International Journal of Aquaculture, 2016, Vol.6, No.7, 1
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10
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present study was aimed at assessing both the growth performances and survival rates of African catfish fry fed on
Soymilk based diets.
1 Result
1.1 Growth of African catfish fry
African catfish fry in treatment 1 (egg yolk based diet) was stocked at mean weight of 0.027 323 g ±0.004 66. Fry
in treatment 2 (diet based on soymilk prepared from raw soybeans) was stocked at mean weight of 0.026 43 g ±
0.004 334 while fry in treatment 3 (diet based on soymilk prepared from roasted soybeans) was stocked at a mean
weight of 0.320 0 ±0.004 359. ANOVA showed that the stocking sizes of fry in the three treatments did not differ
significantly (P = 0.65).
African catfish fry in treatment 1 (egg yolk based diet) had the highest mean final weight (0.657 67 g ±0.076 912).
However, this was found to be not statistically different (P = 0.8) to the mean final weight of fry in treatment 3
(diet based on soymilk prepared roasted soybeans) (0.611 10 g ±0.034 66). The mean final weight of fry was
found to be lowest in treatment 2 (diet based on soymilk prepared raw soybeans) (0.238 62 g ±0.028 185) and
this was significantly different from fry fed on diets based on egg yolk diet and soymilk from roasted soybean (P =
0.0028 and 0.0051, respectively) as presented in Table 1.
Table 1 Initial and final mean weights, Average Daily Weight Gain (ADWG), increase in body weight and specific growth rate (SGR)
of fry fed on soymilk and egg yolk based diet
PARAMETER
TRT 1 (Egg yolk)
TRT 2 (Soymilk from raw
soybeans)
TRT 3 (Soymilk from
roasted soybeans)
P-value
Initial avg. wt (g)
0.027 323 ±0.004 667
a
0.026 43±0.0043 34
a
0.032 00±0.004 359
a
0.65
Final avg. wt (g)
0.657 67±0.0769 12
b
0.238 62±0.028 185
a
0.611 10±0.0346 6
b
0.002
Avg. wt Gain (g)
0.633 0±0.0761 0
b
0.212 2±0.029 57
a
0.579 1±0.026 49
b
0.002
Body weight increase (%)
95.789 6±0.152 27
a
88.551 7±2.268 15
b
94.761 9±0.976 86
a
0.025
ADWG (g/d)
0.016 53±0.002 005
b
0.005 97±0.000 705
a
0.013 78±0.000 554
b
0.002
SGR (percentage/d)
7.922 4±0.920 9
b
5.528 8±0.540 67
a
7.25±0.451 86
b
0.015
Note:
*Means with different superscript within the rows indicates significant differences (p<0.05)
1.2 Survival rates of African catfish fry
The results of the experiment showed that survival of catfish fry is highest in fry fed on a diet based on soymilk
from roasted beans (treatment 3). This was however not statistically different to survival rate of catfish fed on a
diet based on soymilk from raw soybeans (treatment 2). Lowest survival was recorded in catfish fry fed on egg
yolk based diet (treatment 1). This was statistically lower than fry in treatments 2 and 3. Figure 1 below
summarizes the survival rate of African catfish fry after 42 days.
Figure 1 Final survival rate (%) of African catfish fry after 42 days of feeding
