Level of heavy

Metal	Muscle	Head	Eye	Gill	Bone	Overall mean
Cr	0.36^c	0.23^d	0.37^ab	0.37^bc	0.37^a	0.34
Cd	0.31^b	0.28^d	0.30^c	0.32^a	0.32^b	0.32
Pb	0.07^c	0.16^a	0.01^d	0.12^b	0.11^b	0.09
Cu	BDL	BDL	BDL	0.62^a	0.59^a	0.24
Zn	0.36^d	0.38^c	0.39^b	0.42^a	0.38^b	0.39
Ni	BDL	0.01^c	0.04^c	BDL	0.01^c	0.01

Data are mean of replicate (2) determinations. BDL: Below instrument detection limit. Letters a, b, bc, and c show differences among the different tissues. Data shown with different letters are statistically different at P< 0.05 level.

Table 4e: Level of heavy metal in Plectorhynchus mediterraneus organs (mg/kg).