Mgr. Michal Janáč, Ph.D.

Pozice: vědecký pracovník kmenový
Zaměření: ekologie ryb, biologické invaze
Oddělení: Pracoviště Brno
Telefon: +420 543 422 515

Výzkumné směry

  • biologické invaze,
  • ekologie raných vývojových stadií ryb,
  • metodika lovu ryb.


  • 1998-2003: magisterské studium - Masarykova universita Brno, přírodovědecká fakulta, obor zoologie. Diplomová práce: Metodika odlovu 0+ juvenilních ryb v tekoucích vodách.
  • 2003-2009: Ph.D. studium - Masarykova universita Brno, přírodovědecká fakulta, obor zoologie. Dizertační práce: Problematika odběrů a hodnocení společenstev 0+ juvenilních ryb.


  • 2002-2009: Ústav biologie obratlovců AV ČR - odborný VŠ pracovník,
  • 2010-současnost: Ústav biologie obratlovců AV ČR - postdoktorand.



Janáč M., Roche K., Šlapanský L., Polačik M., Jurajda P.: Long-term monitoring of native bullhead and invasive gobiids in the Danubian rip-rap zone, Hydrobiologia 807 (2018) 263-275.


Janáč M., Bryja J., Ondračková M., Mendel J., Jurajda P.: Genetic structure of three invasive gobiid species along the Danube-Rhine invasion corridor: similar distributions, different histories, Aquatic Invasions 12 (2017) 551-564.

Kvach Y., Janáč M., Nehring S., Ondračková M., Jurajda P.: Parasite communities and infection levels of the invasive Chinese sleeper Perccottus glenii (Actinopterygii: Odontobutidae) from the Naab river basin, Germany, Journal of Helminthology 91 (2017) 703-710.

Kvach Y., Ondračková M., Janáč M., Jurajda P.: The parasite community of round goby Neogobius melanostomus (Pallas, 1814) (Actinopterygii: Gobiidae) newly introduced into the upper Elbe, Knowledge and Management of Aquatic Ecosystems 418 (2017) .

Mikl L., Adámek Z., Všetičková L., Janáč M., Roche K., Šlapanský L., Jurajda P.: Response of benthic macroinvertebrate assemblages to round (Neogobius melanostomus, Pallas 1814) and tubenose (Proterorhinus semilunaris, Heckel 1837) goby predation pressure, Hydrobiologia 785 (2017) 219-232.

Polačik M., Janáč M.: Costly defense in a fluctuating environment-sensitivity of annual Nothobranchius fishes to predator kairomones, Ecology and Evolution 7 (2017) 4289-4298.

Reichard M., Janáč M., Polačik M., Blažek R., Vrtílek M.: Community assembly in Nothobranchius annual fishes: nested patterns, environmental niche and biogeographic history, Ecology and Evolution 7 (2017) 2294-2306.

Šlapanský L., Janáč M., Roche K., Mikl L., Jurajda P.: Expansion of round gobies in a non-navigable river system, Limnologica 67 (2017) 27-36.


Adámek Z., Mrkvová M., Zukal J., Roche K., Mikl L., Šlapanský L., Janáč M., Jurajda P.: Environmental quality and natural food performance at feeding sites in a carp (Cyprinus carpio) pond, Aquaculture International 24 (2016) 1591-1606.

Janáč M., Valová Z., Roche K., Jurajda P.: No effect of round goby Neogobius melanostomus colonisation on young-of-the-year fish density or microhabitat use, Biological Invasions 18 (2016) 2333-2347.

Janáč M., Konečná M., Roche K., Jurajda P.: Novelty versus environment: two viewpoints on the same phenomenon?, Ecology of Freshwater Fish 25 (2016) 678-681.

Jurajda P., Adámek Z., Janáč M., Roche K., Mikl L., Rederer L., Zapletal T., Koza V., Špaček J.: Use of multiple fish-removal methods during biomanipulation of a drinking water reservoir – Evaluation of the first four years, Fisheries Research 173 (2016) 101-108.

Konečná M., Janáč M., Roche K., Jurajda P.: Environment not "nativeness" dictates reproductive trait shifts in Ponto-Caspian gobies, Ecology of Freshwater Fish 25 (2016) 167-170.

Kvach Y., Ondračková M., Janáč M., Jurajda P.: Methodological issues affecting the study of fish parasites. I. Duration of live fish storage prior to dissection, Diseases of Aquatic Organisms 119 (2016) 107-115.

Kvach Y., Ondračková M., Janáč M., Jurajda P.: Methodological issues affecting the study of fish parasites. II. Sampling method affects ectoparasite studies, Diseases of Aquatic Organisms 121 (2016) 59-66.

Šlapanský L., Jurajda P., Janáč M.: Early life stages of exotic gobiids as new hosts for unionid glochidia, Freshwater Biology 61 (2016) 979-990.


Jurajda P., Adámek Z., Valová Z., Janáč M., Roche K.: Fish community and fisheries management of Brno Reservoir following revitalisation measures, Folia zoologica 64 (2015) 112-122.

Konečná M., Janáč M., Roche K., Jurajda P.: Variation in life-history traits between a newly established and long-established population of non-native pumpkinseed, Lepomis gibbosus (Actinopterygii: Perciformes: Centrarchidae), Acta Ichthyologica et Piscatoria 45 (2015) 385-392.

Polačik M., Jurajda P., Blažek R., Janáč M.: Carcass feeding as a cryptic foraging mode in round goby Neogobius melanostomus, Journal of Fish Biology 87 (2015) 194-199.

