Katya Velichkova, Ivaylo Sirakov and Stefka StoyanovaDepartment of Biology and Aquaculture, Faculty of Agriculture, Trakia University, Students Campus, 6014 Stara Zagora, Bulgaria
Velichkova, K., Sirakov, I. & Stoyanova, S. (2020) Growth efficiency, biochemical blood parameters and meat quality of rainbow trout (Oncorhynchus mykiss W.), fed with supplement of sweet flag extract (Acorus calamus L.). Bulg. J. Agric. Sci., 26 (Suppl. 1), 180-185
Different plants and their parts can be used as a supplement in food for human and animal. The purpose of this study is to establish the growth rate, meat quality and biochemical blood parameters (glucose, urea, creatinine, total protein, albumin, ASAT, ALAT, Ca, P, Mg, triglycerides, cholesterol) of rainbow trout (Oncorhynchus mykiss), fed with sweet flag extract (Acorus calamus). The fish from the control group C (without supplement) and the experimental A.c (supplemented with 1% Acorus calamus extract), each with two repetitions, were placed in a recirculating system at the Aquaculture Base of the Faculty of Agriculture of the Trakia University. Thirty specimens of rainbow trout with average fish weight of 42.55±7.48g (C) and 45.01±8.94g (A.c) in good health were placed in each tank and cultivated for 60 days. At the end of the experiment, average final weight, specific growth rates, feed conversion factor, meat quality and blood parameters were established. At the end of the experiment, the average live weight of fish fed with sweet flag extract was 6.53% higher than the value of the same indicator of the trout in the control group (P <0.05). The calcium, phosphorus and magnesium levels in the blood of rainbow trout from the experimental group were 71.2%, 37.36% and 37.5% higher respectively than the levels of the same minerals in the control group (P< 0.05). Fish fed with sweet flag extract supplement have better growth rate and lower feed conversion ratio.