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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Interaction of non-native species of crustaceans in Czech waters: Predator or prey?
 ŠVAGROVÁ, Kateřina
This diploma thesis deals with non-native species of crustaceans, which are already present not only in Europe but also successfully inhabit the territory of the Czech Republic. The species that this work deals with is the signal crayfish (Pacifastacus leniusculus), marbled crayfish (Procambarus fallax f. virginalis) and the killer shrimp (Dikerogammarus villosus). The main goal of this study was to demonstrate the ability of killer shrimp to attack and prey on the crayfish eggs and hatchlings of above mentioned species, which were used not only for theuir presencein Czech Republic but also as model representatives of families Astacidae and Cambaridae. It was therefore the confirmation of high aggressiveness of killer shrimp and point out, that this species is capable of negatively influencing even the bigger invertebrates by direct predation on their early developmental stages. Another aim was to assess whether the killer shrimp can be a suitable prey for a crayfish. As the experiments have shown, killer shrimp is able to predate on crayfish eggs and hatchlings even directly on females abdomens wehre they are incubated and protected. The results confirmed the theory of killer shrimp hazards to aquatic ecosystems and its potential to directly influence the populations of larger organisms. At the same time, it has been found that killer shrimp may be a suitable prey for adult and subadult individuals of signal crayfish and adults of marbled crayfish.
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The verification of the mass induction of triploidy in brook charr in operating conditions.
 ŠVAGROVÁ, Kateřina
This bachelor thesis deals with the induction of triploidy in brook trout, Salvelinus fontinalis under farm conditions using a heat- and /or hydrostatic pressure shock. The first part involves the issues of polyploidy in fish, its induction, detection methods of polyploidy and its contribution to aquaculture. The second part deals with the technological process of induction of triploidy and subsequently, with evaluation of the effectiveness of both types of the shock upon ploidy level determine by flow cytometry. In this experiment, heat shock induced 80% of triploids in contrary to the hydrostatic pressure shock inducing triploidy in 100%. The pressure shock induced triploidy in brook trout more effectively than the heat shock and provided better operational results. Moreover, pressure shock displayed better fertilization of eggs, higher hatchability, and also higher percentage of triploids.
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2 Švagrová, Klára
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