Javid Imanpour Namin - Faculty of Natural Resources, Guilan University, P. O. Box: ۱۱۴۴, Sowmehsara- Iran
Petr Spurný - Institute of Fisheries and Hydrobiology, Faculty of Agronomy, Mendel University of Agriculture and Forestry, Brno- Czech Republic

Fish and macrozoobenthos of the Be va River were studied in summer and autumn 2000 and 2001. Electric fishing gear (Honda EX 1000, DC 230 V, 0.75-0.9 kW) was used for sampling. Four sampling sites (Grymov 19.6 r.kms, Rybá e 22.2 r.kms, Hustope e 50.7 and Choryn 54.7 r.kms) were selected. Quantitative samples of macrozoobenthos were collected in each site using a modified Surber sampler (box-type, 1400 cm2 coverage area and 150 Micron mesh size). Total of 23 fish species representing 5 families were determined. Family Cyprinidae with 15 species was the dominant and family Salmonidae, Balitoridae, Percidae and Gadidae were other recorded families. Fish species richness ranged from 9 at the Hustope e to 20 at Grymov localities. The lowest fish abundance and biomass was observed at the Hustope e (28.93 kg.ha-1 and 336 fish.ha-1) and the highest at the Choryn site (612.90 kg.ha-1 and 7367 fish.ha-1) respectively. Sum of 50 species of macrozoobenthos were determined in the River. Macrozoobenthos species richness varied from 4- 18. Biomass of macrozoobenthos varied from 0.08 - 11.7 gr.m-2 and abundance from 104- 1649 ind.m-2. Index of fish diversity varied from 0.811- 2.05 and equitability from 0.449 to 0.821 while this index for macrozoobenthos ranged from 1.1- 2.62 and equitability from 0.66- 0.94.saproby index also varied from 1.42 – 2.64 corresponding to -ezosaprobe.

Becva River, Ichthyology, saprobity, macrozoobenthos, Czech Republic