THE EFFECT OF TIMING OF FEED SUPPLEMENTATION ON GROWTH PERFORMANCE AND PRODUCT/ON OF NILE TILAPIA, COMMON CARPAND SIL VER CARP IN POLYCULTURED FERTILIZED PONDS

THE EFFECT OF TIMING OF FEED SUPPLEMENTATION ON
GROWTH PERFORMANCE AND PRODUCT/ON OF NILE TILAPIA,

COMMON CARPAND SIL VER CARP IN POLYCULTURED FERTILIZED

PONDS

By
MOHSENABDEL-TAWWAB*j MOHAMMAD S. AYYAT;

ALIE. ABDELGHANY AND MOHAMMAD H. AHMAD

Hamn1ad,
“FISh Ecology
Sharqia,
Dept;
Egypt,
FISh
and
Nutrition l Animal
Dept,
Zagazig,
Production
Central
Sharqia,
Laboratory
Dept,
Egypt
Faculty
for
of
Aquaculture
Agriculture,
Research,
Zagatig
Abbassa,
University,
AboKey Words: Fish growth, Nile tilapia, common carp, silver carp, time of first feeding,
FeR, fish production, proximate analysis.
ABSTRACT
The time offirst application of artifiCial feed to fertilized earthen ponds
was evaluated Earthen ponds (surface area 1000 m2 each) were used in {his
study. Each pond was initially fertilized with 75 kg chicken manure two weeks
before fish stocking, then it was biweekly fertilized with 15 kg chickert manure,
2 kg urea (46.5%N) and 10 kg monosuperphosphate (15.5% P20J.J. To each
pond, 1000 fish ofNile tilapta; Oreochromis ntloticus (10-15 glfish), 200 fish
ofcommon carp; Cvprinus carpio (7-13 glfish) and 1000 fish of silver carp;
HVDovhthalmichthvs molitrix (1.5-2.0 glfish) were stocked Four treatments
were used in the present study. They differed in timing ofsupplementary feed
addition which was initiated as follows: after zero day (continued for 135
days; TJ), after 45 days (continued for 90 days; T2), after 90 days (continued
for 45 days; T3) and no added supplemental feed (control). Fish were fed at
rate of3% oflive body weight with fish diet (25% crude protein) tvlice daily,
The obtained results showed that the growth parameters ofNile tilapia and
common carp was maximized at TI and T2 with inSignificant
difference.
(P>0.05), meanwhile that of silver carp was maximized at ‘T3. The
Significant
maximum
one
was obtained
was obtained
overall
difference
at T2
at
fish
(1.04),