This paper presents aquatic macroinvertebrate community composition at six investigated localities of Drina River. Sampling was performed during 2004. Field data together with characteristics of the community were used to estimate the status of the river. According to our results good water quality, within the limits of the 2nd category, was evaluated for Drina River.

The paper presents the results of preliminary study of the intestinal content in bream (Abramis brama L. 1758) of the Danube River through the Belgrade Region. The fishes were collected in May and October during the period 2007-2009 at two sampling sites along the course. A total of 42 fish specimens of different age (2+ to 6+) were examined. By examination of compositing of intestine of bream have been found members from macrozoobentho-groups – Oligochaeta, Gastropoda (Lithoglyphus naticoides), Bivalvia, Amphipoda (Gamaridae). Our investigation showed that the diet of bream is dependent of bottom fauna composition and structure.

Physico-chemical and microbiological analysis of Brvenica River water was conducted in period 2006-2010 and showed seasonal variations of water quality. The results of correspondence analysis indicated that the year 2006 regarding the physical and chemical characteristics of water, was different from the rest of the examined period. This year was characterized by the absence of ammonia, low contents of nitrite, iron and chlorine, and increased concentrations of KMnO4 consumption. In 2007 and 2008 presence of manganese in water, low concentration of KMnO4 consumption was detected as well increased turbidity and electrical conductivity. And the third distinguish period are years 2009 and 2010 when water was characterized by low concentration of NO3, and the presence of ammonia, NO2, and iron in the water, while turbidity was low and conductivity was average. In Brvenica River water Escherichia coli, Citrobacter sp., Enterococcus sp., Klebsiella sp. are detected. In year 2006 number of aerobic bacteria and total coliforms were rather low, while their number in 2008 is relatively high. Over the whole period, only in 2008 fecal streptococci were not detected. Other years are characterized by growth of aerobic bacteria and total coliforms and the occasional presence of fecal streptococci. Throughout the whole examination period fecal coliform bacteria were present in the water.

Land reclamation activity, such as irrigation, requires monitoring in order to create conditions for a stable and highly productive crop production. It is necessary to monitor the use of water for irrigation in order to prevent or mitigate the consequences of unfavorable, poor quality water on soil irrigation, cultivated crops or equipment. In the province of Vojvodina, the Detailed Channel Network has a great potential. The specificities of this source of water for irrigation need to be observed in the usability of water. In 2010 the sampling was conducted in selected localities in middle Backa and Banat. The results indicate that water quality does not always meet the requirements proposed by the applied classification. What is particularly unfavorable is the fact that the worst quality was registered during the survey conducted at the beginning of the irrigation season on all sites.

Research macroinvertebrates in the lower reaches of the River Veternica was conducted during 2008 in spring and summer season on nine sites, in period of reduced outflow of water from the Lake Barje, when the water level is often reduced to the biological minimum. The presence of 91 taxa from 13 groups of macrozoobenthos was detected. Groups of Diptera, Ephemeroptera and Trichoptera were presented with 18, while Megaloptera, Plesoptera and Nematomorpha with one taxon each. The spring has been allocated 69 and 70 taxa in summer. The average was separated 17 taxa. Average number of macrozoobenthos was 1440 ind/square m per site. The few types of macroinvertebrates were very abundant at the site before the river confluence into the South Morava River. Insects made up 66.4% of the total number of individuals, especially the numerous groups of Diptera with 45.7%, while the share of the group Aquatic amounted 31%. The largest shares of the total abundance of taxa were as follows: Chironomus thumma with 28.16%, Limnedrilus hoffmeisteri with 11.2% and Tubifex tubifex with 6.89% and Caenis macrura from 5.2%. The structural parameters indicate that diversity of macrozoobenthos reduces in downstream direction, reflecting degradation of ecosystems.

Since the year 2004 the water reservoir Kraljevac has been recognized as a Special nature reserve. Investigations of the water reservoir were done during the autumn (November) of 2009 at three localities. on the basis of the results obtained in this study Kraljevac reservoir water is moderately polluted and correspond to classes 2nd and 2nd-3rd based on physical, chemical, microbiological and hydrobiological parameters.

The paper presents results of microbiological quality of three drinking water sources – Ratno ostrvo, Petrovaradinska ada and Strand. The following analyses were carried out in 2010: total count of aerobic mesophilic bacteria at 37 deg C, count of organotrophs (categorization according to Kohl), aerobic facultative organotrophs, lipolytic and hydrocarbon oxidizing bacteria. Organotrophic count was determined on low nutritive R2A medium. Enzymatic activity of water was also determined and water was categorized according to index of phosphatase activity (IFA).

Concentration of lead (Pb), lame (Cr), copper (Cu) and cadmium (Cd) were detrmined in Cystoseira algae collected from the Montenegrin mediolittoroal, during the spring 2007. Samples of three species of Cystoseira algae (C. amentacea, C. barbata and C. compressa) were analyzed in order to have information on bioaccumulation of these elements and possibility to use these algae as biomonitors for heavy metal pollution. The data obtained for heavy metals were similar with other area of Mediterranean Sea, with exception for significantly higher concentration of copper, on Budva location.

The study aims to examine source apportionment of heavy metals of the surface sediments in the less than 63 micro m size fraction. An assessment of metals marine pollution was done in the sediment collected from ten locations along Montenegrin coast. The samples were dried and acid-digested and the metal contents (Fe, Mn, Cu, Zn, Cr, Co, Ni) were determined using a flame atomic absorption spectrometry. The results were compared with the literature data from Mediterranean countries.

This paper presents results of wastewater examination from Belgrade sewerage system (BKS) which are discharged into the river Sava (Fair) and river Danube (Visnjica). Examinations were conducted within the project Eight monitoring spots and are compliant with European Directives concerning wastewater management. Project Eight monitoring spots consist of: continuous measurements of physical and chemical parameters (pH, temperature, redox potential and conductivity), sampling of wastewater during 24 hours, measuring flow rate and analyzing the quality of wastewater from monitoring places located at the discharges into rivers Sava and Danube. This paper shows examination results collected at two discharge points out of eight which are included in this project. The analysis of the quality and the quantity of wastewater sampled continuously during 24 hours, the effects of industrial pollution on them and total pollution load from these two collectors on the recipient is given.