Feeding ecology of invasive Perccottus glenii (Perciformes, Odontobutidae) in Slovakia
J. Koščo, P. Manko, D. Miklisová, L. Košuthováhttps://doi.org/10.17221/340-CJASCitation:Koščo J., Manko P., Miklisová D., Košuthová L. (2008): Feeding ecology of invasive Perccottus glenii (Perciformes, Odontobutidae) in Slovakia. Czech J. Anim. Sci., 53: 479-486.
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 firstKeywords:fish; invasion; food; competitions; prey