Abstract
In 1999–2003, investigations of the fish fauna were carried out in selected rivers of the Mazovian Lowland. Electrofishing was used to investigate species diversity and abundance at 35 sampling sites. In total, 8618 fish representing 29 species were caught, weighing in total 77.9 kg. 13 to 22 species of fish and lamprey were registered. The highest number of species was identified in the Świder River (22), dominated in abundance by roach (35.1%) and stone loach (34.9%), and in the Rządza River (20), dominated by gudgeon (33.4) and roach (24.9%). Ten-spined stickleback dominated in the Dluga River (45.5%), roach in the Klusowka river (27.0%), and gudgeon (48.4%) and sunbleak (30.0%) in the Utrata River. 9 reophilic species were identified in particular rivers, accounting for 8.6% to61.0% of total abundance. The abundance of pike, the major predator of small lowland rivers accounted for 0.1% in the Utrata River to 1.3% in the Rządza River. The highest abundance of fish in terms of numbers and the biomass per 1 km of river course were found in the Klusowka River and the Dluga River.
Highlights
Studies of the fish fauna of the Mazovian river have been carried out in the Jeziorka River, which flows into the Vistula River near Wilanów and the Czarna Struga River, the tributary of the Dluga River in the Narew River basin (Rembiszewski 1964), the Bzura River and its right tributary the Utrata River, the Wkra River, which flows into the Narew River below the Dębe dam, left tributaries of the Narew River, some of which are located in the Mazovian region, as well as the Pilica basin (Penczak 1968, Zalewski & Penczak 1981, Penczak et al 1991, 1995, 2001)
The Liwiec River, left tributary of the Bug River in the eastern part of the Mazovian voivodeship was investigated within the boundaries of two macroregions: the South Podlasie Lowland and the Central Mazovian Lowland as well as the Skrwa River (Marszal et al 2004, 2006)
Catches were conducted in the following rivers: the Dluga River, the Klusówka River, the Utrata River, the Świder River and the Rządza River
Summary
Irena Borzęcka *, Paweł Buras *, Jacek Szlakowski *, Zbigniew Gasiński ** and Wiesław W iś niewolski *. A bstract: In 1999-2003, investigations o f the fish fauna were carried out in selected rivers o f the Mazovian Lowland. Ten-spined stickleback dominated in the Długa River (45.5%), roach in the Klusówka river (27.0%), and gudgeon (48.4%) and sunbleak (30.0%) in the Utrata River. The abundance o f pike, the major predator o f small lowland rivers accounted for 0.1% in the Utrata River to 1.3% in the Rządza River. The highest abundance o f fish in terms o f numbers and the biomass per 1 km o f river course were found in the Klusówka River and the Długa River. K ey w ords: lowland rivers, dominant species, fish communities, stability o f occurrence
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