Gaber et al
Greener Journal of Agricultural Sciences Vol. 4 (1), pp. 001-008, January 2014.
Manuscript Number: 022013483
Effect of Partially Replacing Corn Meal by Date Stone on Growth Performance in Nile Tilapia Fingerlings, Diets Supplemented with Marjoram: Effects of Date Stone on Growth Nile Tilapia
Gaber M.M.1*, Labib E.H.2, Omar E.A.3, Zaki M.A.4 and Nour A.M.5
*1National Institute of Oceanography and Fisheries, Cairo Egypt.
2Research Center, Ministry of Agriculture and Land Reclamation, Dokki , Giza Egypt.
3Departments of Animal and Fish Production, Faculty of Agriculture, Saba Basha, Alexandria Univ., Egypt.
4,5Departments of Animal and Fish Production, Faculty of Agriculture, El Shatby, Alexandria Univ., Egypt.
*Corresponding Author’s Email: gabermagdy @ yahoo.com
3-month randomized factorial design 4x2 (four levels of Date
stone (DS) (0, 15, 30, and 45%), two levels (0 and 0.03%) of
Marjoram (M) and three replicates). The trial was conducted
in twenty four glass aquaria. Ten fingerlings of Nile
tilapia were placed in each aquarium with an average weight
15.40 ± 0.3 g fish. Fish were fed twice daily (six days a
week) at a rate of 3% of body weight. The results revealed
that, mean final weight (g/fish), SGR (% /day), feed
conversion ratio, PPV and PER, were significantly (p ≤ 0.05)
affected by the levels of DS and level of M. And the best
diet achieved which contain 15% DS and supplemented with
0.03 % M was not significantly different from control diet
in fish performance.
From the above results and the economic information of these study it can be concluded that, diet containing 15% of DS with 0.03% M exhibited the highest net profit and would seem to be the most desirable level of DS and M in the system studied.
Keywords: Nile tilapia, date stone, Marjoram.
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