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Influence of selected factors on reproduction of fish \kur{Betta splendens}
 HOMOLKA, Václav
The Siamese fighting fish (Betta splendens; order Perciformes, family Osphronemidae) is a fish occurring in the area of south east Asia. Above branchial organ (so-called labyrinth) allowes it to breath an air oxygen. It is a territorial sort of fish, males are brawling to each other. In a breeding fish take alive or frozen food and also artificial feed. The fish is bubblenest, spawns are put into a foam nest, built by a male, that takes care about the posterity for some time. The task of the work was to verify the influence of chosen feeds sorts and concentration of humic substances in water for a success in reproduction of Betta splendens fish. The experiment was performed in an aquarium room at institute of biological disciplines AF USB. The experimental work started on 12. 12. 2011 and was finished on 25. 2. 2013. Tested fish were by particular couples put into tanks, at which there were breeding afterwards. It was evaluated the frequency of spawns and the number of embryos. From the result of the work there is obvious that the feeding by a beef heart was preferable for fish´s fertility in a monitored time area about approximatelly 75% in comparison to feeding by a chicken breasts muscles. The presence, or more precisely the concentration of humic substances obviously did not affected the fertility. All fish´s groups embodied higher grade of fertility at the beginning of the monitored time area (probably higher fertility at younger - more vital fish). Siamese fighting fish is very demanded fish at aquarists, this is why is very important to evaluate certain parameters of breeding and rearing of these fish.
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