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    Analysis of Fish Species Composition in Miazga – A Stream Blocked with a Small Dam Reservoir (Pilica River Basin, Central Poland)
    (Wydawnictwo Uczelniane Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2018) Dąbrowski, Jarosław; Więcaszek, Beata; Department of Hydrobiology, Ichthyology and Biotechnology of Breeding, West Pomeranian University of Technology, Szczecin, Poland; Department of Ecology and Vertebrate Zoology, University of Lodz, Poland
    A study of fish species composition was performed in the stream Miazga, blocked with a dam without a fish ladder, located in the Pilica river basin. Three sites above and two below the reservoir were selected. The presence of 13 species of fish and one species of lamprey in larval stage was found. The most abundant species were perch Perca fluviatilis, gudgeon Gobio gobio and Prussian carp Carassius gibelio. The presence of three new species of fish was noted: common brown bullhead Ameiurus nebulosus, eel Anguilla anguilla and orfe Leuciscus idus. The analysis of species evenness indicated that the number of species and their abundance at all research sites were close to maximum. Relatively low value of the dominance index indicated that the examined fish assemblages were not strongly dominated by a single species, which was confirmed by the diversity index. The differences in the composition of the fish fauna at sites above and below the dam reservoir were not sufficiently pronounced in the cluster analysis, however from the historical point of view, the structure of fish assemblage in the stream has changed. Shift in the fish assemblage composition may be affected to the pollution of the stream, stocking activities and escaping from the fish farms.