• abdomen – © Niefl/bearb. L. Richter
  • carapace – © Niefl/bearb. L. Richter
  • carpus – © Niefl/bearb. L. Richter
  • ridge – © Niefl/bearb. L. Richter
  • cervical groove – © Niefl/bearb. L. Richter
  • rostrum – © Niefl/bearb. L. Richter
  • dorsal groove – © Niefl/bearb. L. Richter
  • claw joint – © Niefl/bearb. L. Richter
  • morphology crayfish cs – © Niefl
  • morphology crayfish de – © Niefl
  • morphology crayfish en – © Niefl
  • Noble crayfish (Astacus astacus), mating – © F. Grunicke
  • Noble crayfish (Astacus astacus) – © M. Buřič & A. Kouba
  • Noble crayfish (Astacus astacus), female with eggs – © P. Kozak
  • Noble crayfish (Astacus astacus) – © P. Kozak
  • Noble crayfish (Astacus astacus) – © F. Grunicke
  • Noble crayfish (Astacus astacus), grey individual – © M. Buřič
  • Noble crayfish (Astacus astacus) – © P. Kozak
  • White-clawed crayfish (Austropotamobius pallipes), claws – © M. Buřič
  • White-clawed crayfish (Austropotamobius pallipes), claws – © M. Buřič
  • White-clawed crayfish (Austropotamobius pallipes) – © M. Buřič
  • White-clawed crayfish (Austropotamobius pallipes) – © M. Buřič
  • White-clawed crayfish (Austropotamobius pallipes) – © M. Buřič
  • Stone crayfish (Austropotamobius torrentium) – © M. Buřič & A. Kouba
  • Stone crayfish (Austropotamobius torrentium) – © M. Blaha
  • Stone crayfish (Austropotamobius torrentium) – © M. Blaha
  • Stone crayfish (Austropotamobius torrentium) – © M. Blaha
  • Stone crayfish (Austropotamobius torrentium), female (left) and male (right) – © P. Kozak
  • Chinese mitten crab (Eriocheir sinensis) – © A. Hartl
  • Chinese mitten crab (Eriocheir sinensis) – © M. Buřič
  • Chinese mitten crab (Eriocheir sinensis) – © F. Grunicke
  • Calico crayfish (Faxonius immunis), claws – © S. Worischka
  • Calico or papershell crayfish (Faxonius immunis) – © K. Grabow
  • Calico crayfish (Faxonius immunis) – © K. Grabow
  • Calico crayfish (Faxonius immunis) – © M. Buřič
  • Calico crayfish (Faxonius immunis), female – © S. Worischka
  • Spiny-cheek crayfish (Kamberkrebs), smaller claw was regrown – © S. Worischka
  • Spiny-cheek crayfish (Kamberkrebs), mating – © M. Buřič
  • Spiny-cheek crayfish (Faxonius limosus) – © M. Buřič & A. Kouba
  • Spiny-cheek crayfish (Faxonius limosus) – © P. Kozak
  • Spiny-cheek crayfish (Faxonius limosus) – © P. Kozak
  • Signal crayfish (Pacifastacus leniusculus), claws – © S. Worischka
  • Signal crayfish (Pacifastacus leniusculus) – © M. Buřič & A. Kouba
  • Signal crayfish (Pacifastacus leniusculus) – © S. Worischka
  • Signal crayfish (Pacifastacus leniusculus) – © M. Buřič
  • Signal crayfish (Pacifastacus leniusculus) – © S. Worischka
  • Narrow-clawed crayfish (Pontastacus leptodactylus) – © M. Buřič
  • Narrow-clawed crayfish (Pontastacus leptodactylus) – © M. Buřič & A. Kouba
  • Narrow-clawed crayfish (Pontastacus leptodactylus) – © M. Buřič
  • Red swamp crayfish (Procambarus clarkii), claws – © M. Buřič
  • Red swamp crayfish (Procambarus clarkii) – © V. Kašpar & A. Kouba
  • Red swamp crayfish (Procambarus clarkii) – © L. Hoogenstein / CC BY-SA (https://creativecommons.org/licenses/by-sa/4.0)
  • Red swamp crayfish (Procambarus clarkii) – © A. Hartl
