Heavy metal pollution of aquatic ecosystems is worldwide problem with consequences on the aquatic organisms. The concentrations of selected heavy metals (Fe, Mn, Zn, Cu, Cd and Pb) were determined in liver, kidney, gills, muscle and bone of barbel (Barbus rebeli) and chub (Squalius squalius) from the river Crn Drim in Macedonia. In general, liver and kidney in both fish species contained the highest concentration of the investigated metals, while muscle showed lowest bioaccumulation of heavy metals. Analyses supported significant seasonal differences in some organs for some metals: highest value in spring-summer compared to autumn-winter period. Generally, metal concentration was higher in the barbel than chub. The concentration of metals in muscle are bellow permissible value and do not constitute any threat for human health due to the consumption of metal loaded fish.
In this study, for the first time Length-weight relationship (LWRs) were determined for two fish species: chub Squalius squalus Bonaparte, 1837 and Barbus rebeli Koller, 1926. Fish were collected from the river Crn Drim by electrofishing (Samus 725G) between January 2010 and January 2012.A total 552 specimens were collected. Body weight (W) and total length (L) were measured and weighed and LWRs was estimated as W = a + b•log(L). The estimated b values were 2.877 and 2.994 for S. squalus and B. rebeli, respectively. No previous information is available for LWRs for those two species, not even in FishBase. The obtained data in this study would be useful for the future ichthyological research of these species.
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