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The influence of origin in intensively bred European perch (\kur{Perca fluviatilis}) on mass yield, chemical composition and organoleptic properties of its meat
FLOKOVIČ, Ondřej
A breeding of seven European perch (Perca fluviatilis) groups of various origin was carried out under experimental conditions at 20°C temperature since the hatching of larval fish up till the age of 278 days, with intensive feeding using BioMar Inicio plus 0,55mm fodder with 15% fat content and BioMar Inicio plus 0,1mm fodder with 18% of fat content in later initial feeding. The average final weight of fish in the individual groups ranged between 79,4g and 27,63g. Mass yield statement (mass fraction of skinless filets, on the total mass), basic chemical analysis of filets (dry matter, crude protein, lipids and ash content) and organoleptic evaluation of musculature quality were carried out in the final stage of the growth test. No influence of the fish origin on the mass yield was detected. The average values ranged between 35,41% and 32,21%, but an influence of origin on crude protein content was discovered. The lowest values were determined in the population from the north of Germany 77,5% and the highest values on the contrary were determined in the population from the Štrbské Pleso lake 80,35%. The lowest lipids content was determined again in the population from the north of Germany 7,14%, while the highest fat content was detected in the population from Slovakia 8,66%. The results of organoleptic analysis didn't show substantial differences. Overall it can be stated that the monitoring didn't prove any substantial influences of fish origin on the parameters observed, which is confirmed by results of similar observations carried out by other authors e.g. with trout and carp.
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Conditional indicator in breeding market carp in semi-operation experiments in fish-ponds in Třeboň
FLOKOVIČ, Ondřej
In my bachelor thesis, I dealt with supplementary feeding of common carp (Cyprinus carpio, L.) in semi-operation experiments in fish-ponds in Třeboň. For the experiment, three-year carp of the operation line scaly Třeboň carp was used. The main objective of the experiment realized by me was to compare the feed triticale in various modified forms. For extra feeding, the feed triticale was used in three modified forms (whole triticale, pressed triticale, whole triticale thermally processed at 100°C). The feeding study was realized for the assessment of conditional indicators of market carp. For the experiment, which lasted 83 days, four fish-ponds were used. 363 pieces were set per hectare of fish-pond. In the fish-pond No. 1, whole triticale was used for supplementary feeding. In the fish-pond No. 2 pressed triticale was used for supplementary feeding. In the fish-pond No. 3, whole triticale thermally processed at 100°C was used for supplementary feeding. The fish-pond No. 4 was used for control without supplementary feeding. During the experiment, control fishing was performed to measure body length, body circumference, body weight and measure fat in the fish muscle. There was a considerable difference in the final weight between the feed whole triticale thermally processed at 100°C in comparison with the control group without supplementary feeding. It was the biggest gain from all tested feed types and reached 12.061 kg. The results of all tested feed types were best for the feed whole triticale thermally processed at 100°C, which proved to be the most suitable.
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