion ralio, protein efficiency ratio and protein productive value respectively being highest for fish reared under continuous light. In terms of carcass cornpcsitlon. there were no differences regarding moisture, crude protein, crude lipid and ash contents among all tested groups. Present results show that continuous light stimulates the activity of fish, increases feed intake and then enhances the growth rate and feed utilisation parameters of fish; whereas continuous dark inhibit the activity of fish, reduce feed intake and deCl"ea~ed 9fCW\h rate and feed utilisation parameters.
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