  • Marbled crayfish (Procambarus virginalis) – © V. Kašpar & A. Kouba
  • Marbled crayfish (Procambarus virginalis) – © M. Blaha
  • Marbled crayfish (Procambarus virginalis) – © M. Buřič
  • Marbled crayfish (Procambarus virginalis) with juveniles – © M. Buřič
  • anal fin – © Niefl, bearb. L. Richter
  • bauchflossen_bauchstaendig – © R. Boskova, bearb. L. Richter
  • bauchflossen_bruststaendig – © R. Boskova, bearb. L. Richter
  • ventral fins/ pelvic fins – © Niefl, bearb. L. Richter
  • bauchflossen_kehlstaendig – © R. Boskova, bearb. L. Richter
  • pectoral fins – © Niefl, bearb. L. Richter
  • adipose fin – © Niefl, bearb. L. Richter
  • fin fold – © R. Boskova, bearb. L. Richter
  • fin, spiny rays (spines) – © Niefl, bearb. L. Richter
  • dorsal fin – © Niefl, bearb. L. Richter
  • fin, soft rays – © Niefl, bearb. L. Richter
  • morphology fish cs – © Niefl
  • morphology fish de – © Niefl
  • morphology fish en – © Niefl
  • Bream (Abramis brama) – © J. Freyhof
  • bleak (Alburnus alburnus) – © A. Hartl
  • Black bullhead (Ameiurus melas) – © J. Freyhof
  • Brown bullhead (Ameiurus nebulosus) – © A. Hartl
  • Brown bullhead (Ameiurus nebulosus) – © C. Köbsch
  • European eel (Anguilla anguilla) – © J. Freyhof
  • European eel (Anguilla anguilla) – © A. Hartl
  • European eel (Anguilla anguilla) – © A. Hartl
  • European eel (Anguilla anguilla) – © A. Hartl
  • Racer goby (Babka gamnotrachelus) – © J. Freyhof
  • Stone loach (Barbatula barbatula) – © S. Worischka
  • Stone loach (Barbatula barbatula) – © S. Worischka
  • Barbel (Barbus barbus) – © S. Worischka
  • Barbel (Barbus barbus) – © J. Freyhof
  • White bream (Blicca bjoerkna) – © G. Füllner
  • Goldfish (Carassius auratus) – © A. Hartl
  • Crucian carp (Carassius carassius) – © J. Freyhof
  • Prussian carp (Carassius gibelio) – © A. Hartl
  • Nase (Chondrostoma nasus) – © J. Freyhof
  • Nase (Chondrostoma nasus), mouth – © J. Schneider
  • Nase (Chondrostoma nasus) – © S. Tannenberg
  • Spined loach (Cobitis elongatoides) – © J. Freyhof
  • Spined loach (Cobitis taenia) – © J. Freyhof
  • Whitefish (Coregonus maraena) – © A. Hartl
  • European bullhead (Cottus gobio) – © F. Grunicke
  • European bullhead (Cottus gobio) – © S. Worischka
  • European bullhead (Cottus gobio) – © S. Worischka
  • Alpine bullhead (Cottus poecilopus) – © J. Freyhof
  • Grass carp (Ctenopharyngodon idella) – © A. Hartl
  • Common carp (Cyprinus carpio) – © T. Schiller
  • Northern pike (Esox lucius) – © T. Schiller
  • Northern pike (Esox lucius) – © S. Worischka
  • Northern pike (Esox lucius) – © T. Schiller
  • Three-spined stickleback (Gasterosteus aculeatus), male at the nest – © S. Worischka
  • Three-spined stickleback (Gasterosteus aculeatus), male at the nest – © S. Worischka
  • Three-spined stickleback (Gasterosteus aculeatus), male and female – © S. Worischka
  • Three-spined stickleback (Gasterosteus aculeatus) – © J. Freyhof
  • Gudgeon (Gobio gobio) – © C. Hellmann
  • Eurasian ruffe (Gymnocephalus cernua) – © J. Freyhof
  • Silver carp (Hypophtalmichthys molitrix) – © A. Hartl
  • Bighead carp (Hypophtalmichthys nobilis) – © A. Hartl
  • Brook lamprey (Lampetra planeri) – © A. Hartl
