International Journal of Aquaculture, 2013, Vol.3, No.17, 92
-
100
http://ija.sophiapublisher.com
95
of
A. sobria
and 8% of
A.
veronii
from water samples
were sensitive to sulfafurazole.
Resistance exhibited
to other antibiotics by the isolates from fish and water
samples are given in Table 3 and Table 4 respectively.
Table 3 Antibiotic resistance of motile aeromonads from fish samples
Name of antibiotics
Percentage of strains exhibiting resistance
A. sobria
A. caviae
A. veronii
A. hydrophila A. trota
A. jandaei
A. shubertii
Amoxicillin (30)
100.00
100.00
100.00
100
100.00
100.00
100
Carbenicillin (100)
76.05
60.00
80.00
70
66.66
100.00
100
Cefpodoxime (10)
18.30
43.63
13.33
80
6.66
0
0
Ceftazidime (30)
5.63
0
13.33
0
0
0
0
Cephalothin (30)
18.30
56.36
0
100
26.66
33.33
0
Chloramphenicol (30) 0
0
0
0
0
0
0
Ciprofloxacin (5)
0
0
0
0
0
0
0
Gentamicin (10)
0
0
0
0
0
0
0
Nalidixic acid (30)
35.21
63.63
73.33
40
53.33
66.66
0
Nitrofurantoin (100)
0
3.63
0
0
0
0
0
Streptomycin (10)
28.16
18.18
33.33
30
20.00
0
0
Sulphafurazole (300)
0
3.63
0
0
0
0
0
Tetracycline (30)
29.57
38.18
13.33
40
20.00
50.00
0
Trimethoprim (5)
0
9.09
0
10
6.66
0
0
Table 4 Antibiotic resistance of motile aeromonads isolates from water samples
Name of antibiotics
Percentage of strains exhibiting resistance
A. sobria
A. caviae
A. veronii
A. hydrophila A. trota
A. jandaei
A. shubertii
Amoxicillin (30)
100.00
100.00
100
100
100.00
100.00
100.0
Carbenicillin (100)
71.42
60.00
88
80
87.50
100.00
62.5
Cefpodoxime (10)
42.85
36.66
36
88
31.25
26.66
0
Ceftazidime (30)
0
0
8
0
0
0
0
Cephalothin (30)
0
40.00
0
100
18.75
53.33
0
Chloramphenicol(30) 0
0
0
0
0
0
0
Ciprofloxacin (5)
0
0
0
0
0
0
0
Gentamicin (10)
0
0
0
0
0
0
0
Nalidixic acid (30)
28.57
33.33
56
92
62.50
0
37.5
Nitrofurantoin (100) 0
0
0
0
0
0
0
Streptomycin (10)
26.98
0
0
0
18.75
0
12.5
Sulphafurazole (300) 12.69
0
8
20
0
0
0
Tetracycline (30)
25.39
16.66
0
36
12.50
33.33
25.0
Trimethoprim (5)
14.28
20.00
8
28
0
0
0
2
Discussion
The prevalence and distribution of bacteria belonging
to the genus
Aeromonas
in aquatic environments is of
great public health concern since
Aeromonas
spp. can
cause infections and epizootics in a variety of animals.
Motile aeromonads have been recognized as
occasional pathogens of cultured fishes and the most
common bacteria in freshwater habitats throughout the
world. It is the etiological agent for motile aeromonad
septicaemia (MAS) in fish.
Aeromonas
has also been
frequently isolated from the lesions of epizootic
ulcerative syndrome (EUS) fishes (Torres et al., 1990;
Subasinghe et al., 1990; Roberts et al., 1990). This
disease is a serious threat to the freshwater fish
production of Southeast Asian countries. It causes
mass mortalities in both cultured and wild fish species
every year. The prevalence of different species of
Aeromonas
is likely to vary with geographical
locations. In the present study
Aeromonas sobria
was
the predominant species isolated from fish samples