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Reproduction of fish Anoptichthys jordani
BARDOUNOVÁ, Alena
The cave tetra (Anoptichthys jordani, now reclassified as Astyanax jordani) is a blind form of the Mexican banded tetra (Astyanax fasciatus mexicanus). It lives in the waters of underground caves in northern Mexico. In the conditions of complete darkness there, the cave tetra has gradually lost the need for eyes and colouring. The females are larger than the males and have a bulkier abdominal section. They are omnivorous, feeding on animal and plant matter. The aim of this research was to determine the influence of basic types of lighting system on the spawning and rearing of Anoptichthys jordani. The findings reveal that alternating light and dark are best used for successful spawning and rearing of this species. The ideal temperature for Anoptichthys jordani ranged from 23-24°C for breeding and from 25-26°C for spawning, with pH levels of 7-8 and a specific electrical conductivity of approx. 230 ?S/cm, and with dissolved oxygen levels in the water of approx. 8.00 mg/L. The monitoring required for compilation of the research project was performed in the aquarium room at the Department of Biological Sciences from February 2013 to March 2014. Fish aged approximately 1-3 years were used for the reproduction. The separated males and females were placed in spawning tanks at regular intervals, always in single pairs. The same experiment was conducted in parallel in conditions of light and absolute darkness. A WTW meter was used for measurement of the water values.
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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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Influence of selected factors on reproduction of fish Ancistrus multispinnis
BARDOUNOVÁ, Alena
The white-girdled bristlenose catfish (Ancistrus multispinnis) is found in South America in the Amazon Basin, especially along the bed of flowing bodies of water. The male can be recognised from the long, thick, bristling tentacles and odontodes on the head and cheek. Females either have no tentacles or short, thin ones. Ancistrus multispinnis is omnivorous but primarily consumes plant matter. It is a much sought-after fish and it is therefore important to determine the best form of breeding and rearing. The monitoring required for compilation of the research project was performed in the aquarium room at the Department of Biological Sciences from March 2011 to March 2012. Normal and albino variants of Ancistrus multispinnis were used for reproduction. The tested fish were placed in 50 litre tanks where they then reproduced. A WTW meter, column (cation exchanger) and demineralisation filter were used for measurement of the values and for water treatment. The aim of the research project was to determine the influence of a selected form of feeding and water temperature on successful spawning of Ancistrus multispinnis. The findings reveal that, for successful spawning and breeding of these fish, the best form of feeding is to administer pellets specially designed for Ancistri, boiled nettles or lettuce leaves, finely shredded beef heart and even the occasional addition of pond plankton. The ideal water-temperature was revealed to be from 24-26 °C, pH 7-8, conductivity approx. 230 ?S/cm and oxygen content approx. 8.00 mg.l-1.
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