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Hodnocení produkční účinnosti krmiv v chovu lososovitých ryb
Arežina, Slaven
This diploma thesis deals with the nutrition and evaluation of salmonid fish species, more precisely Riverine brown trout. In the practical part, I have dealt with two studies, by monitoring the growth of fish from 50 g to market weight and monitoring the growth of fish from 125 g to market weight. In both studies, food that was used to fed was a feed Aller gold 3 mm, Aller gold 4,5 mm and Coppens ultra 4,5 mm. In the first test, I fed fish on an average for 180 days to achieve a market weight of 268,14 g. In second test on an average for 108 days to achieve a market weight of 342,72 g. Furthermore, on these fish were performed partial tests such as the FCR fodder, the specific growth rate of the SGR, fish survival per period, cumulative fish survival, relative fish gain over the reference period, and the relative ratio of FCR/SGR. The system in which the fish were kept was flowing. As a result, the values evaluated by the software differed from the measured values, mainly because the software evaluated the values for all the ponds and only for the whole time of breeding from the input and final data, whereas I evaluated the values only for the individual ponds and the individual stages of the breeding, which take into account interventions in the pond stock. Therefore, all FCR feed rates and survival percentages differ from those measured. Deviations are noticeable in the first test, the "KASA" program evaluated the FCR at an average of 1.31 and my value was 0.93; the survival rate was 63.82% on average, and my score was 88.41%. In the second test, the results differed again for the same reason. The software evaluated the FCR on average at 0.97 and my average score was 0.94; the survival rate for the second test evaluated the program at 102.61% and my score was 97.05%. Comparing the test period, the more favorable results were obtained when using fish with an average weight of 125 g.
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Optimization of harvest of juveniles of pikeperch (\kur{Sander lucioperca}) taken out of ponds and following ability of the fish to adapt to system RAS
HAMPL, Jan
Within my bachelor thesis I have been trying to resolve the possibilities of optimization of harvest of juveniles of pikeperch (Sander lucioperca) taken out of ponds, and continuously I have been tracking the ability of the fish to adapt to system RAS that is applied at the experimental fish culture facilities at FROV JU. Working at the fish harvest it has shown me to be important to synchronize the work of every one of the assistants during the individual activities. The fish have been harvested in a very short time and carefully taken to already prepared transport boxes. We checked the most important parameters for the quality of water, its temperature and oxygen saturation. The mortality of the fish during the harvest and transport did not get over 2 %. Just after the transport to experimental fish culture facilities at FROV JU, to the system RAS at Vodnany, the harvested fish has been placed to 9 tanks for the weaning period. Each out of three ponds always received three tanks of harvested and adapted fish. The experiment at RAS has been divided into three parts. First part has been about the weaning period of the fish to the RAS system and the artificial food. The results were very satisfying. I have been following these parameters: SGR, FCR, increase of biomass, survival and cannibalism at the tanks. The level of survival from the pond Rohlíček has been around 83,6 %, the pond Bejkovna 69,7 % and Horažďovice 4 the level of survival was 71,8 %. After finalizing the weaning period we did biometry for 37 of selected representatives. Second part has been the 1st post-weaning period. Here I focused at the parameters such as SGR, FCR, increase of biomass, survival and cannibalism at the tanks. The level of survival from the pond Rohlíček has been around 84,17 %, the pond Bejkovna 83,83 % and Horažďovice 4 the level of survival was 82,83 %. After finalizing the 1st post-weaning period we did biometry for 37 of selected representatives. Third part has been the 2nd post-weaning period. Here I focused at the same parameters as above such as SGR, FCR, increase of biomass, survival and cannibalism at the tanks. The level of survival from the pond Rohlíček has been around 87,5 %, the pond Bejkovna 88,17 % and Horažďovice 4 the level of survival was 87,17 %. After finalizing the 2nd post-weaning period we did biometry for 37 of selected representatives, the experiment was evaluated and pikeperch juveniles were sold to the French company Asialor.
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