Previous Rufford Small Grant helped us to establish the presence of striped pijor in certain localities (Dabar field) and provided better insight into its habitat. However, the presence of striped pijor is observed in other streams of karst fields in eastern Herzegovina, so we plan to expand the territory of the research. Recently described new species, Telestes dabar was recognized using morphological comparisons of isolated geographical populations of fishes identified earlier as Telestes metohiensis. A lectotype is designated for T. metohiensis, whose range is shown to include watercourses of Gatačko, Cerničko and Nevesinjsko fields in Eastern Herzegovina (Bogutskaya et al., 2012). In order to resolve taxonomic uncertainties resulted by overlap of morphological variation of these two species, it is necessary to implement molecular based taxonomy (DNA taxonomy). Consequently, clearly identification of species boundary would provide better insight into species range, which is further step for the implementation of the conservation management plan. DNA approach will contribute to establishing the species boundary in taxonomic sense and genetic variation of populations. We will also collect DNA material of invasive species in order to determine their evolutionary potential which is important due to competition with the endemic species for resources.