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Vliv hustoty obsádek sumečka afrického (Clarias gariepinus) na efektivitu jeho intenzivního chovu v recirkulačním akvakulturním systému
TRNKA, Kamil
This study is a dressing the breeding process of the african catfish kept in RAS recycling waste heat from the biogas plant. The weight, SGR, FCR, FC, survival rate and were evaluated. During the first test different breeding densities were established (30, 60, 90, 120 kg.m-3) and fishes were kept in the tanks without lowering the the density to the original. Into the tanks with the same quality of the water, we introduced juveniles of the african catfish. Results of the first test showed that the best growth of the african catfish is achieved in the breeding density up to 230 kg.m-3. In the second experiment, the different breeding densities were established (90, 120, 150 a 180 kg.m-3). These densities were periodically lowered to the starting density each Month. In this test we achieved higher SGR and lower FCR. There were no significant differences among the density's groups. Third test was based on the presence of the sorting of the fish in tanks. While not sorting negative influence has appeared. In the non-sorted group, we found couple of marked-sized fish and couple of bellow average fish. Also, the growth parameters showed better results in the sorted group. All experiments showed that the best breeding density is from 180 up to 230 kg.m-3.
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Využití samokrmítkových systémů pro okounovité ryby
HOMOLA, Ondřej
This diploma thesis researched the use of self-feeding systems in intensive aquaculture of pikeperch and perch, serving to optimize the production of these fish species. In the experiment with the pikeperch, there was studied the effect of the various types of feeding methods including self-feeders on the production indicators and feeding behavior. In the experiment with the perch, there was studied the influence of the stocking density on the production indicators and feeding behavior using self-feeding.
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Transfer of juvenile pikeperch (Sander lucioperca L.) from the pond keeping to the controlled conditions of intensive farming
HAJÍČEK, Jiří
Zander (Sander lucioperca) is a species whose importance is growing in European aquaculture. At present there are a number of studies underway to examine the feasibility of removing zander from their natural environment and breeding them intensively in aquacultures. Our study involved placing juvenile zander into aquacultures. Our objective was to determine whether the quantity and density of fingerlings placed in the aquaculture has a bearing on their survival rate.We placed 810,000 follicular fingerlings into a 2.75ha pond. We then dredged 83,000 rapid fingerlings. The survival rate of the dredged fingerlings was 10.25%. The foster period was 48 days. We then divided the juvenile fish into two groups: Group A: larger fish with an average length of 70.47mm ? 6.04mm and average weight of 3.36g ? 0.65g Group B: smaller fish with an average length of 47.03mm ? 3.75mm and average weight 0.66g ? 0.81g. The fish were fed using the "co-feeding" method (Chyromosus plumosus) with the addition of granular fodder. The influence of quantity and density of the fingerlings on their survival rate and likelihood of cannibalism. In each annual season we examined the effectiveness of raising juvenile zander in a recirculating system using a FROV-JU device. We monitored the survival rate of bred fish and their growth and feeding ratio during fostering.
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