  • Brook lamprey (Lampetra planeri) – © A. Hartl
  • Brook lamprey (Lampetra planeri) – © A. Hartl
  • Brook lamprey (Lampetra planeri) – © A. Hartl
  • Pumpkinseed (Lepomis gibbosus) – © G. Füllner
  • Belica (Leucaspius delineatus) – © J. Freyhof
  • Asp (Leuciscus aspius) – © J. Freyhof
  • Ide (Leuciscus idus) – © A. Hartl
  • Dace (Leuciscus leuciscus) – © A. Hartl
  • Dace (Leuciscus leuciscus) – © J. Freyhof
  • Burbot (Lota lota) – © A. Hartl
  • Burbot (Lota lota) – © J. Freyhof
  • Largemouth bass (Micropterus salmoides) – © A. Hartl
  • Weatherfish (Misgurnus fossilis) – © J. Freyhof
  • Monkey goby (Neogobius fluviatilis), nuptial male – © J. Freyhof
  • Monkey goby (Neogobius fluviatilis) – © J. Freyhof
  • Round goby (Neogobius melanostomus) – © M. Blaha
  • Round goby (Neogobius melanostomus) – © S. Worischka
  • Round goby (Neogobius melanostomus) – © S. Worischka
  • Round goby (Neogobius melanostomus) – © S. Worischka
  • Round goby (Neogobius melanostomus) – © S. Worischka
  • Rainbow trout (Oncorhynchus mykiss) – © A. Hartl
  • Rainbow trout (Oncorhynchus mykiss) – © S. Worischka
  • European perch (Perca fluviatilis) – © T. Schiller
  • European perch (Perca fluviatilis) – © S. Tannenberg
  • European perch (Perca fluviatilis) – © T. Schiller
  • Chinese/ Amur sleeper (Perccottus glenii) – © J. Freyhof
  • Sea lamprey (Petromyzon marinus) – © A. Hartl
  • Sea lamprey (Petromyzon marinus) – © A. Hartl
  • Minnow (Phoxinus phoxinus) – © A. Hartl
  • Minnow (Phoxinus phoxinus) – © A. Hartl
  • Kessler’s / bighead goby (Ponticola kessleri) – © T. Schiller
  • Kessler’s / bighead goby (Ponticola kessleri) – © J. Freyhof
  • Tubenose goby (Proterorhinus semilunaris) – © S. Worischka
  • Tubenose goby (Proterorhinus semilunaris) – © S. Worischka
  • Stone moroko/ topmouth gudgeon (Pseudorasbora parva) – © G. Füllner
  • Stone moroko/ topmouth gudgeon (Pseudorasbora parva) – © Seotaro, (cleaned up and denoised by Estrilda, and edited by Laitche) / CC BY-SA (https://creativecommons.org/licenses/by-sa/3.0)
  • Nine-spined stickleback (Pungitius pungitius) – © A. Hartl
  • Bitterling (Rhodeus amarus) – © J. Freyhof
  • Roach (Rutilus rutilus) – © G. Füllner
  • Roach (Rutilus rutilus, foregound center) – © S. Tannenberg
  • Atlantic salmon (Salmo salar) – © A. Hartl
  • Atlantic salmon (Salmo salar), head of a male – © J. Freyhof
  • Atlantic salmon (Salmo salar) – © J. Freyhof
  • Brown trout (Salmo trutta fario) – © A. Hartl
  • Brown trout (Salmo trutta fario) – © A. Hartl
  • Brown trout (Salmo trutta fario) – © A. Hartl
  • Brook trout (Salvelinus fontinalis) – © A. Hartl
  • Zander (Sander lucioperca) – © J. Freyhof
  • Rudd (Scardinius erythrophthalmus) – © G. Füllner
  • European catfish (Silurus glanis) – © A. Hartl
  • Chub (Squalius cephalus) – © A. Hartl
  • Chub (Squalius cephalus) – © S. Tannenberg
  • Chub (Squalius cephalus, in the foreground) – © S. Tannenberg
  • Grayling (Thymallus thymallus) – © A. Hartl
  • Tench (Tinca tinca) – © J. Freyhof
  • Vimba (Vimba vimba) – © A. Hartl
  • killer shrimp (Dikerogammarus villosus) – © S. Worischka
  • gammarid (Gammarus fossarum) – © S. Worischka
