Mgr. Michal Janáč Ph.D.

Position full-time researcher
Direction fish ecology, biological invasions

+420 543 422 515

Research interests

  • biological invasion,
  • ecology of fish early life stages,
  • fish sampling methodology.

Running Projects

Biodiversity analysis and proposition of management of newly built small water reservoirs and pools in South Moravian Region (2024–2026)

Education

  • 1998-2003: undergraduate study – Masaryk university Brno, Faculty of Sciences, Zoology. Thesis: Methodology of 0+ fish sampling in flowing waters.
  • 2003-2009: Ph.D. study – Masaryk university Brno, Faculty of Sciences, Zoology. Thesis: Sampling and evaluation of the young-of-the-year fish assemblages.

Employment

  • 2002-2009: Institute of Vertebrate Biology AS CR – research assistant,
  • 2010-2015: Institute of Vertebrate Biology AS CR – post-doc,
  • 2016-present: Institute of Vertebrate Biology AS CR – research scientist.

Publications and Applied outputs

2025

Hnilička M, Janáč M, Palupová E, Tkachenko M, Horká P, Jandová K, Holubová K, Jurajda P, Ondračková M (2025). Stable isotope analysis reveals fish juveniles as a temporal main resource consumed by invasive pumpkinseed (Lepomis gibbosus). Hydrobiologia.
Horsák M, Janáč M, Zhai M, Bojková J (2025). Temporal niche dynamics of spreading native invertebrates underlie doubling of richness in pristine temperate streams. Journal of Animal Ecology.
McCallum ES, Sefc KM, Brodin T, Burkhardt-Holm P, Bussmann-Charran K, Florin AB, Geist J, Janáč M, Jurajda P, Martin JM, Pander J, Bose APH (2025). Round goby population differentiation across river barriers in Central Europe. Aquatic Invasions.
Ondračková M, Tkachenko M, Vetešník L, Hronek J, Janáč M (2025). Distribution and host range of a highly invasive parasitic copepod. Hydrobiologia.
Ondračková M, Valigurová A, Hodová I, Bartáková V, Tkachenko M, Janáč M, Vetešník L (2025). Diplostomum-induced sac formation in lenses of Ameiurus bullheads: A host defence response?. Journal of Fish Diseases, e14137.

2024

Pakosta T, Vetešník L, Janáč M, Hyršl P, Šimková A (2024). Vigour-related traits of gibel carp (Carassius gibelio): do they represent reproduction-associated costs facilitating the coexistence of asexual and sexual forms?. Journal of Vertebrate Biology, 24005.
Šlapanský L, Janáč M, Jurajda P (2024). Effect of stocking on brown trout angling catch rates in the Czech Republic during 1996-2018. Fisheries Management and Ecology, e12726.
Janáč M, Jurajda P (2024). Methodology for assessing ecological potential of heavily modified and artificial water bodies of the river category according to the fish biological component. Certified Methodology ENV/2024/365682.

2023

Kvach Y, Tkachenko M, Bartáková V, Kutsokon Y, Janáč M, Demchenko V, Ondračková M (2023). Parasite communities and genetic structure of non-native pumpkinseed, Lepomis gibbosus, in different Black Sea drainages of Ukraine. Knowledge and Management of Aquatic Ecosystems, 1.
Jurajdová Z, Grmela J, Šlapanský L, Hnilička M, Janáč M, Adámek Z, Tkachenko M, Jurajda P (2023). Fish community of a heavily modified urban stretch of the River Svratka: fish rescue transfer prior to the initiation of flood protection constructions. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis.
Pravdová M, Kolářová J, Grabicová K, Janáč M, Randák T, Ondračková M (2023). Response of parasite community composition to aquatic pollution in common carp (Cyprinus carpio L.): a semi-experimental study. Animals, 1464.
Ondračková M, Tkachenko M, Bartáková V, Bryjová A, Janáč M, Zięba G, Pyrzanowski K, Kvach Y (2023). Population genetic structure, parasite infection and somatic condition of pumpkinseed Lepomis gibbosus (Actinopterygii: Centrarchidae) in the Oder river basin. Journal of Fish Biology.

