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¹ University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Institute of Aquaculture, Husova trida 458/102, 370 05 Ceske Budejovice, Czech Republic
² University of South Bohemia, Faculty of Economics, Studentska 13, 370 05 Ceske Budejovice , Czech Republic
³ The Czech Fish Farmers Association, Prazska 495/58, 371 38, Ceske Budejovice, Czech Republic DOI : 10.4194/1303-2712-v14_1_16 Viewed : 4686 - Downloaded : 4845 The effect of supplemental feeding with modified cereals (pressed triticale, barley, rye and pressed wheat in combination with rape) on the growth of common carp was studied under semi-intensive pond farming conditions. Nonpressed triticale, barley and rye were used for comparison. Two groups were selected as a control dependent only on natural zooplankton. For the evaluation, we employed five models designated M1 – linear mixed models with a random intercept; M2 – linear mixed models with a random slope; M3 – a linear mixed model with a random intercept and slope; M4 – written as model M3 with a power variance function, where the error variance was modelled and M5 – written as model M4 with a power variance function, with a different model of error variance. Model M5 took heterogeneous errors with respect to differing strata. Common carp that were fed supplements of modified cereals showed a significant lower variability of weight (lower SD and narrower 95% CI) compared to the non-pressed diets and pressed barley and rye that yielded higher production. These results suggest that pressed cereals increase yield in commercial production of common carp under semiintensive conditions. Keywords : Cyprinus carpio, growth models, pressed cereals, semi-intensive carp farming, variability of weight