International Journal of Aquaculture 2015, Vol.5, No.34, 1-7
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Table 4 Specific growth rate (% /day/fish) (mean
±
SE) of Nile tilapia fingerlings
Ponds
Experimental period (day)
Average
15
30
45
60
75
90
105
120
P1
0.2±
0.04
c
0.9±
0.04
c
1.8±
0.04
c
0.2±
0.08
c
1.5±
0.02
c
1.2±
0.05
c
0.9±
0.01
c
1.0±
0.23
c
0.96±
0.04
c
P2
1.5±
0.05
b
3.2±
0.04
a
2.1±
0.06
a
1.9±
0.02
a
1.7±
0.02
b
1.3±
0.02
b
1.6±
0.09
a
1.2±
0.11
a
1.85±
0.04
b
P3
2.9±
0.07
a
2.2±
0.06
b
2.2±
0.05
a
1.9±
0.07
a
1.9±
0.07
a
1.8±
0.08
a
1.7±
0.05
a
1.4±
0.06
a
2.01±
0.03
a
Note: Means with the same letter in each column are not significantly different (P>0.05)
Table 5 Water temperature (oC) (mean±SE) recorded in each experimental altitude during the experimental period
Ponds
Experimental period (Days)
15
30
45
60
75
90
105
120
AVG
P1
15.5±
0.46
c
15.7±
1.14
c
15.6±
1.15
c
16.4±
0.67
c
15.7±
1.05
c
16.1±
0.91
c
16.5±
0.65
c
16.4±
0.61
c
16.1±
0.25
c
P2
20.5±
0.56
b
20.8±
0.97
b
20.7±
1.07
b
20.7±
1.07
b
21±
0.96
b
21.6±
0.76
b
21.4±
0.82
b
21.7±
0.71
b
21.2±
0.27
b
P3
25.4±
0.56
a
25.6±
0.45
a
25.8±
0.51
a
26.1±
0.43
a
26.7±
0.15
a
26.7±
0.27
a
26.8±
0.27
a
26.9±
0.23
a
26.3±
0.16
a
Note: Means with different letter in each row are significantly different (P<0.05)
Table 6.Nitrate and Total phosphorus in the pond water (mean±SE)
Ponds
Parameter
October
November
December
January
February
P1
Nitrate (NO
3
)(mg/l)
2.3±0.03
2.6±0.06
2.6±0.12
2.7±0.09
2.8±0.06
T. Phosphorus (mg/l)
0.01±0.003
0.01±0.003
0.02±0.006
0.03±0.006
0.04±0.012
P2
Nitrate (NO
3
)(mg/l)
2.5±0.12
3.7±0.06
4.5±0.12
4.8±0.06
5.3±0.06
T. Phosphorus (mg/l)
0.01±0.006
0.13±0.006
0.14±0.006
0.15±0.009
0.17±0.009
P3
Nitrate (NO
3
)(mg/l)
5.7±0.09
6.1±0.06
6.2±0.06
6.3±0.09
6.9±0.03
T. Phosphorus (mg/l)
0.02±0.003
0.18±0.03
0.22±0.006
0.23±0.006
0.25±0.012
