Effect of addition 6% of linseed oil (designated L06), 6% and 10% of fish oil (R06 and R10) to feed on the fatty acid spectrum of common carp (Cyprinus carpio L.) was investigated. The basic feedmixture which was used as a control variant (K – 34% protein; 9% fat) and the three with oil addition (L06, R06 and R10) were fed to carp fingerling (43.25 g average weight) for 60 days – from 23rd April to 20th June. Before that the fish were fed for 2 month by whey grain and commercial feed for carp fingerling in pond fish-culture (KP feed mixture – 33% protein; 5% fat) at daily feeding rate 1.5% of actually fish mass. This procedure was intended to create feeding conditions closest to those witnessed in market fish farmed in ponds during the vegetation season nevertheless the spectrum of fatty acids present in the fish muscle at the experiment’s beginning did not fully correspond to what was observed in carps living in ponds and fed by cereals.An addition of 6% of linseed oil to the feed lowers the content of the oleic acid and MUFA and, at the same time, it boosts the contents of the α-linoleic acid, n-3 PUFA and the general PUFA in the meat of carp fed on mixtures thus enriched. Additions of 6% and 10% of fish oil to the feed for common carp increases the content of the eicosapentaenoic acid. The 10% addition proved beneficial for also the ratio of n-3/n-6 PUFA. The high content of the docosapentaenoic acid and the general PUFA in the meat of fish as early as the beginning of the experiment resulted in a smaller number of significant changes in the spectrum of fatty acids (particularly the docosahexaenoic acid, PUFA and n-3/n-6 PUFA) found in the fish meat of the L06, R06 and R10 experimental variants.

KUKAČKA VLADIMÍR, JIRÁSEK JIŘÍ, KOPP RADOVAN, MAREŠ JAN: The utilization of rapeseed expeller for carp (Cyprinus carpio) diets. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2013, LXI, No. 5, pp. 1289-1295 Production eff ectiveness of rapeseed stamping in the common carp fodder was attested in the controlled conditions of recirculation system with the absence of natural food. 4 isonitrogenous (31.5% NS) and isoenergetic (17.3 MJ GE.kg ) diet with diff erent (35 and 40%) unmodifi ed (URS) and technologically modifi ed (MRS) rapeseed expeller ratio were tested. During the sixty-day feeding trial, benefi cial production eff ect of diet with modifi ed stamping was proved. Diet MRS fi sh were characterized by signifi cantly (P < 0.05) faster length growth. In comparison with fry of MRS variant, they have reached highly signifi cantly (P < 0.01) the higher values of broad -backedness index and signifi cantly (P < 0.05) higher values of body width. Signifi cant values were not detected by individual weight and HSI. Except the haematocrit value, there were no hematologic and biochemical indices infl uenced by feed type. Higher content of fat in the URS was shown at fi sh variant URS/40 by higher fat deposition in hepatopancreas (averagely 30.31%), without statistically signifi cant diff erence compared to other variants. carp fry, growth intensity, feed conversion, haematological parameters Climate changes in the global impact infl uence the sources of basic compound for fi sh feed production -the fi sh-fl our. Also, they infl uence a crop structure of agriculture production with extension of foretime marginally grown crops. Regard to the availability, high consumption and price, there are possibilities of partial reduction of fi sh-fl our in aquafeeds. Namely for the carnivore salmonids and fi sh of prey breeding, the nutrition identifi cation of non-traditional protein sources suitability has prior breeding and economical intent. The development of productively eff ective and aff ordable diet is necessary even for juvenile omnivorous fi sh breeding, including carp. According to TACON and JACKSON (1985), the level of fi sh-fl our substitution in aquafeed depends primarily on the essential fat acids balance and presence of antinutrition substances. In connection with biofuel using program under the EU, the signifi cant growth of oilseed rape (Brasicca napus L.) arisen. Products obtained by industrial manufacturing can be considered as perspective feed ingredients and protein sources for fi sh, as well as the modern technological methods in the processing and the technique of feed production (extrusion).For feeding purposes the oilseed rape is used mainly in extracted grout or stampings. THIELSSEN et al. (2004) added the rape protein concentrate (canola concentrate -CPC) into the feed for rainbow trout (Onchorhynchus mykiss). The best results were reached with 50% presence of CPC in dry matter of feed. The digestibility data of variously processed oilseed rape by see bass carried out i...