Abstrakt

The Effects of Introduction of Pike-perch (Sander Lucioperca Linnaeus, 1758) on Native Species in Hydroaccumulations on the River Neretva

Sanel Ridanovic

Introduction of allochtonous fish species is a form of biological water pollution. These species are biological entities distributed outside the scope of their own natural distribution range. When an introduced fish species successfully adapt to new ecological conditions, they significantly reduce the number of indigenous species. This papers aims to determine impacts that introduction of allochtonous, invasive species Sander lucioperca Linnaeus, 1758 has on native fish species in lakes on the river Neretva. The research was conducted from August 2012 to March 2013. Fieldwork was conducted at three selected sampling sites, Slatina, Ostro�¾ac and Ribi��i. The content of gastrointestinal tract of Sander lucioperca was examined in order to determine its main diet and elucidate whether it preferably feeds on native or other introduced species. The main findings of the study suggest that Sander lucioperca mainly feeds on Alburnus arborella, Bonaparte, 1841, occassionally on Carasius auratus gibelio, Bloch, 1783 and rarely on Gasterosteus aculeatus, Linnaeus, 1758.