Istraživanja parazita riba u Bosni i Hercegovini postaju značajna zadnjih godina, s toga su novi nalazi o parazitskim trematodama i njihovim domaćinima važni za bolje razumijevanje parazitologije i patologije riba. U ovoj studiji je uzorkovana 41 jedinka parazita i analizirane su značajne morfološke i taksonomske mjere (duljina i širina tijela, promjer usne i trbušne pijavke, duljina i širina ždrijela, duljina i širina jajnika, duljina i širina sjemenika i duljina i širina jaja). Nakon uzorkovanja paraziti su konzervirani u 70%-tnom etanolu te mjereni uz pomoć Digimizer Image Analyzer Version 4.1 računalnog programa. Nakon svih mjerenja, parazit Azygia robusta je potvrđen po prvi puta na potočnoj pastrvi i taj nalaz je pronađen u rijeci Vrbasu kod Banje Luke, Bosna i Hercegovina (sliv rijeke Save). Raniji nalazi ovog parazita u Europi bili na drugim salmonidnim vrstama kao što je mladica, Hucho hucho. Novi nalaz bi mogao biti značajan podatak o parazitologiji riba u Bosni i Hercegovini.
The investigation of fish parasites in Bosnia and Herzegovina in recent years became significant, and therefore new records of parasitic trematodes and their hosts are important for better understanding of fish parasitology and pathology. In this study 41 parasitic specimens were collected and the basic taxonomical characters were measured (body length and width, diameter of oral and ventral sucker, length and width of pharynx, ovary length and width, testes length and width and eggs length and width). After the sampling of the parasites, they were collected and conserved in 70% ethanol. After that procedure the aforementioned characters were measured using Digimizer Image Analyzer Version 4.1. After all measurements, the trematode parasite Azygia robusta was confirmed for the first time on brown trout Salmo trutta. This first record was found in the Vrbas River near Banja Luka, Bosnia and Herzegovina (Sava River Basin). Former records of this parasite in Europe were observed on other salmonid fish species, as huchen Hucho hucho. This new record should be very important part of data of fish parasitology in Bosnia and Herzegovina.