ICHTHIOFAUNA OF THE RIVER ILOVA IN THE REGION OF UPPER POILOVLJA(CENTRAL CROATIA) | IHTIOFAUNA RIJEKE ILOVE U PODRUČJU GORNJEG POILOVLJA (SREDIŠNJA HRVATSKA)

Investigations on the ichtiofauna of the river Ilova were carried out in the region of upper Poilovlja (Central Croatia). This part of the Ilova River has a typical Cyprinidae water flow. Research was carried out from May until August, 1988. Twenty one species of fish from 6 families were found to be present. The most abundant was from the family Cyprinidae (13 species), while the family percidae was second in place according to the number (4 species). Quantitatively, expressed by the percentage of numbers, the most representative species was the crucian carp Carassius auratus gibalio (36.74%), then the American sheat fish Amiurus nebulosus (12.8%). The greatest ichthiomass had the carp Cyprinus carpio (79.1%), the grass carp Ctonopharyn-godon idella (16.0%), the crucian carp Carassius gibelio (14.40%), etc. Investigations determined a significant presence of alochtonic fish species (Ctenopharyngodon idella, Carassius auratus gibelio, Hypophthalmichthys molitrix, Aristichthys nobilis and Amiurus nebulosus), which is above all explained by the fact that they are in the immediate area of the carp farm »Končanica«.

Istraživanje ihtiofaune rijeke Ilove obavljeno je u području gornjeg Poilovlja (središnja Hrvatska). U tom dijelu Ilova je tipični ciprinidni vodotok.Istraživanje je provedeno u razdoblju od svibnja do kolovoza 1988.Ustanovljena je prisutnost 21 vrste riba iz šest porodica. Najbrojnija je porodica Cyprinidae (13 vrsta), a na drugom je mjestu po brojnosti porodica Percidae (4 vrste).U kvantitativnom pogledu, koji je izražen u postotku brojnosti, najzastupljeniji su babuška, Carassius auratus gibelio (36,74%) i američki somić, Amiurus nebulosus (12,08%).Najveću ihtiomasu imaju šaran, Cyprinus carpio (29,01%), bijeli amur, Ctenopharyngodon idella (16,05%), babuška Carassius auratus gibelio (14,40%) itd.Istraživanje je pokazalo znatnu prisutnost alohtonih ribljih vrsta (Ctenopharyngodon idella, Carassius auratus gibelio, Hypophalmichthys molitrix, Aristichthys nobilis, Amiurus nebulosus), što se prije svega objašnjava činjenicom da su u neposrednoj blizini Šaranskl ribnjaci »Končanica«.