International Journal of Aquaculture, 2017, Vol.7, No.6, 42
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50
45
Feed Conversion Ratio (FCR)
according to (Adewole and Awosusi, 2015)
Total Feed Intake (TFI)
according to (Oyelese, 2007)
TFI = Sum of the amount of feed fed the fish per week
Protein Intake (PI)
= Feed intake x % Protein in diet
Where:
N
I =
final number of fish at the end of experiment
N
0 =
initial number of fish at the beginning of experiment
The production cost in Naira of the experimental diets were calculated following the method of Faturoti and
Lawal (1986) and Mazid et al. (1997) based on the current market prices of the ingredients used for formulating
the diets.
Statistical analysis
Data collected were subjected to Analysis of Variance (ANOVA) at α
0.05
. Comparisons among treatment means
were separated using Duncan’s Multiple Range Test to determine the level of significance based on Statistical
Analysis System (SAS, 2008).
3 Results and Discussion
The total final weight attained ranged from 137.92 ±2.97 g to 916.67 ±17.98 g. The highest total final weight
value was from OGM2 diet, followed closely by 869.25 ±7.99 g from OGM3 diet, while the lowest was from the
fish fed OGM6 diet. The fish fed the OGM2 andOGM3 diets had significantly higher (p<0.05) total final weight
than fish fed OGM4 andOGM1 diets which were also significantly different (p<0.05) from the fish fed OGM5
andOGM6 diets respectively (Table 2).
Mean weight gain ranged from -6.22 ±0.24 g to 40.69 ±0.49 g, with the highest value was from OGM3 diet and
the lowest value was from fish fed OGM6 diets. The fish fed OGM2, OGM3, OGM4 diets had significantly
higher (p<0.05) mean weight gain than fish fed OGM1 diet, which was significantly different (p<0.05) from the
fish fed OGM5 and OGM6 diets respectively. Specific growth rate ranged from -0.24±0.01 (%/day) to 0.71 ±0.00
(%/day). The highest value was from fish fed OGM3 diet, while the lowest value was from fish fed OGM6 diet.
The fish fed OGM2, OGM3, OGM4 diets had significantly higher (p<0.05) specific growth rate than OGM1 diet,
which was also significantly different (p<0.05) from the fish fed OGM5, OGM6 diets respectively (Table 2).
Fish productivity index ranged from -35.87±1.36 to 1876.42±28.07, the highest value is from fish fed OGM2 diet
and the lowest value was from the fish fedOGM6 diet. The fish fed OGM2, OGM3, OGM4 diets had significantly
higher (p<0.05) fish productivity index than the fish fed OGM1 diet, which was significantly different (p<0.05)
from the fish fed OGM5, OGM6 diets respectively (Table 2). The final condition factor ranged from 0.48 ±0.04
to 0.69±0.03. The highest final condition factor value was from the control OGM1 diet, followed closely by
0.67±0.06 from OGM3 diet, while the lowest value was from OGM6 diet respectively. The fish fed the OGM1,
OGM3 diets had significantly higher (p<0.05) final condition factor than OGM2, OGM4 diets, which were
significantly different from OGM5, OGM6 diets. The percentage survival ranged from 65.00% to 90.00%. The
gain t
Fish weigh
feed of
Dry weight
FCR
(g) fed
protein
Crude
(g)
gain
Wet weight
(PER)
Ratio
Efficiency
Protein
100
N
N
0
I
% (S) Rate
Survival
