Impact of the Fish Cage Aquaculture on the Zooplankton Community in „Kardzhali“ Dam Lake, Bulgaria

D. TERZIYSKI1, V. TZAVKOVA2, R. KALCHEV2 and I. ILIEV3
1 Institute of Fisheries and Aquaculture, BG – 4000 Plovdiv, Bulgaria
2 Institute of Biodiversity and Ecosystem Research, BAS, BG – 1000 Sofia, Bulgaria
3 Plovdiv University „Paisii Hilendarski“, BG – 4000 Plovdiv, Bulgaria

Abstract

TERZIYSKI, D., V. TZAVKOVA, R. KALCHEV and I. ILIEV, 2015. Impact of the fish cage aquaculture on the zooplankton community in „Kardzhali“ Dam Lake, Bulgaria. Bulg. J. Agric. Sci., Supplement 1, 21: 45–55

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.

Key words: zooplankton, dam, trophic status

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