Affiliation:
1. Pokeno, Auckland 2471, New Zealand
2. Iraq Natural History Research Centre and Museum , University of Baghdad , Baghdad , Iraq
3. University of South Bohemia , Faculty of Agriculture, Department of Animal Science , Èeské Budìjovice , Czech Republic
Abstract
Abstract
The relationship between pollution levels in river sediment and fluctuating asymmetry of resident silurid fish species, Silurus triostegus Heckel, was assessed. Eight bilateral body proportions were analyzed in 1,500 fish from eight river locations. Sediment pollution was measured based on the analysis of heavy metals (Cd, Cr, Cu, Ni, Pb and Zn) and organochlorine pesticides (DDT, DDD, DDE, chlordane, dieldrin, and lindane). The mean quotient approach (mERMq) was used to characterize sediment toxicity, which ranged from low to moderate levels for heavy metals and from low to severe for organochlorides. Variation was noted in the measurements of fish body morphometrics among the sampling locations, which suggested responses to local environments. Levels of asymmetry were positively correlated with both organochlorine pesticides and heavy metals across locations. These results suggest that fish asymmetry variations could be useful for estimating stress caused by organic toxicity based on the mERMq approach.
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