International Journal of Aquaculture, 2016, Vol.6, No.12, 1
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11
6
differences noted with different storage conditions for six months. However, the values are within the
recommended ranges for the culture of various fishes (Andrews et al., 1973 reported 1.50% of calcium also for
I.
punctatus
, NRC 1983 recommended 0.50 of phosphorus for catfishes while Gatlin
et al
., 1982 recommended
0.04% of magnesium also for catfishes). The different commercial fish feed stored in open conditions for the
period of six months were observed to have physical deterioration after the third month (Table 5), these changes
includes; color change, abit soft text of the feed, mouldy growth, unpleasant smell indicating the presence of
rancidity and little insect population (Table 6). This is in line with De Silva
et al.,
(1995) that reported improper
flavor and appearance changes during storage also feed lump and less palatability was reported.
Table 4 Laboratory analysis of some nutritional macro elements of feeds stored at the airtight and open condition.
Manufactory label
P
Ca
Na
Coppens
®
0.09
1.0
0.4
Multifeed
®
1.2
2.2
-
Vitafeed
®
1.1
2.7
-
Mean Monthly Macro elements
November
P
Ca
Mg
Fe
Coppens
®
Airtight
1.17±0.01
d
1.60±0.01
c
0.29±0.02
c
1.82±0.00
e
Coppens
®
Open
0.96±0.01
e
1.0±0.11
d
0.29±0.02
c
1.50±0.01
f
Multifeed
®
Airtight
2.98±0.01
a
1.2±0.02
b
0.35±0.01
b
0.70±0.00
c
Multifeed
®
Open
1.28±0.02
b
1.2±0.03
b
0.35±0.02
b
0.65±0.01
d
Vitafeed
®
Airtight
0.79±0.01
f
2.7±0.02
a
0.78±0.01
a
2.36±0.02
b
Vitafeed
®
Open
1.21±0.01
c
2.7±0.09
a
0.78±0.01
a
2.94±0.01
a
p-value
<0.001
<0.001
<0.001
<0.001
December
P
Ca
Mg
Fe
Coppens
®
Airtight
1.00±0.01
e
0.97±0.01
e
1.28±0.02
cd
1.39±0.02
d
Coppens
®
Open
1.23±0.01
b
0.93±0.01
f
0.27±0.02
d
1.53±0.02
c
Multifeed
®
Airtight
1.52±0.01
a
1.00±0.02
c
0.29±0.01
c
1.23±0.01
e
Multifeed
®
Open
1.16±0.04
c
0.96±0.03
d
0.28±0.02
cd
1.05±0.01
f
Vitafeed
®
Airtight
1.05±0.01
d
2.00±0.02
a
0.58±0.02
a
2.23±0.02
b
Vitafeed
®
Open
1.04±0.01
d
1.60±0.01
b
0.46±0.05
b
2.41±1.05
a
p-value
<0.001
<0.001
<0.001
<0.001
January
P
Ca
Mg
Fe
Coppens
®
Airtight
1.27±0.01
b
1.27±0.01
d
0.26±0.02
c
2.42±0.02
c
Coppens
®
Open
1.26±0.01
c
1.26±0.01
d
0.23±0.04
d
2.42±0.09
c
Multifeed
®
Airtight
1.37±0.01
b
1.37±0.02
c
2.28±0.01
b
1.30±0.10
d
Multifeed
®
Open
1.38±0.02
a
1.38±0.03
c
0.27±0.01
bc
1.47±0.01
b
Vitafeed
®
Airtight
1.15±0.01
e
2.00±0.02
a
0.57±0.01
a
2.47±0.01
b
Vitafeed
®
Open
1.16±0.01
d
1.97±0.03
b
0.57±0.02
a
2.74±0.02
a
p-value
<0.001
<0.001
<0.001
<0.001
February
P
Ca
Mg
Fe
Coppens
®
Airtight
0.67±0.01
c
2.40±0.01
c
0.70±0.02
c
1.63±0.00
d
Coppens
®
Open
0.79±0.01
b
2.65±0.11
b
0.77±0.021
b
2.53±0.01
a
Multifeed
®
Airtight
1.67±0.01
c
2.69±0.01
a
0.78±0.01
a
1.10±0.00
e
Multifeed
®
Open
0.66±0.02
c
2.40±0.01
c
0.78±0.02
a
1.09±0.01
e
Vitafeed
®
Airtight
0.88±0.01
a
2.00±0.00
d
0.58±0.01
d
2.35±0.02
c
Vitafeed
®
Open
1.20±0.01
d
1.94±0.00
e
0.56±0.01
e
2.44±0.01
b
p-value
<0.001
<0.001
<0.001
<0.001
Coppens
®
Airtight
0.90±0.01
e
1.00±0.01
d
0.29±0.02
e
1.08±0.02
b
Coppens
®
Open
1.08±0.01
c
0.79±0.01
f
0.23±0.02
f
0.66±0.02
d
Multifeed
®
Airtight
1.58±0.01
b
1.20±0.02
c
0.35±0.01
d
1.88±0.01
a
