Artykuły naukowe (WNoŻiR)

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https://oa.zut.edu.pl/handle/20.500.12539/81

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Przeglądaj Artykuły naukowe (WNoŻiR) wg Autor "Dąbrowski, Jarosław"

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  • Miniatura
    PozycjaOpen Access
    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.
  • Miniatura
    PozycjaOpen Access
    Piaractus brachypomus (characiformes, serrasalmidae) – an incidental alien species in polish and world waters?
    (Wydawnictwo Uczelniane Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2016) Więcaszek, Beata; Keszka, Sławomir; Dziaman, Robert; Górecka, Klaudia; Dąbrowski, Jarosław; Department of Hydrobiology, Ichthyology and Biotechnology of Breeding, West Pomeranian University of Technology, Szczecin; Department of Aquaculture, West Pomeranian University of Technology, Szczecin; Department of Aquaculture, West Pomeranian University of Technology, Szczecin; Department of Hydrobiology, Ichthyology and Biotechnology of Breeding, West Pomeranian University of Technology, Szczecin; Department of Hydrobiology, Ichthyology and Biotechnology of Breeding, West Pomeranian University of Technology, Szczecin
    This paper presents the biological characteristics of five individuals of Piaractus brachypomus (15.3–37.0 cm TL) caught in north-western Poland (Szczecin Lagoon, lake Dąbie and Pomorzany Power Plant cooling water canal in Szczecin), in 2002–2010, by recreational anglers and commercial fishermen. Additionally, well documented records of P. brachypomus (17.0–49.0 cm TL) in different waters (lakes, ponds, dam reservoirs, rivers and lagoons) collected from 2001 to September 2015 by recreational fishers, are presented. All these individuals were released into the wild by aquarists. Nonindigenous occurrences in Europe and in the world outside the native range (the Amazon and Orinoco basins) of the species are also discussed, including a record of alive pirapitinga in the Baltic Sea. An evaluation of invasion risk in the environment in Poland, based on the thermal tolerance of the specimens studied, is included. The laboratory experiment showed that the lower limit of thermal tolerance was 11.2oC, therefore the potential for over winter survival in Polish waters is extremely low, even in the warm-water canals of power plants. However, the progressive process of global warming may enlarge the distribution of nonindigenous occurrences of P. brachypomus, with more effective overwintering and breeding, with the possibility of novel pathogen transfer to native aquatic biota.