Roche K., Janáč M., Šlapanský L., Mikl L., Kopeček L., Jurajda P.: A newly established round goby (Neogobius melanostomus) population in the upper stretch of the river Elbe, Knowledge and Management of Aquatic Ecosystems 416 (2015) 33.

Valová Z., Konečná M., Janáč M., Jurajda P.: Population and reproductive characteristics of a non-native western tubenose goby (Proterorhinus semilunaris) population unaffected by gobiid competitors, Aquatic Invasions 10 (2015) 57-68.

Všetičková L., Janáč M., Roche K., Jurajda P.: Assessment of possible diel and sex-related differences in round goby (Neogobius melanostomus) diet, Folia zoologica 64 (2015) 104-111.


Valová Z., Janáč M., Švanyga J., Jurajda P.: Structure of 0+ juvenile fish assemblages in the modified upper stretch of the River Elbe, Czech Republic, Czech Journal of Animal Science 59 (2014) 35-44.

Všetičková L., Janáč M., Vašek M., Roche K., Jurajda P.: Non-native western tubenose gobies Proterorhinus semilunaris show distinct site, sex and age-related differences in diet, Knowledge and Management of Aquatic Ecosystems 414 (2014) 1-19.


Adámek Z., Zahrádková S., Jurajda P., Bernardová I., Jurajdová Z., Janáč M., Němejcová D.: The response of benthic macroinvertebrate and fish assemblages to human impact along the lower stretch of the rivers Morava and Dyje (Danube basin, Czech Republic), Croatian Journal of Fisheries 71 (2013) 93-115.

Janáč M., Šlapanský L., Valová Z., Jurajda P.: Downstream drift of round goby (Neogobius melanostomus) and tubenose goby (Proterorhinus semilunaris) in their non-native area, Ecology of Freshwater Fish 22 (2013) 430-438.

Janáč M., Jurajda P.: Diel differences in 0+ fish samples: effect of river size and habitat, River Research and Applications 29 (2013) 90-98.

Janáč M., Jurajda P., Kružíková L., Roche K., Prášek V.: Reservoir to river passage of age-0+ year fishes, indication of a dispersion pathway for a non-native species, Journal of Fish Biology 82 (2013) 994-1010.

Roche K., Janáč M., Jurajda P.: A review of Gobiid expansion along the Danube-Rhine corridor – geopolitical change as a driver for invasion, Knowledge and Management of Aquatic Ecosystems 411 (2013) .


Janáč M., Valová Z., Jurajda P.: Range expansion and habitat preferences of nonnative 0+ tubenose goby (Proterorhinus semilunaris) in two lowland rivers in the Danube basin, Fundamental and Applied Limnology / Archiv für Hydrobiologie 181 (2012) 73-85.

Polačik M., Janáč M., Vassilev M., Trichkova T.: Morphometric comparison of native and non-native populations of round goby Neogobius melanostomus from the River Danube, Folia zoologica 61 (2012) 1-8.


Janáč M., Jurajda P.: Mortality induced by electrofishing and handling in five young-of-the-year cyprinids: effect of the fish size, species and anode size, Journal of Applied Ichthyology 27 (2011) 990-994.


Janáč M., Jurajda P.: Modified sampling design for age-0 fish electrofishing at beach habitats, North American Journal of Fisheries Management 30 (2010) 1210-1220.

Janáč M., Ondračková M., Jurajda P., Valová Z., Reichard M.: Flood duration determines the reproduction success of fish in artificial oxbows in a floodplain of a potamal river, Ecology of Freshwater Fish 19 (2010) 644-655.

Jurajda P., Janáč M., Valová Z., Streck G.: Fish community in the chronically polluted middle Elbe River, Folia zoologica 59 (2010) 157-168.

Jurajda P., Adámek Z., Janáč M., Valová Z.: Longitudinal patterns in fish and macrozoobenthos assemblages reflect degradation of water quality and physical habitat in the Bílina river basin, Czech Journal of Animal Science 55 (2010) 123-136.

Valová Z., Jurajda P., Janáč M., Bernardová I., Hudcová H.: Spatiotemporal trends of heavy metal concentrations in fish of the River Morava (Danube basin), Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engineering 45 (2010) 1892-1899.


Jurajda P., Janáč M., White S.M., Ondračková M.: Small – but not easy: evaluation of sampling methods in floodplain lakes including whole-lake sampling, Fisheries Research 96 (2009) 102-108.

Polačik M., Janáč M., Jurajda P., Adámek Z., Ondračková M., Trichkova T., Vassilev M.: Invasive gobies in the Danube: invasion success facilitated by availability and selection of superior food resources, Ecology of Freshwater Fish 18 (2009) 640-649.


Loyka P., Adámek Z., Janáč M., Huml J.: Nová horní hranice výskytu hrouzka Kesslerova (Gobio kessleri Dybowski, 1862) v řece Moravě (ČR), Bulletin VÚRH Vodňany 44 (2008) 44-47.

Polačik M., Janáč M., Trichkova T., Vassilev M., Keckeis H., Jurajda P.: The distribution and abundance of the Neogobius fishes in their native range (Bulgaria) with notes on the non-native range in the Danube River, Large Rivers 18 (2008) 193-208.

Polačik M., Trichkova T., Janáč M., Vassilev M., Jurajda P.: The ichthyofauna of the shoreline zone in the longitudinal profile of the Danube River, Bulgaria, Acta Zoologica Bulgarica 60 (2008) 77-88.

Polačik M., Janáč M., Jurajda P., Vassilev M., Trichkova T.: The sampling efficiency of electrofishing for Neogobius species in a riprap habitat: a field experiment, Journal of Applied Ichthyology 24 (2008) 601-604.