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Genetická struktura populací lína Tinca tinca (Linnaeus, 1758)
Lajbner, Zdeněk ; Linhart, Otomar ; Kotlík, Petr
The tench is an important fish for aquaculture, which is undergoing intensive domestication, but only few studies have examined genetic structure of its populations. We present first results of a phylogeographic study based on DNA sequence data for four nuclear genes and one mitochondrial DNA gene from throughout the tench geographical distribution, including some of the known transfers outside its native Eurasian range. The multiple gene dataset revealed a strong phylogeographic partitioning between the western and eastern parts of the species range with a wide zone of overlap in Europe. Tench in European aquaculture largely represent mixtures of the two evolutionary lineages. We will discuss the likely historical processes underlying these findings. We suggest that human-mediated dispersal may have played an important role in shaping the present phylogeographic pattern.
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How shall we study the fish stock of our large water reservoirs?
Kubečka, Jan ; Matěna, Josef ; Čech, Martin ; Draštík, Vladislav ; Frouzová, Jaroslava ; Hohausová, Eva ; Jarolím, Oldřich ; Jůza, Tomáš ; Kratochvíl, Michal ; Muška, Milan ; Peterka, Jiří ; Prchalová, Marie ; Říha, Milan ; Tušer, Michal ; Vašek, Mojmír
Quantitative fish stock assessment recently advanced significantly in the Czech Republic. Sampling of open water was facilitated by application of scientific echosounders, trawls, Nordic multimesh gillnets, purse seines and booming electoshockers. Simplified combination of the above methods was recommended for the monitoring of larger stagnant water the Water Framework Directive of EU. Combination of all above approaches with more classic ones (beach seining, benthic gillnets) is being used for „complex fish stock assessment“ providing the assessment of abundance, biomass, species and age composition of all important species in all important habitats of the reservoirs. Further improvements of results is likely to be achieved by the application of multibeam acoustic cameras and by mitigation of the problems connected with quantitative trawling of large fish
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Ontogeny of coloration patterns in Neotropical cichlids of the Tribe Heroini (TELEOSTEI: CICHLIDAE: CICHLASOMATINAE)
Muška, Milan ; Říčan, O. ; Novák, J.
We have studied the ontogeny of Cichlid fishes of the tribe Heroini, using developmental series. By observing the development of pigment patterns in larval, juvenile and adult cichlids, the homologous elements of the lateral barring pattern have been hypothesized. Although pigmentation is often disregarded as a source of characters containing historical information, the congruence of many of these characters with a recent phylogeny of heroini, suggest their utility. A common mechanism underlying pattern formation is suggested based on similarities between Neotropical and African Cichlids.
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