This study presents concentrations of iron, manganese, zinc, and copper in selected tissues of two fish species: pike (Esox lucius L.) and bream (Abramis brama L.) living in lakes Ińsko and Wisola, Northwestern Poland. The lakes differ in their trophic status. The effect of gender and environmental conditions on metals accumulation was also investigated. Metal analyses were performed using inductively coupled plasma atomic emission spectroscopy. Considering all studied fish species and tissues, the average metal concentrations (micrograms per gram wet weight) in both lakes occurred in the following ranges: Fe 0.8–240.6, Mn 0.2–8.4, Zn 3.0–185.9, and Cu 0.14–7.76. The lowest levels of the studied metals were always detected in the muscles. The spleen, kidneys, and liver were found to accumulate the highest amounts of Fe. In the case of the other metals, the highest levels were found, as follows: Mn in skin, gills, and gonads, Zn in digestive tract and gills, Cu in liver. Heavy metal content in fish gonads was observed to be sex dependent.

In this study, bioaccumulation of the heavy metals (Hg, Pb, Cd, Cu, Zn, Cr, Ni, Fe, Mn, V, Li, Al) in the shells of Mytilus edulis were investigated. Shells of Mytilus edulis were collected in May to September 2005 from 12 stations on the Polish coast of Baltic Sea. At each sampling sites 17-330 different size of shells were collected during 2005, respectively. Due to heavy industrial activities in the region, the bay has the polluted coastal waters of Poland. Shells were analysed by ICP AES and Coleman MAS 50 CV atomic absorption spectrometer. As expected from the similarity found between the relationships of metal content length and dry the concentrations of the different metals in the shells did not seem to depend on the shell length. No significant differences were detected in metal concentration between different shell lengths. Given their geographical distributions, as well as their abilities to show up spatial and temporal changes in metal bioavailabilities confirmed here, it is concluded that the mussel M. edulis a suitable candidate to be used in biomonitoring surveys of the Poland coast of Baltic.

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Cadmium bioaccumulation 3J1d its effects on the changes of some hematological parameters in carp, Cyprinus carpio L., was studied. Carp was exposed 24 hr to acute concentra tion of cadmium (0.5 mg Cd/dm 3 water) at 27°C. Parti cularly the greatest• acc�mulation of cadmium'. was in gills, kidneys, alimentary canal, hepatopancreas, and with lesser degree in spleen and vertebral column; while in skin and muscles accumulated only low levels of cadmium. Hemato logically, cadmium bioaccumulation significantly rised erythrocytes count, hemoglobin content, hematocrite value and blood glucose, but decreased leukocytes count in comparison to control samples. Histologically, cadmium caused pathological alterations in the gill filaments and respiratory lamellae, hepatopancreas and kidney but did not affecting the skin. In addition, cadmium disturbed the metal contents (Cu, ZN, Fe and Mg) in. organs in which it accumulated.