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Tétel Szabadon hozzáférhető Comparision of growth of mature all-female and mixed-sex Common carp (Cyprinus carpio L.) stocks in RAS(2020-05-20) Kovács, László; Minya, Dániel; Homoki, Dávid; Toviho, Odunayo Abigeal; Molnár, Áron; Fehér, Milán; Stündl, László; Bársony, PéterThe common carp (Cyprinus carpio L.) is the most important fish species in Hungary, it is more than 70% of the total Hungarian fish production. The common carp production is important not only just in Hungary but in Middle-East Europe, as well as Southeast Asia. Majority of the production comes from fishpond culture. If the production sector wants to meet the increasing customer demands, there is need to intensify research on the intensive fish production opportunities for example all-female common carp technologies. The all-female technology is one of a genom-manipulation technology. Its production showed better growth rate than mixed-sex population in pond culture. Our experiment combined the recirculation aquaculture system (RAS) and the all-female common carp stocks intensification technologies. The reason for the experiment, is that there are no result about the growth of all-female common carp growth in RAS. The experiment used the „Tatai grey scale type” common carp stocks. We propagated two all-female stocks (T2 and T3) and a control group (TK). Due to technological characteristics of RAS, the water quality parameters were the same for all treatments and corresponded to the technological tolerance of common carp. The experimental period was from July 10, 2019 – November 20, 2019. Result of growth performance showed that the growth of mixed-sex stock was significantly higher than all-female stocks; (Control=3692.0±590.5g, T2=3438.8±415.4g, T3=3294.1±659.1g). Feed conversation ratio (Control=1.3±0.1 T2=1.5±0.2 T3=1.6±0.5) and SGR% (Control=0.8±0.0 T2=0.7±0.1 T3=0.7±0.1) were similar. By the results it can be said the all-female common carp technology has neither advantages nor disadvantages compared to the mixed-sex stock. The all-female technology can be beneficial if the consumers need female common carps. It is worth continuing the experiment and examine how the stocks will perform above 3kg body weight.Tétel Szabadon hozzáférhető Comparision of growth of mature all-female and mixed-sex Common carp (Cyprinus carpio L.) stocks in RAS(2020) Kovács, László; Minya, Dániel; Homoki, Dávid; Toviho, Odunayo Abigeal; Molnár, Áron; Fehér, Milán; Stündl, László; Bársony, PéterTétel Szabadon hozzáférhető Effect of dissolved oxygen on common carp (Cyprinus carpio) and basil (Ocimum basilicum) in the aquaponics system(2021) Homoki, Dávid; Toviho, Odunayo Abigeal; Minya, Dániel; Kovács, László; Lelesz, Judit Éva; Bársony, Péter; Fehér, Milán; Kövics, György; Stündl, LászlóTétel Szabadon hozzáférhető Effect of Duckweed (Spirodela polyrhiza)-Supplemented Semolina on the Production Parameters and Nutrient Composition of Yellow Mealworm (Tenebrio molitor)(2023) Toviho, Odunayo Abigeal; Moutia, Imane; Pusztahelyi, Tünde; Bársony, PéterTétel Szabadon hozzáférhető Insect base-protein: A new opportunity in animal nutrition(2020) Toviho, Odunayo Abigeal; Bársony, PéterTétel Szabadon hozzáférhető Investigation of the production parameters, nutrient and mineral composition of mealworm (Tenebrio molitor) larvae grown on different substrates(2022) Molnár, Áron; Toviho, Odunayo Abigeal; Fehér, MilánTétel Szabadon hozzáférhető Nutrient Composition and Growth of Yellow Mealworm (Tenebrio molitor) at Different Ages and Stages of the Life Cycle(2022) Toviho, Odunayo Abigeal; Bársony, PéterTétel Szabadon hozzáférhető Optimalization of the European perch (Perca fluviatilis) Digestion and the Utilization of the Yellow mealworm in the Perch NutritionToviho, Odunayo Abigeal; Bársony, Péter; Állattenyésztési tudományok doktori iskola; Debreceni Egyetem::Mezőgazdaság-, Élelmiszertudományi és Környezetgazdálkodási KarThe cost of feeding takes the highest part of aquaculture production cost; protein sources are the most expensive feed ingredient. Insects have been proposed as an alternative protein source and they are especially well suited for carnivore species because European perch already consume more than 50% insects in their natural diet. To develop an effective feed formulation an understanding of the digestive processes is important. The research conducted during this dissertation explored the nutrient composition of yellow mealworm (YM), optimization of production, and nutrient composition of YM and compared the growth, protein efficiency ratio (PER), net protein ratio (NPR), and true digestibility (TD) of diets containing 25% and 50% yellow mealworm meal to soybean meal using a rat assay. We continued to gain a proper understanding of the digestion processes of the European perch, by investigating the enzyme activity at different temperatures lower than the reported optimal. The various experiment provided a basis for the formulation of a diet where various percentages of fishmeal were replaced with yellow mealworm meal, this diet was used in a feeding experiment. We explored the nutrient composition of YM at different ages, sizes, and stages of life cycle. The result shows that larvae do not differ based on age, but the size influences the nutrient composition, the larger-sized worm had lower surface area hence a lower proportion of exoskeleton and higher dry matter content. We also used duckweed as a feeding substrate to determine its effect on production parameters and nutrient composition of YM, the result indicates that above 50% inclusion of duckweed in the feeding substrate result in worse production parameters. When we considered the result of the production parameters and the nutrient composition in this experiment the S75D25 feeding substrate is the best. In an in-vivo rat experiment where soybean meal was replaced with 25% and 50% YM meal the biological values were not statistically different from those fed 100% soybean meal as a protein source. This means that up to 50% replacement of soy with YM meal maintained the quality of protein as seen in the PER, NPR, and TD. The result of enzyme activity at different temperatures shows that the highest enzyme activity is between 18 °C and 20 °C, the enzyme activity peaks at 20 °C after which there is a decline in the enzyme activity. When European perch were fed with feed formulated by replacing 12.5%, 25%, and 37.5% fishmeal with YM meal. The result shows that at all 3-inclusion levels, there is no significant difference in production parameters, hence YM meal can replace fishmeal up to 35.7% without adverse effects on the growth rate, FCR, and survival rate.