IMPACT OF THE FISH CAGE AQUACULTURE ON THE ZOOPLANKTON COMMUNITY IN KARDZHALI DAM LAKE, BULGARIA

R. Kalchev, D. Terziyski, I. Iliev, V. Tzavkova

Abstract: Based on complex water body investigations including also studies of zooplankton community the effect of cage fish breeding on zooplankton cenotic indicies of Shanon, Pielu and Simpson in „Kardzhali“ Dam Lake was analyzed. The spatial horizontal distribution of zooplankton biomass and the indicies of species diversity distinguished the zone in proximity of cage facilities as most antropogenically loaded, while the remote aquatic regions showed relatively high species diversity and stability values. Additionally the ratio Cladocera/Copepoda by biomass was calculated and the vertical zooplankton gradient distribution presented.

Keywords: dam; trophic status; zooplankton

Date published: 2017-09-28