Map of Ghana showing the Weija Dam and the Tema fishing harbour where fish specimens were collected.

<p>Map of Ghana showing the Weija Dam and the Tema fishing harbour where fish specimens were collected.</p

Human health risk assessment parameters of heavy metals from the consumption of <i>Chrysichthys nigrodigitatus</i> and <i>Brachydeuterus auritus</i> respectively from the fresh and coastal waters of Ghana.

<p>Human health risk assessment parameters of heavy metals from the consumption of <i>Chrysichthys nigrodigitatus</i> and <i>Brachydeuterus auritus</i> respectively from the fresh and coastal waters of Ghana.</p

Trends in the concentration of heavy metals in the muscle tissues of <i>Chrysichthys nigrodigitatus</i> from the Weija Dam of the Densu River in Ghana.

<p>Note: Pb and Cd were below detection limits in C. nigrodigitatus. Note: Concentrations of As and Se, As and Zn, Hg and Se, as well as Hg and Zn were significantly different (Kruskal-Wallis Test with Fisher’s LSD post hoc, H_3,0.05 = 118.779, p < 0.05).</p

Frequency distribution of metal concentrations in the muscle tissues of <i>Chrysichthys nigrodigitatus</i> and <i>Brachydeuterus auritus</i> from the waters of Ghana.

<p>Note: Pb, Cd and Cu were excluded from <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0194682#pone.0194682.g001" target="_blank">Fig 1</a> because Pb and Cd were below detection in all samples while 96% of the C. nigrodigitatus and 100% of the B. auritus samples had Cu levels below detections.</p

Standard length of <i>Chrysichthys nigrodigitatus</i> and <i>Brachydeuterus auritus</i> respectively from the fresh and coastal waters in Ghana.

<p>Standard length of <i>Chrysichthys nigrodigitatus</i> and <i>Brachydeuterus auritus</i> respectively from the fresh and coastal waters in Ghana.</p

Trends in the concentration of heavy metals in the muscle tissues of <i>Brachydeuterus auritus</i> from the coastal waters of Ghana.

<p>Note: Pb, Cd and Cu were below detection limits in B. auritus. Also, pairwise comparison indicates concentration of all metals were significantly different except As and Hg (Kruskal-Wallis test with Fisher’s LSD post hoc, H_3,0.05 = 129.618, p < 0.05.</p

Weight of <i>Chrysichthys nigrodigitatus</i> and <i>Brachydeuterus auritus</i> respectively from the fresh and coastal waters in Ghana.

<p>Weight of <i>Chrysichthys nigrodigitatus</i> and <i>Brachydeuterus auritus</i> respectively from the fresh and coastal waters in Ghana.</p

Comparison of heavy metals concentrations between the muscle tissues of <i>Chrysichthys nigrodigitatus</i> and <i>Brachydeuterus auritus</i> from the waters of Ghana.

<p>Note: <i>Mean ± SD with different letters in columns are significantly different (Mann–Whitney U test</i>, <i>p > 0</i>.<i>05)</i>.</p