Monitoring of the topmouth gudgeon, Pseudorasbora parva (Actinopterygii: Cypriniformes: Cyprinidae) in a small upland Ciemiega River, Poland
2011
Rechulicz, J.,University of Life Science, Lublin (Poland). Dept. of Hydrobiology
The topmouth gudgeon, Pseudorasbora parva (Temminck et Schlegel, 1846) (known also as stone moroko), is an alien species of the fish fauna of many European freshwater ecosystems. In large quantities, its may affect negatively the fish fauna and the functioning of ecosystems. The aim of this study was to find and observe the population of P. parva in a small Ciemiega River (Poland). Abundance, density, length, and mass of the fish from all study sites were analyzed statistically. P. parva was first recorded in the Ciemiega River in the autumn of 2005. The abundance of P. parva in relation to the structure of the local ichthyofauna was the smallest in the spring and the highest in autumn. The total length of P. parva ranged from 15 to 104 mm, and the mass from 0.2 to 10.4 g. Taking into account the number of the specimens, P. parva constituted between 0.9 and 57.2 percentage of the local ichthyofauna. P. parva occurring numerous may be a lot of competition for native fish species, and therefore an important problem is to understand his habitat preferences and interactions with native fish species
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