- 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