NEW DATA ON ICHTHYOFAUNA OF RIVER ČESMA (CENTRAL CROATIA)

U razdoblju od travnja do listopada 2006. provedeno je istraživanje rijeke Česme kako bi se upotpunilo poznavanje faune slatkovodnih riba Bjelovarsko–bilogorske županije. Ustanovljena je prisutnost 25 vrsta riba iz osam porodica. Najbrojnije su porodice Cyprinidae sa 16 vrsta i Percidae s tri, dok je preostalih šest porodica zastupljeno samo sa po jednom vrstom. Prema udjelu u ukupnoj brojnosti najzastupljenije su vrste Gobio obtusirostris (13,8%), Rutilus rutilus (12,4%), Rhodeus amarus (11,8%) i Carassius gibelio (11,3%). U ukupnoj ihtiomasi kudikamo najveći udio ima vrsta Carassius gibelio (49,5%), dok mnogo manji imaju vrste Silurus glanis (6,1%), Squalius cephalus (5,4%), Ameiurus melas (4,7%) i Leuciscus idus (4,1%). Zbog nepostojanja starijih literaturnih nalaza sve su vrste prvi put zabilježene za slijev rijeke Česme, dok su jez (Leuciscus idus) i pijor (Phoxinus phoxinus) novozabilježene vrste i za cijelo područje Bjelovarsko–bilogorske županije.During the period between April and October 2006 we conducted extensive research on ichthyofauna of river Česma in order to extent the knowledge of the freshwater fish fauna of Bjelovar–Bilogora county (central Croatia). We confirmed the presence of 25 fish species sorted in 8 families. Most numerous family was Cyprinidae with 16 species and Percidae with 3, while the remaining 6 families were represented by only one species. According to the proportion in the total individual number, the most abundant were Gobio obtusirostris (13.8%), Rutilus rutilus (12.4%), Rhodeus amarus (11.8%) and Carassius gibelio (11.3%). In the terms of total fish weight (ichthyomass), highest represented was Carassius gibelio (49.5%), followed by Silurus glanis (6.1%), Squalius cephalus (5.4%), Ameiurus melas (4.7%) and Leuciscus idus (4.1%). As there are no previously published data, all 25 species have been recorded for the first time for the river ^esma basin, while Leuciscus idus and Phoxinus phoxinus have also been recorded for the first time in Bjelovar–Bilogora county