International Journal of Marine Science 2016, Vol.6, No.34, 1-7
3
SPSS version 11.5 (Chicago, USA). Significant differences were determined among treatments at the 5% level (P
< 0.05).
Results
Growth responses of
T. zillii
after 28 d of feeding are summarized in Table 1. The results of this present study
revealed that fish group fed on garlic powder (GP) at 3% graded level had higher final weight (FW) of 7.59g
followed by fish group fed on GP at 2%/kg diet (4.34g) while the least final weight of 3.18g was recorded in the
control diet (0%). Growth responses of
T. zillii
in terms of FW and MWG were significantly affected by the GP (P
< 0.05) as shown in Table 1 and Figure 1. Fish in all treatments gradually grew with time, and the highest
individual weight was obtained in the 4
th
week (28 d) as shown in Figure 1, and there was also a steady increase in
the average mean weight gain from week zero to the 4
th
week.
Table 1 Effects of different levels of garlic-containing diets on the growth performance and feed utilization of
T.zilli
under laboratory
conditions.
Parameters
Dried Garlic graded Level
(% / kg diet)
0
1
2
3
Initial weight (g)
0.03
0.03
0.03
0.03
Final weight (g)
3.18
3.48
4.34
7.59
Mean weight gain (g)
3.15
3.45
4.31
7.56
Average daily gain (mg/fish/day)
0.112
0.123
0.154
0.270
Relative growth rate (%)
10500
11500
14366.7
25200
Specific growth rate (%/day)
16.65
16.97
17.76
19.76
Survival rate (%)
66.70
80.00
86.70
93.30
Feed intake (g feed/fish)
5.21
5.44
5.51
5.22
Feed conversion ratio
1.65
1.57
1.27
0.69
Feed efficiency ratio
0.60
0.63
0.78
1.45
Figure 1 Bi-weekly weight gain of
T. zilli
fed Garlic-supplemented diets.
The highest amounts of dry feed intake (5.51 g/fish/day) were seen in fish groups fed on GP at 2% graded level
while the least (5.21g/fish/day) was recorded in the fish group fed the basal diet (control group at 0% graded level)
as shown in Figure 2.In this study, it was observed that the feed intake increased with increasing
Allium sativum
with the exception of the group fed at 3% graded level.
Fish fed GP at 3% graded level had the best feed conversion ratio (FCR) of 0.69 and were able to convert the feed
better to flesh while the worst FCR of 1.65 was recorded in fish fed basal diet without garlic (0% inclusion rate).