2022

Reichard M, Janáč M, Blažek R, Žák J, Alila OD, Polačik M (2022). Patterns and drivers of Nothobranchius killifish diversity in lowland Tanzania. Ecology and Evolution, e8990.
Pravdová M, Kolářová J, Grabicová K, Randák T, Janáč M, Kvach Y, Jurajda P, Ondračková M (2022). Pharmaceutical contamination and biotic factors affecting parasitism in common carp (Cyprinus carpio). Aquaculture Research.
Kvach Y, Kutsokon Y, Janáč M, Dykyy I, Dzyziuk N, Dudliv I, Nazaruk K (2022). Parasites of the invasive Chinese sleeper Perccottus glenii (Actinopterygii: Odontobutidae) in the region of the first introduction of the Carpathian population. Oceanological and Hydrobiological Studies.
Jurajdová Z, Janáč M, Grmela J, Matrková J, Adámek Z, Jurajda P (2022). The fish community along the middle stretch of the Bobrůvka stream. Acta rerum naturalium.
Janáč M, Šlapanský L, Kopeček L, Prudík B, Mrkvová M, Halačka K, Jurajda P (2022). Fine-scale microhabitat niche separation allows coexistence of two invasive species. Hydrobiologia.

2021

Jurajda P, Streck G, Roche K, Janáč M, Jurajdová Z (2021). Impact of multiple stressors on the fish community pattern along a highly degraded Central European river - a case study. Journal of Vertebrate Biology, 20066.
Ondračková M, Janáč M, Borcherding J, Grabowska J, Bartáková V, Jurajda P (2021). Non-native gobies share predominantly immature parasites with local fish hosts. Journal of Vertebrate Biology, 21050.
Šimková A, Gettová L, Civáňová K, Seifertová M, Janáč M, Vetešník L (2021). Diversity of MHC IIB genes and parasitism in hybrids of evolutionarily divergent cyprinoid species indicate heterosis advantage. Scientific Reports, 16860.
Šimková A, Janáč M, Hyršl P, Krasnovyd V, Vetešník L (2021). Vigour-related traits and immunity in hybrids of evolutionary divergent cyprinoid species: advantages of hybrid heterosis?. Journal of Fish Biology.
Roche K, Šlapanský L, Trávník M, Janáč M, Jurajda P (2021). The importance of rip-rap for round goby invasion success - a field habitat manipulation experiment. Journal of Vertebrate Biology, 21052.

2020

Jurajda P, Všetičková L, Švecová H, Kolářová J, Jurajdová Z, Janáč M, Roche K (2020). Trophic mercury biomagnification patterns in two European rivers following introduction of invasive round gobies (Neogobius melanostomus). Limnologica, 125817.
Nezhybová V, Janáč M, Reichard M, Ondračková M (2020). Risk-taking behaviour in African killifish – a case of parasitic manipulation?. Journal of Vertebrate Biology, 20022.
Šlapanský L, Janáč M, Roche K, Jurajda P (2020). Round goby movement patterns in a non-navigable river. Canadian Journal of Fisheries and Aquatic Sciences.
Janáč M, Jurajda P, Polášek M, Němejcová D (2020). Methodology of ecological status assessment of surface water bodies (category river) using fish fauna. Certified Methodology ENV/2020/20481.

2019

Janáč M, Jurajdová Z, Roche KF, Šlapanský L, Jurajda P (2019). An isolated round goby population in the upper Elbe: population characteristics and short-term impacts on the native fish assemblage. Aquatic Invasions.
Kvach Y, Ondračková M, Janáč M, Krasnovyd V, Seifertová M, Jurajda P (2019). Parasites of round goby, Neogobius melanostomus, currently invading the Elbe River. Oceanological and Hydrobiological Studies.
Jurajda P, Slavík O, Adámek Z, Janáč M (2019). Sampling of young-of-the-year fishes in rivers. New version. Certified Methodology.

2018

Janáč M, Roche KF, Šlapanský L, Polačik M, Jurajda P (2018). Long-term monitoring of native bullhead and invasive gobiids in the Danubian rip-rap zone. Hydrobiologia.
David AA, Janáč M (2018). Twenty-year anniversary of the ICAIS: progress and challenges towards a better understanding of aquatic invasions. Aquatic Invasions.
Kvach Y, Ondračková M, Janáč M, Jurajda P (2018). Methodological issues affecting the study of fish parasites. III. Effect of fish preservation method. Diseases of Aquatic Organisms.

