Czech J. Anim. Sci., 2008, 53(11):479-486 | DOI: 10.17221/340-CJAS
Feeding ecology of invasive Perccottus glenii (Perciformes, Odontobutidae) in Slovakia
- 1 Faculty of Human and Natural Sciences, University of Prešov, Prešov, Slovak Republic
- 2 Institute of Zoology of SAS, Košice, Slovak Republic
- 3 Department of Parasitology, University of Veterinary Medicine, Košice, Slovak Republic
Stomach contents of 331 specimens of Perccottus glenii (Perciformes: Odontobutidae) were analysed. Chironomids and ephemeropterans dominated the diet of all size classes of fish; however, the frequency of crustaceans was also high. Micro-crustaceans (ostracods, copepods and cladocerans) dominated in lower size classes (20-39 mm); macro-crustaceans (Isopoda, Amphipoda) dominated in higher size classes (up to 79 mm). The proportion of crustaceans decreased from the size class 80-89 mm. With the increasing size of fish the frequency of molluscs (Gastropoda) increased, the maximum was in size class 70-79 mm. Cannibalism occurred from 60 mm, and it was significant from 80 mm. The highly mobile invertebrates (Coleoptera, Heteroptera) were found in the largest size classes. In middle size classes (40-59 mm), the widest spectrum of prey units was documented; the food variability of small (90 mm) individuals was poor. Differences in the diet composition of small individuals were negligible; the diet of the largest ones differed significantly. According to diet, two feeding size class groups were recognised: the first
Keywords: fish; invasion; food; competitions; prey
Published: November 30, 2008 Show citation
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