Organs Sites TBC at 37°C (cfu x104 /g) SFB (cfu /g) Enterobacteriaceae (cfu x 103 /g) E. coli(cfu /g) Salmonella sp. (cfu /g) Shigella sp. (cfux102 /g)
Muscles SI
SII 		17 d
80 cd		 83 c
338 bc		 3 b
4  b		 35 f
419 de		 0 e
17 de		 1 e
5 e
Skin SI
SII 		124 cd
2570 a		 256 c
758 bc		 127 b
128 b		 0 f
2356 b		 12 de
43 c		 46 cd
131 a
Gills SI
SII 		1 d
240 c		 487 bc
2159 ab		 2  b
19 b		 0 f
3218 a		 36 cd
215 a		 19 de
91 b
Liver SI
SII 		2 d
92 cd		 58 c
399 bc		 1 b
7  b		 0 f
759 c		 0 e
29 cd		 11 e
22 de
Gut SI
SII 		32 d
2258 b		 139 c
263 c		 162  b
2309 a		 0 f
471d		 115 b
122 b		 61 bc
77 bc
Gonads SI
SII 		1 d
5 d		 190 c
3401 a		 3  b
4  b		 193 ef
794 c		 0 e
96 b		 9 e
18 de
Site I: before El-sail drain disposal point. Site II: after El-sail drain disposal point. TBC: Total bacteria counts. SFB: Spore-forming bacteria. Means followed by the same letter within the same columns are not significantly different (p ≥ 0.05).
Table 3: Microbial load in various organs of Oreochromis niloticus collected from both studied sites.
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