Table 2.

Average concentration of heavy metals (Ni, Fe, Zn, Mn, Cr, Pb, Cd) in shrimps collected from six sub-districts of Khulna.

Sub-districts	Concentrations of heavy metals (mg/Kg)
	Ni	Fe	Zn	Mn	Cr	Pb	Cd
Rupsa	BDL1	358.990 ± 52.139	82.280 ± 3.851	17.250 ± 3.397	0.084 ± 0.022	0.691 ± 0.074	0.049 ± 0.001
Phultola	BDL	331.130 ± 57.795	84.103 ± 6.589	26.450 ± 9.295	BDL	0.502 ± 0.036	0.044 ± 0.002
Dacope	BDL	310.910 ± 22.459	73.368 ± 9.976	6.550 ± 2.576	BDL	0.418 ± 0.027	0.041 ± 0.006
Batiaghata	BDL	184.084 ± 32.636	74.864 ± 14.088	37.870 ± 11.247	BDL	0.362 ± 0.022	0.040 ± 0.004
Paikgacha	0.080 ± 0.515	219.888 ± 20.795	80.678 ± 6.443	35.220 ± 11.369	0.235 ± 0.071	0.361 ± 0.019	0.041 ± 0.001
Dumuria	0.042 ± 0.013	211.012 ± 37.813	74.464 ± 4.169	34.780 ± 8.877	BDL	0.354 ± 0.040	0.041 ± 0.003

¹Below detectable level.