STEFKA N. STOYANOVA; YORDAN S. STAYKOV
Trakia University, Department of Biology and Aquaculture, Faculty of Agriculture, BG-6000 Stara Zagora, Bulgaria
Stoyanova, St. N. and Y. S. Staykov, 2017. Effect of stocking density on growth performance, feed conversion and fi sh production of rainbow trout (Oncorhynchus mykiss), cultivated in raceways. Bulg. J. Agric. Sci., 23 (1): 154–158
One of primary factors determining high yields in fi sh farming is the optimum stocking density. The aim of the present study was to establish the effect of stoking density of rainbow trout (Oncorhynchus mykiss), cultivated in raceways on growth performance, feed conversion and fi sh production. For this purpose, 30 000 fi sh were randomly distributed in 6 raceways (5 000 fi sh/raceway). In the beginning of the experiment trouts weighed 21-22 g. Two different stocking densities were investigated – 150 fi sh/m3 (SD1) in control group (C) and 125 fi sh/ m3 (SD2) in experimental group (E). Each group was run in three replications. The experiment’s duration was 60 days. The fi sh of experimental group exhibited better growth performance by 11.46% and higher fi sh production by 12.42%, compared to the control group (р≤0.001).