Published in Scientific Papers. Series D. Animal Science, Vol. LXIII, Issue 2
Written by Daniel COCAN, Bogdan UDRESCU, George MUNTEAN, Radu CONSTANTINESCU, Paul UIUIU, Alexandru - Sabin NICULA, Arsene Mathieu HOUSSOU, Călin LAŢIU, Vioara MIREŞAN
In the present study we analyzed fish species composition and diversity indices of Iara River (Cluj County). A total number of 189 specimens belonging to 9 species and 4 families were caught, using single pass electrofishing techniques. A total number of 11 sampling sectors were established. Our results were compared to previous studies and show changes in species distribution and diversity indices, due to environmental changes caused by climate changes and anthropic activities. We noticed the absence of the Grayling (Thymallus thymallus) and Stone loach (Barbatula barbatula) mentioned in previous studies, and the first record of Prussian carp (Carassius gibelio) in Iara River catchment. Also, the Caps dam (Iara – Fântânele deviation) blocks the upstream migration of Common bullhead (Cottus gobio). The calculated diversity indices (Shannon H', Simpson 1-D, Margalef Md, Berger-Parker d and Evenness J') show a low species diversity. This is the result of intense anthropic activities such as deforestation, dam construction and habitat fragmentation, even though the upper sector of Iara River is integrated in Natura 2000 protection areas.
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