  • graph CZ neozoa Elbe –
  • graph DE neozoa Elbe –
  • graph EN neozoa Elbe –
  • Becherlupe_3187_S_Worischka – © S. Worischka
  • citizen-science_querformat – © M. Buřič (1), L. Richter (2), S. Worischka (3, 6-9), M. Köster (4), T. Schiller (5)
  • citizen-science_quadratisch – © M. Buřič (1), L. Richter (2), S. Worischka (3-9), M. Köster (4)
  • European bullhead (Cottus gobio) – © S. Worischka
  • MZB_Sortieren_3580_S_Worischka – © S. Worischka
  • App-map_0074a_S_Worischka – © S. Worischka
  • Roman snail (Helix pomatia) – © S. Worischka
  • Edelweiss (Leontopodium alpinum) – © S. Worischka
  • Corn poppy/ red poppy (Papaver rhoeas) – © S. Worischka
  • Wheat (Triticum sp.) & Corn poppy/ red poppy (Papaver rhoeas) – © S. Worischka
  • Common grape vine (Vitis vinifera) – © K. Richter
  • Common toad (Bufo bufo) – © S. Worischka
  • Waterstarwort (Callitriche sp.) – © S. Worischka
  • Eurasian beaver (Castor fiber) – © S. Worischka
  • Red deer (Cervus elaphus) – © F. Grunicke
  • Touch-me-not balsam (Impatiens noli-tangere) – © S. Worischka
  • Eurasian otter (Lutra lutra) – © S. Worischka
  • Mouse (Mus musculus) – © F. Grunicke
  • Eurasian water-milfoil (Myriophyllum spicatum) – © S. Worischka
  • Curly-leaf pondweed (Potamogeton crispus) – © S. Worischka
  • Water soldier (Stratiotes aloides) – © F. Grunicke
  • Starling (Sturnus vulgaris) – © F. Grunicke
  • Common or smooth newt (Triturus vulgaris) – © S. Worischka
  • Red fox (Vulpes vulpes) – © F. Grunicke
  • Mandarin duck (Aix galericulata) – © L. Richter
  • Egyptian goose (Alopochen aegyptiacus) – © S. Worischka
  • Asian clam (Corbicula fluminea) – © L. Richter
  • Zebra mussel (Dreissena polymorpha) – © F. Grunicke
  • Argentinian waterweed (Egeria densa) – © S. Worischka
  • Japanese knotweed (Fallopia japonica) – © S. Worischka
  • Policeman’ s helmet (Impatiens glandulifera) – © J. Worischka
  • Colorado potato beetle (Leptinotarsa decemlineata) – © M. Welling
  • Coypu (Myocastor coypus) – © L. Richter
  • Muskrat (Ondatra zibethicus) – © F. Grunicke
  • Raccoon (Procyon lotor) – © S. Worischka
  • European rabbit (Oryctolagus cuniculus) – © S. Worischka
  • Tomato (Solanum lycopersicum) – © K. Richter
  • Potato (Solanum tuberosum) – © L. Richter
  • 24-h sampling River Elbe – © L. Richter
  • River Elbe upstream of Bad Schandau – © S. Worischka
  • Distribution of Astacus astacus in Europe (Kouba et al. 2014) – © A. Kouba
  • Distribution of Austropotamobius pallipes in Europe (Kouba et al. 2014) – © A. Kouba
  • Distribution of Austropotamobius torrentium in Europe (Kouba et al. 2014) – © A. Kouba
  • Distribution of Faxonius immunis in Europe (Kouba et al. 2014) – © A. Kouba
  • Distribution of Faxonius limosus in Europe (Kouba et al. 2014) – © A. Kouba
  • Distribution of Pacifastacus leniusculus in Europe (Kouba et al. 2014) – © A. Kouba
  • Distribution of Pontastacus leptodactylus in Europe (Kouba et al. 2014) – © A. Kouba
  • Distribution of Procambarus clarkii in Europe (Kouba et al. 2014) – © A. Kouba
  • Distribution of Procambarus virginalis in Europe (Kouba et al. 2014) – © A. Kouba
  • Freshwater pearl mussel (Margaritifera margaritifera) – © F. Grunicke