Hassan,, A., Mahmoud, A., Sayed, S. (2006). EFFECT OF METHOD AND RATES OF FEEDING ON THE GROWTH PERFORMANCE AND FEED UTILIZATION OF MONOSEX TILAPIA NILOTICA (Oreochromfs nfloti'cus L.) IN SEMI-INTENSIVE CULTURE SYSTEM. Journal of Animal and Poultry Production, 31(5), 2743-2753. doi: 10.21608/jappmu.2006.235487
A. A. Hassan,; A. A. Mahmoud; S. H. Sayed. "EFFECT OF METHOD AND RATES OF FEEDING ON THE GROWTH PERFORMANCE AND FEED UTILIZATION OF MONOSEX TILAPIA NILOTICA (Oreochromfs nfloti'cus L.) IN SEMI-INTENSIVE CULTURE SYSTEM". Journal of Animal and Poultry Production, 31, 5, 2006, 2743-2753. doi: 10.21608/jappmu.2006.235487
Hassan,, A., Mahmoud, A., Sayed, S. (2006). 'EFFECT OF METHOD AND RATES OF FEEDING ON THE GROWTH PERFORMANCE AND FEED UTILIZATION OF MONOSEX TILAPIA NILOTICA (Oreochromfs nfloti'cus L.) IN SEMI-INTENSIVE CULTURE SYSTEM', Journal of Animal and Poultry Production, 31(5), pp. 2743-2753. doi: 10.21608/jappmu.2006.235487
Hassan,, A., Mahmoud, A., Sayed, S. EFFECT OF METHOD AND RATES OF FEEDING ON THE GROWTH PERFORMANCE AND FEED UTILIZATION OF MONOSEX TILAPIA NILOTICA (Oreochromfs nfloti'cus L.) IN SEMI-INTENSIVE CULTURE SYSTEM. Journal of Animal and Poultry Production, 2006; 31(5): 2743-2753. doi: 10.21608/jappmu.2006.235487
EFFECT OF METHOD AND RATES OF FEEDING ON THE GROWTH PERFORMANCE AND FEED UTILIZATION OF MONOSEX TILAPIA NILOTICA (Oreochromfs nfloti'cus L.) IN SEMI-INTENSIVE CULTURE SYSTEM
2Department of Fish Nutrition. Central Laboratory for Aquaculture Research. Abbassa. Abo- Hammad. Sharkla Governorate. Egypt.
Abstract
This study was carried out to investigate the effect of method and rates of
feeding on growth performance. feed utilization and econmic evaluation for
Oreochromis niloir'cus L. reared in aerated earthen ponds. Nine rectangular earthen
ponds. each of a total area of one feddan, representing nine treatments,i.e. three
different methods of feeding ( hand feeding. automatic feeder and demand feeder )
within each of three feeding rates ( 3. 4 and 5 % of total biomass of fish )were tested .
Experimental fish were fed on a commercial diet ( 25% CP and 4100 Kcal I kg diet)
and ponds were fertilized with 100 kg organic fertilizer ( chicken manure . devlded
into two portions) monthly . One paddle wheel aerator ( 1 horse power) per pond was
used to increase the rate of oxygenation of pond water . The pond water was
completiy changed every 30days. The experiment expanded 16 weeks after start.
Results obtained can be summarized as follows:
The water quality measurements were found to be within the normal range of
tolerance and for the well being of monosex Nile tilapia. 1
Results obtained at the end of the experiment for the growth performance of
monosex Nile tilapla represented in body weight ( BW). weight gain (W6).
accumulative growth rate(AGR). total yield ( TY) .feed intake ( Fl). and feed
conversion ratio ( FCR) showed that fish fed by automatic feeder at 5% feeding rate
of tilapia biomass I day exhibited superior growth performance rather than those
reared on demand feeder and hand feeding at 3% and 4% of tilapia biomassf day.
Statistical evalation of the results showed that the differences among the experimental
groups were significant ( p s 0.05 ) .
Based on the results obtained, it could be recommended that using the
automatic feeder method with 5% of biomass! day as a feeding rate for monosex Nile
tilapia cultured in earthen ponds at stocking density of 50 fishfm" with using a paddle
wheel aerator per pond must be used to increase the rate of oxygenation of pond
water to obtain higher yield and economic net profit .
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