Health Risk Assessment and Levels of Heavy Metals in Farmed Nile Tilapia (Oreochromis niloticus) from the Volta Basin of Ghana

Table 2

Levels of heavy metals concentrations (mg/kg) in caged tilapia from fish farms.

	Fish farm A		Fish farm B		Fish farm C		Controls
Metals	Mean  SD	Range	Mean  SD	Range	Mean  SD	Range	Mean  SD	Range
Zn	2.07  0.140	1.80–2.28	2.13  0.33	1.92–2.80	1.82  0.29	1.80–2.28	0.97  0.20	0.58–1.11
Fe	37. 10.84	21.60–54.80	50.11  10.22	38.92–62.6	39.58  9.14	21.6–54.80	11.09  2.03	8.21–14.21
Mn	2.03	1.64–8.80	1.76  0.69	1.04–3.08	2.46  0.60	1.64–8.80	0.77  0.15	0.52–0.96
Ni	1.62  0.03	1.58–1.64	2.74  1.87	0.03–5.04	2.00  0.14	1.58–1.64	0.65  0.11	0.52–0.81
Cr	0.31  0.07	0.20–4.00	—	—	0.33  0.07	0.20–0.40	0.10  0.02	0.07–0.12
As	—	—	—	—	—	—	0.23  0.07	0.15–0.32