Effects of stocking density and water exchange rates on growth performances, production traits, feed utilization and body composition of mono-sex male Nile tilapia, Oreochromis niloticus (L.) cultured in concrete tanks  

Deyab M. S. D. El-Saidy , Ebtehal El-Sayed Hussein
Department of Poultry Production, Faculty of Agriculture, Minufiya University, Shebin El-Kom, P.O.Box 32516, Egypt
Author    Correspondence author
International Journal of Aquaculture, 2015, Vol. 5, No. 3   doi: 10.5376/ija.2015.05.0003
Received: 10 Feb., 2015    Accepted: 26 Mar., 2015    Published: 27 Apr., 2015
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El-Saidy and Hussein, 2015, Effects of stocking density and water exchange rates on growth performances, production traits, feed utilization and body composition of mono-sex male Nile tilapia, Oreochromis niloticus (L.) cultured in concrete tanks, International Journal of Aquaculture, Vol.5, No.3: 1-13 (doi: 10.5376/ija.2015.05.0003)

Abstract

A 44-week randomized factorial design 2 x 3 x 2 ( two water exchange rates, three stocking density and two replicates) rearing trial was conducted in concrete tanks with average initial weight and length of 7.5 ± 1.2 g/fish and of 8.9 ± 0.5 cm/fish of mono-sex male Nile tilapia, Oreochromis niloticus , to examine the effects of two water exchange rates and three stocking density on growth performances, production traits, feed utilization and body composition. Twelve concrete tanks 4 m3 each were stocked with either 200, 300 and 400 fish for each tank to give a stocking rate of 50, 75 and 100 fish /m3, respectively and mentioned at 8L/min. or 12 L/min. water exchange rates. The results revealed that, growth performance and feed utilization parameters were significantly (P£ 0.01) the best at the lowest stocking density. No significant differences (P > 0.05) were found between water exchange rates in terms of growth performance, feed utilization and all production traits. The lowest stocking density (50fish/m3) had significantly the best feed utilization parameters. There were no significant differences between it and the stocking density of 75fish/m3. Whole fish body composition % of protein, fat and ash contents were significantly (P £ 0.05) influenced by stocking density but did not influenced by water exchange rates. From the above results it can be concluded that, stocking density of 75 fish /m3 of mono-sex male Nile tilapia reared at either 8L/min or 12L/min. water exchange rates exhibited the highest net profit and would seem to be the most desirable density under this system conditions.

Keywords
Nile tilapia; Stocking density; Water exchange rates; Growth performances
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