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, 852: 2409-2426.
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, 94: 693-705.
Ondračková M, Tkachenko M, Vetešník L, Hronek J, Janáč M (2025). Distribution and host range of a highly invasive parasitic copepod. Hydrobiologia, 852: 2221-2239.
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, :.

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, 73: 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, 31: e12726.

2023

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, 71: 163-169.
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, 53: 1.
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, 102: 426-442.
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, 13: 1464.

2022

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, 849: 4407-4425.
Jurajdová Z, Janáč M, Grmela J, Matrková J, Adámek Z, Jurajda P (2022). Rybí společenstvo středního toku říčky Bobrůvky. Acta rerum naturalium, 27: 7-12.
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, 51: 1-9.
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, 53: 4116-4127.
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, 12: e8990.

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, 70: 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, 70: 21050.
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, 70: 21052.
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, 98: 1155-1171.
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, 11: 16860.

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, 84: 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, 69: 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, 77: 475-483.

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, 14: 738-757.
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, 48: 56-65.

2018

David AA, Janáč M (2018). Twenty-year anniversary of the ICAIS: progress and challenges towards a better understanding of aquatic invasions. Aquatic Invasions, 13: 433-437.
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, 807: 263-275.
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, 127: 213-224.

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, 12: 551-564.
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, 91: 703-710.
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, 418: 19.
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, 785: 219-232.
Polačik M, Janáč M (2017). Costly defense in a fluctuating environment-sensitivity of annual Nothobranchius fishes to predator kairomones. Ecology and Evolution, 7: 4289-4298.
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, 7: 2294-2306.
Šlapanský L, Janáč M, Roche KF, Mikl L, Jurajda P (2017). Expansion of round gobies in a non-navigable river system. Limnologica, 67: 27-36.

2016

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, 24: 1591-1606.
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, 18: 2333-2347.
Janáč M, Konečná M, Roche KF, Jurajda P (2016). Novelty versus environment: two viewpoints on the same phenomenon?. Ecology of Freshwater Fish, 25: 678-681.
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, 173: 101-108.
Konečná M, Janáč M, Roche KF, Jurajda P (2016). Environment not "nativeness" dictates reproductive trait shifts in Ponto-Caspian gobies. Ecology of Freshwater Fish, 25: 167-170.
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, 121: 59-66.
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, 119: 107-115.
Šlapanský L, Jurajda P, Janáč M (2016). Early life stages of exotic gobiids as new hosts for unionid glochidia. Freshwater Biology, 61: 979-990.

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, 64: 112-122.
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, 45: 385-392.
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, 87: 194-199.
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, 416: 33.
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, 10: 57-68.
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, 64: 104-111.

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, 59: 35-44.
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, 414: 1-19.

2013

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, 29: 90-98.
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, 82: 994-1010.
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, 22: 430-438.
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, 411: 01.

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, eArchiv für Hydrobiologie.
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, 61: 1-8.

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, 27: 990-994.

2010

Janáč M, Jurajda P (2010). Modified sampling design for age-0 fish electrofishing at beach habitats. North American Journal of Fisheries Management, 30: 1210-1220.
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, 19: 644-655.
Jurajda P, Janáč M, Valová Z, Streck G (2010). Fish community in the chronically polluted middle Elbe River. Folia zoologica, 59: 157-168.
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, 55: 123-136.
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, 45: 1892-1899.

2009

Jurajda P, Janáč M, White S, Ondračková M (2009). Small – but not easy: evaluation of sampling methods in floodplain lakes including whole-lake sampling. Fisheries Research, 96: 102-108.
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, 18: 640-649.

2008

Loyka P, Adámek Z, Janáč M, Huml J (2008). Nová horní hranice výskytu hrouzka Kesslerova (Gobio kessleri Dybowski, 1862) v řece Moravě (ČR). Bulletin VÚRH Vodňany, 44: 44-47.
Polačik M, Janáč M, Trichkova T, Vassilev M, Keckeis H, Jurajda P (2008). 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: 193-208.
Polačik M, Trichkova T, Janáč M, Vassilev M, Jurajda P (2008). The ichthyofauna of the shoreline zone in the longitudinal profile of the Danube River, Bulgaria. Acta Zoologica Bulgarica, 60: 77-881210 .
Polačik M, Janáč M, Jurajda P, Vassilev M, Trichkova T (2008). The sampling efficiency of electrofishing for Neogobius species in a riprap habitat: a field experiment. Journal of Applied Ichthyology, 24: 601-604.

2007

Janáč M, Jurajda P (2007). A comparison of point abundance and continuous sampling by electrofishing for age-0 fish in a channelized lowland river. North American Journal of Fisheries Management, 27: 1119-1125.
Jurajda P, Adámek Z, Janáč M, Valová Z (2007). Fish and macrozoobenthos in the Vlára stream drainage area (Bílé Karpaty Mountains). Czech Journal of Animal Science, 52: 214-225.

2006

Valová Z, Jurajda P, Janáč M (2006). Spatial distribution of 0+ juvenile fish in differently modified lowland rivers. Folia zoologica, 55: 293-308.

2005

Janáč M, Jurajda P (2005). Inter-calibration of three electric fishing techniques to estimate 0+ juvenile fish densities on sandy river beaches. Fisheries Management and Ecology, 12: 161-167.
Jurajda P, Černý J, Polačik M, Valová Z, Janáč M, Blažek R, Ondračková M (2005). The recent distribution and abundance of non-native Neogobius fishes in the Slovak section of the River Danube. Journal of Applied Ichthyology, 21: 319-323.
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