Effect of nutmeg extract supplementation on some productive traits and economic efficiency of common carp (Cyprinus carpio L.) cultivated in recirculation system

Zhelyazkov*, S. Stoyanova, I. Sirakov, K. Velichkova, Y. Staykov   Department of Biology and Aquaculture, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria (Manuscript received 21 December 2017; accepted for publication 16 February 2018)   Abstract. The aim o
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