2017

Janáč M, Bryja J, Ondračková M, Mendel J, Jurajda P (2017). Genetic structure of three invasive gobiid species along the Danube-Rhine invasion corridor: similar distributions, different histories. Aquatic Invasions.
Kvach Y, Janáč M, Nehring S, Ondračková M, Jurajda P (2017). Parasite communities and infection levels of the invasive Chinese sleeper Perccottus glenii (Actinopterygii: Odontobutidae) from the Naab river basin, Germany. Journal of Helminthology.
Mikl L, Adámek Z, Všetičková L, Janáč M, Roche KF, Šlapanský L, Jurajda P (2017). Response of benthic macroinvertebrate assemblages to round (Neogobius melanostomus, Pallas 1814) and tubenose (Proterorhinus semilunaris, Heckel 1837) goby predation pressure. Hydrobiologia.
Polačik M, Janáč M (2017). Costly defense in a fluctuating environment-sensitivity of annual Nothobranchius fishes to predator kairomones. Ecology and Evolution.
Reichard M, Janáč M, Polačik M, Blažek R, Vrtílek M (2017). Community assembly in Nothobranchius annual fishes: nested patterns, environmental niche and biogeographic history. Ecology and Evolution.
Šlapanský L, Janáč M, Roche KF, Mikl L, Jurajda P (2017). Expansion of round gobies in a non-navigable river system. Limnologica.
Kvach Y, Ondračková M, Janáč M, Jurajda P (2017). The parasite community of round goby Neogobius melanostomus (Pallas, 1814) (Actinopterygii: Gobiidae) newly introduced into the upper Elbe. Knowledge and Management of Aquatic Ecosystems, 19.

2016

Kvach Y, Ondračková M, Janáč M, Jurajda P (2016). Methodological issues affecting the study of fish parasites. II. Sampling method affects ectoparasite studies. Diseases of Aquatic Organisms.
Šlapanský L, Jurajda P, Janáč M (2016). Early life stages of exotic gobiids as new hosts for unionid glochidia. Freshwater Biology.
Jurajda P, Adámek Z, Janáč M, Roche KF, Mikl L, Rederer L, Zapletal T, Koza V, Špaček J (2016). Use of multiple fish-removal methods during biomanipulation of a drinking water reservoir – Evaluation of the first four years. Fisheries Research.
Kvach Y, Ondračková M, Janáč M, Jurajda P (2016). Methodological issues affecting the study of fish parasites. I. Duration of live fish storage prior to dissection. Diseases of Aquatic Organisms.
Konečná M, Janáč M, Roche KF, Jurajda P (2016). Environment not "nativeness" dictates reproductive trait shifts in Ponto-Caspian gobies. Ecology of Freshwater Fish.
Adámek Z, Mrkvová M, Zukal J, Roche KF, Mikl L, Šlapanský L, Janáč M, Jurajda P (2016). Environmental quality and natural food performance at feeding sites in a carp (Cyprinus carpio) pond. Aquaculture International.
Janáč M, Valová Z, Roche KF, Jurajda P (2016). No effect of round goby Neogobius melanostomus colonisation on young-of-the-year fish density or microhabitat use. Biological Invasions.
Janáč M, Konečná M, Roche KF, Jurajda P (2016). Novelty versus environment: two viewpoints on the same phenomenon?. Ecology of Freshwater Fish.

2015

Jurajda P, Adámek Z, Valová Z, Janáč M, Roche KF (2015). Fish community and fisheries management of Brno Reservoir following revitalisation measures. Folia zoologica.
Konečná M, Janáč M, Roche KF, Jurajda P (2015). 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.
Polačik M, Jurajda P, Blažek R, Janáč M (2015). Carcass feeding as a cryptic foraging mode in round goby Neogobius melanostomus. Journal of Fish Biology.
Roche KF, Janáč M, Šlapanský L, Mikl L, Kopeček L, Jurajda P (2015). A newly established round goby (Neogobius melanostomus) population in the upper stretch of the river Elbe. Knowledge and Management of Aquatic Ecosystems.
Valová Z, Konečná M, Janáč M, Jurajda P (2015). Population and reproductive characteristics of a non-native western tubenose goby (Proterorhinus semilunaris) population unaffected by gobiid competitors. Aquatic Invasions.
Všetičková L, Janáč M, Roche KF, Jurajda P (2015). Assessment of possible diel and sex-related differences in round goby (Neogobius melanostomus) diet. Folia zoologica.

2014

Valová Z, Janáč M, Švanyga J, Jurajda P (2014). Structure of 0+ juvenile fish assemblages in the modified upper stretch of the River Elbe, Czech Republic. Czech Journal of Animal Science.
Všetičková L, Janáč M, Vašek M, Roche KF, Jurajda P (2014). Non-native western tubenose gobies Proterorhinus semilunaris show distinct site, sex and age-related differences in diet. Knowledge and Management of Aquatic Ecosystems.

