The ichthyofauna of the retention Stara Drava bilje

Na području retencije Stara Drava Bilje Aljmaškog rita napravljeno je četiri uzorkovanja riba u razdoblju od 2011. do 2020. godine s ciljem utvrđivanja prisutnosti slatkovodnih vrsta. Ukupno je utvrđena 21 vrsta riba, 13 autohtonih vrsta te 8 stranih vrsta riba. Najzastupljenija strana vrsta je sivi glavaš (Hypophthalmichthys nobilis) s 39,05 %, potom babuška (Carassius gibelio) s 32,46 % i crni somić (Ameiurus melas) s 20,85 %. Od ciljnih vrsta koje se nalaze na popisu divljih vrsta od interesa za Europsku uniju, jedino je bolen (Leuciscus aspius) potvrđen na lokaciji. Ujedno, nisu potvrđene strogo zaštićene vrste riba. Prema aktualnom crvenom popisu slatkovodnih riba Republike Hrvatske, na lokaciji je utvrđena samo jedna ugrožena vrsta slatkovodnih riba, obični klen (Squalius cephalus). Osim toga, tijekom ihtiološkog istraživanja utvrđeno je pet vrsta u kategoriji najmanje zabrinjavajuće vrste (LC): obična uklija (Alburnus alburnus), bolen (Leuciscus aspius), bodorka (Rutilus rutilus), grgeč (Perca fluviatilis) i smuđ (Sander lucioperca) te jedna nedovoljno poznata vrsta (DD): šaran (Cyprinus carpio).In the area of retention Stara Drava Bilje, four fish samplings were made in the period from 2011 to 2020, with the aim of determining the presence of freshwater species. A total of 21 fish species were determined, 13 native species and 8 alien fish species were identified. The most common alien species was the Bighead carp (Hypophthalmichthys nobilis) with 39.05%, followed by the Crucian carp (Carassius gibelio) with 32.46% and the Black bullhead (Ameiurus melas) with 20.85%. Of the target species on the list of wild species of interest to the European Union, only the Asp (Leuciscus aspius) has been confirmed at the site. At the same time, strictly protected fish species have not been confirmed. According to the current Red list of freshwater fish of the Republic of Croatia, only one endangered species of freshwater fish, the Chub (Squalius cephalus), has been identified at the site. In addition, during ichthyological research, five species were identified in the category of Least Concern species (LC): Bleak (Alburnus alburnus), Asp (Leuciscus aspius), Roach (Rutilus rutilus), Perch (Perca fluviatilis) and Pike-perch (Sander lucioperca), and one species in category Data Deficient (DD): Common carp (Cyprinus carpio)