Ecological conditions and phenotypic characteristics of Austropotamobius torrentium (Schrank, 1803) in the Subotica and Toplik Rivers

Austropotamobius torrentium (Schrank, 1803) lives in two watercourses, namely Subotica (Sana) and Toplik (Tilava). The influence of the ecological conditions these rivers on individuals this species is analyzed based 22 morphometric parameters. assessment abiotic was done through measurement physical chemical water parameters analysis composition phytobenthos macrozoobenthos. Sampling carried out June, September, October 2021. Water quality at investigated localities (on basis biotic parameters) oligo to betamesosaprobic. A total 37 crayfish were (20 from 17 Toplik). Female have shown significant differences head width (HEW) abdominal thickness (ABH). Males differed significantly a number parameters, including weight (W), shape (HEL HEW), rostrum length (ROL), carapace (CPW), (ABH ABL). Higher values indicated been found males River. obtained results are influenced by different their habitats. River larger watercourse lowland belt with large microhabitats, small river mountain belt, uniform sediment niches species. general both watercourses also affected aquaculture facilities, where wastewater has direct distribution Rivers. For more detailed complete data, it necessary analyze populations, include additional morphometric-meristic molecular-genetic analyses.