2013

Janáč M, Šlapanský L, Valová Z, Jurajda P (2013). Downstream drift of round goby (Neogobius melanostomus) and tubenose goby (Proterorhinus semilunaris) in their non-native area. Ecology of Freshwater Fish.
Roche KF, Janáč M, Jurajda P (2013). A review of Gobiid expansion along the Danube-Rhine corridor – geopolitical change as a driver for invasion. Knowledge and Management of Aquatic Ecosystems.
Janáč M, Jurajda P, Kružíková L, Roche KF, Prášek V (2013). Reservoir to river passage of age-0+ year fishes, indication of a dispersion pathway for a non-native species. Journal of Fish Biology.
Adámek Z, Zahrádková S, Jurajda P, Bernardová I, Jurajdová Z, Janáč M, Němejcová D (2013). 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: 93-115.
Janáč M, Jurajda P (2013). Diel differences in 0+ fish samples: effect of river size and habitat. River Research and Applications.

2012

Janáč M, Valová Z, Jurajda P (2012). Range expansion and habitat preferences of nonnative 0+ tubenose goby (Proterorhinus semilunaris) in two lowland rivers in the Danube basin. Fundamental and Applied Limnology.
Polačik M, Janáč M, Vassilev M, Trichkova T (2012). Morphometric comparison of native and non-native populations of round goby Neogobius melanostomus from the River Danube. Folia zoologica.

2011

Janáč M, Jurajda P (2011). 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.

2010

Janáč M, Ondračková M, Jurajda P, Valová Z, Reichard M (2010). Flood duration determines the reproduction success of fish in artificial oxbows in a floodplain of a potamal river. Ecology of Freshwater Fish.
Valová Z, Jurajda P, Janáč M, Bernardová I, Hudcová H (2010). 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.
Jurajda P, Janáč M, Valová Z, Streck G (2010). Fish community in the chronically polluted middle Elbe River. Folia zoologica.
Jurajda P, Adámek Z, Janáč M, Valová Z (2010). 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.
Janáč M, Jurajda P (2010). Modified sampling design for age-0 fish electrofishing at beach habitats. North American Journal of Fisheries Management.

2009

Jurajda P, Janáč M, White S, Ondračková M (2009). Malé ale nesnadné: porovnání odlovných metod v aluviálním zemníku včetně celkového zátahu. Fisheries Research.
Polačik M, Janáč M, Jurajda P, Adámek Z, Ondračková M, Trichkova T, Vassilev M (2009). Invasive gobies in the Danube: invasion success facilitated by availability and selection of superior food resources. Ecology of Freshwater Fish.

2008

Polačik M, Janáč M, Jurajda P, Vassilev M, Trichkova T (2008). Účinnost elektrolovu zástupců rodu Neogobius v kamenném záhozu: terénní experiment. Journal of Applied Ichthyology.
Polačik M, Trichkova T, Janáč M, Vassilev M, Jurajda P (2008). Ichtyofauna příbřežní zóny v podélném profilu bulharského úseku Dunaje. Acta Zoologica Bulgarica, 60: 77-88.
Polačik M, Janáč M, Trichkova T, Vassilev M, Keckeis H, Jurajda P (2008). Rozšíření a početnosti zástupců rodu Neogobius v jejich původní oblasti (Bulharsko) s poznámkami k jejich rozšíření v nepůvodní oblasti v rámci toku Dunaje. Large Rivers, 18: 193-208.
Loyka P, Adámek Z, Janáč M, Huml J (2008). New upper limit of Kessler's gudgeon (Gobio kessleri Dybowski, 1862) occurrence in the Morava River (The Czech Republic). Bulletin VÚRH Vodňany, 44: 44-47.

2007

Janáč M, Jurajda P (2007). Porovnání bodového a kontinuálního elektrolovu pro odlov 0+ ryb. North American Journal of Fisheries Management.
Jurajda P, Adámek Z, Janáč M, Valová Z (2007). Ryby a makrozoobentos v povodí řeky Vláry (Bílé Karpaty). Czech Journal of Animal Science.

2006

Valová Z, Jurajda P, Janáč M (2006). Prostorová distribuce 0+ juvenilních ryb v různě upravených nížinných tocích. Folia zoologica.

2005

Janáč M, Jurajda P (2005). Vzájemná kalibrace tří technik elektrolovu pro odhady hustot 0+ juvenilních ryb na říčních písečných plážích. Fisheries Management and Ecology.
Jurajda P, Černý J, Polačik M, Valová Z, Janáč M, Blažek R, Ondračková M (2005). Současné rozšíření a abundance nepůvodních ryb rodu Neogobius ve slovenském úseku Dunaje. Journal of Applied Ichthyology.
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