International Journal of Aquaculture, 2016, Vol.6, No.15, 1
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13
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Sampling and Data collection:
The length and weight of fish in each tank was measured to determine the
different rearing indices such as: mean weight gain, specific growth rate, relative growth rate, nutrient utilization
parameters, condition factor and survival rate by Ajayi et al. (2013) and Adewole, (2016).
Where:
W
0 =
initial mean weight
W
1=
final mean weight
Where:
Ln = Natural log
W
0 =
initial mean weight
W
1 =
final mean weight
Where:
W = final weight
L = Final standard length
Where:
N
I =
final number of fish at the end of experiment
N
0 =
initial number of fish at the beginning of experiment
Haematological and serum biochemical study
The blood collection was done before and after the feeding trials. Fish samples were selected from the various
treatment tanks and blood was collected through the caudal vein using a hypodemic needle into 2 sets of sample
bottles. One set contained ethylene diamine tetra acetic acid (EDTA) as anticoagulant, which was used for
haematological analysis according to Ajayi et al., (2013), while the second set without EDTA was used for serum
biochemical analysis as earlier described by Adewole and Gbore (2006).
(g) fed
protein
Crude
(g)
gain
Wet weight
= (PER)
Ratio
Efficiency
Protein
gain t
Fish weigh
feed of
Dry weight
= (FCR)
Ratio
Conversion
Feed
100
N
N
0
I
% (S) Rate
Survival
3
L
100 W
(K)
Factor
Condition
(g) t
body weigh
Initial
100
(g)
fish
by
gain
Weight
(RGR)
Rate
Growth
Relative
T
100 ) W-
(Ln W
0
1
(SGR)
Rate
Growth
Specific
0
1
W-W
(MWG)
Gain
Weight
Mean
