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International Journal of Aquaculture, 2014, Vol.4, No.22 1
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Fish in treatment 4 (T4), with 0.48kg quail manure
showed the best (P<0.05) growth performance (Figure
1), with the final average body weight of 47.55g. Slow
and inconsistent growth was however, observed in
treatments 5 (T5).
Figure 1 Mean body weight of
T. rendalli
reared in
experimental tanks for 14 weeks
Growth trends of
Tilapia rendalli
supplied with
different rate of quail manure are shown in Fig.1. The
significant (P<0.05) growth of fish was influenced by
the Quail manure application rates at all water
temperature. All the treatments showed fast and
constant growth during the onset of the experimental
period except T5, which had the highest amount of
quail manure. Furthermore, after the third week, a
pronounced difference in growth rate of fish was
observed between the treatment groups and this
difference was significant (ANOVA, P<0.05) (Fig. 1).
However, T1 (control), recorded steady and constant
growth throughout the experimental period.
Meanwhile, Table 1 shows the mean final body
weight of fish that varied from 26.23g to 47.55g
with highly significant differences between treatments
(p<0.05).
Table 1 Growth performance of
T
.
rendalli
raised under fertilized ponds for 14 weeks
Parameters
T1
T2
T3
T4
T5
QM application rate (kg/wk/2 m
2
) 0.00
0.32
0.40
0.48
0.64
Initial mean weight ±SE (g)
12.704±0.37
14.096±0.06
13.188±0.12
13.744±0.18
15.192±0.14
Final mean weight ±SE (g)
29.06±1.66
a
26.23±1.62
a
32.45±1.27
a
47.55±2.7
b
31.4±3.34
c
Weight gain (g)
16.356
12.134
19.262
33.806
16.208
daily growth rate (g day
-1
)
0.17
0.12
0.2
0.34
0.17
Weight gain (%)
128.75
86.08
146.06
245.97
106.69
SGR%/ day
0.844
0.634
0.919
1.267
0.741
Initial SL (mm)
56.36
60.92
57.8
60.84
63.68
Final SL (mm)
89.5
86.4
89.8
110.4
91.8
Initial TL (mm)
75.16
77.44
75.76
79.08
82.08
Final TL (mm)
118.5
111
117.3
140.1
122.5
Survival rate (%)
85.28
96.83
89.22
95.44
60.67
Note: *Value are means ±s.e. means within same column not sharing a common superscript are significantly different (p<0.05)
The study showed that Treatments 5 (T5) and 4
(T4) were significantly different from each other
while others were not. Final total length ranged
from 111mm± 2.29mm to 140.1mm ± 2.29mm
respectively. Survival rate in all treatments was very
high, with the lowest being above 60% (Table 1).
The key water quality parameters such as pH, DO,
Temperature and Ammonia were not significantly
different among the treatment groups (ANOVA, P >
0.05, Table 2).
Table 2 Water quality parameters during 14 weeks experimental period (Mean ±SE)
Treatment
Water Temp.(
o
C)
DO(mg L
-1
)
pH
TAN
*
Unionized ammonia (mg L
-1
)
1
23.81±0.84
5.98±0.33
7.67±0.12
0.32±0.31
0.0057
2
24.11±0.87
6.13±0.36
7.71±0.13
0.467±0.29
0.0084
3
24.13±0.87
6.03±0.28
7.81±0.14
1.03±0.02
0.0184
4
23.91±0.87
6.02±0.31
7.33±0.14
1.30±0.13
0.0233
5
24.27±0.86
6.12±0.31
7.30±0.16
1.98±1.25
0.0354
Note:
*
TAN = Total ammonia-nitrogen in mg L
-1