Concentrations (µg/g)    
LIVER GILLS STOMACH FLESH
o, p'-DDE 2.73a ± 0.34 1.74b ± 0.14 1.01c ± 0 .12 0.65d ± 0.04
p,p’-DDD  3.12a ± 0.06 2.04b ± 0.02 1.93c ± 0.11 1.22d ± 0.01
o,p’-DDD  1.65a ± 0.03 1.43b ± 0.11 0.76a ± 0.04 0.55d ± 0.01
p,p’-DDT 0.98a ± 0.12 0.67a ± 0.05 0.53c ± 0.03 0.33d ± 0.01
Alpha BHC 4.21a ± 0.23 2.65b ± 0.11 1.85c ± 0.06 1.23a ± 0.25
Gamma BHC 4.67a ± 0.22 3.57b ± 0.17 2.74c ± 0.06 1.98d ± 0.13
Metoxichlor 0.65a ± 0.05 0.34b ± 0.01 0.28c ± 0.02 0.23d ± 0.01
Lindane 2.85a ± 0.15 1.83b ± 0.05 1.42c ± 0.12 0.86d ± 0.03
Endosulfan 5.64a ± 0.22 3.21b ± 0.31 2.94c ± 0.15 1.75d ± 0.11
Aldrin 1.23a ± 0.04 0.87b ± 0.07 0.54c ± 0.08 0.22d ± 0.01
Dieldrin 4.65a ± 0.45 4.11a ± 0.26 3.86c ± 0.24 2.88d ± 0.15
Within rows mean and standard deviation with difference letters are statistically significant, P<0.0.
Table 1: Mean Concentrations of Some Organochlorine Pesticide Residues in different organs of Tilapia zilli from Alau Dam.