Growing number of population require growing demand for water. In Sremska Mitrovica area geohydrology conditions of neogen sequence have properties of good collector for groundwater. Geological factors are such that atresian groundwater in Sremska Mitrovica area are divided in four hydrogeological zones. In all zones physical and chemical characteristics of groundwater comply with conditions for water supply.

Research of the seasonal dynamics of the zooplankton abundance was carried out during the two-year period from January 2005 to December 2006. The sampling took place in monthly intervals from five different sites from the surface to the bottom of the lake. Taking into concidertion the temperature and oxygen regime the division on the epilimnion and hipolimnion was found out. Significant numerous in the total abundance of the zooplankton accomplish taxa Daphnia sp., Bosmina sp. and Cyclops sp. Zooplankton is more abundant in the epilimnium, in the layer with more favourable temperature and oxygen regime comparing with hipolimnium. Presence of the zooplankton has been recorded in the lack of the oxygen in hipolimnium during summer months. After the elimination following the heavy rains, the hasty increase of the zooplankton numerous was recorded. Abundance of the zooplankton was higher was in shallow parts of the lake in the area of the mouth comparing the sites close the dam. This research has shown that the zooplankton was present in all parts of the lake during entire year, especially in the epilimnion that characterizes with the favourable temperature and oxygen conditions.

The paper presents the results of aquatic macroinvertebrates community analyses of the Moravica river with the aim to evaluate saprobiological status. Sampling were carried out tree localities during 2003 and 2004.

The objective of the paper is establishing of eco-chemical characterization of the river system by investigating and distribution heavy metal content in the river sediments using sequential extraction and total digestion. Heavy metals toxicity and bioavailability in the Danube river sediment are defined according to their distribution between different phases. Sediments samples were taken from 9 sites and analysed for cadmium (Cd), iron (Fe), manganese (Mn), lead (Pb), copper (Cu), zinc (Zn) and chromium (Cr), and the results about cadmium and iron presented in this paper.

The Water Book maintenance is obligated. The electronic form of Water Book and following documents provides an insight into data from issued water acts, in a simple, systematic and arranged way, which enables easy and fast search, according to assigned key, of data extraction and report printing. Program package is provided by Republic Directorate for Water. The implementation of Water Book program is realised in the Ministry of Agriculture, Forestry and Water Management of the Republic of Serbia - Republic Directorate for Water. Public water enterprises and communities that have technical capacities for program installation.

In this study possibilities for application of natural aluminosilicates, zeolites in the wastewater treatement has been investigated. Under the laboratory conditions the pilot experimental a column filled with aluminosilicates was established. Technological characteristics of the system were estimated by wastewater flow monitoring and calculation of Darcy filtration coefficient.

This study investigates the possibilities of using Lagenaria vulgaris biomass as a biosorbent for removal of heavy metals from wastewater and natural water. The experiments were carried out with model solutions of Pb2+, Cd2+, and Zn2+, in batch system. The effects of contact time, temperature, initial metal concentration and adsorbent doses, on the adsorption of heavy metals have been studied. Results show that biosorbent based on Lagenaria vulgaris represent efficient and low-cost means for pretreatment of heavy metals contaminated waters.

In the beginning of 2008, on the Montenegrin coast is confirmed finding of new species, what was unknown until now in this part of Adriatic sea. The Sphoeroides cutaneus is tropical species with habitat in warm sea around Japan, China and Indonesia. Probably is one of the Lessepsian migrant. It tooks around 130 years for a fish to come through Suez Canal and Red Sea to Mediterranean, then through Otrant Strait into Adriatic sea. It is possible, also that this apparition has something with the global climate change and temperature rise in saltwater in Mediterranean as well as in Adriatic.