Fishes:
1. fish1.jpg: https://commons.wikimedia.org/wiki/File:Black_sea_fauna_stingray_01.jpg by Florin DUMITRESCU / public domain
2. fish2.jpg: https://species.wikimedia.org/wiki/File:Ameiurus_melas_by_Duane_Raver.png by Duane Raver / public domain
3. fish3.jpg: https://commons.wikimedia.org/wiki/File:Gullfiskur.jpg by Elma / CC BY 2.0
4. fish5.jpg: https://incubator.wikimedia.org/wiki/File:YellowPerch.jpg by Hadal / public domain
5. fish5.jpg: https://commons.wikimedia.org/wiki/File:Bowfin_fish_image.jpg by Duane Raver, U.S. Fish and Wildlife Service / public domain
6. fish6.jpg: https://commons.wikimedia.org/wiki/File:Aquarium_tropical_du_Palais_de_la_Porte_Dorée_-_Potamotrygon_leopoldi.jpg by KoS / CC BY-SA 3.0
7. fish7.jpg: https://commons.wikimedia.org/wiki/File:Astronotus_ocellatus.jpg by Jón Helgi Jónsson (Amything) / CC BY-SA 3.0
8. fish8.jpg: https://commons.wikimedia.org/wiki/File:Atlantischer_Lachs.jpg by Hartley, William W / public domain
9. fish9.jpg: https://commons.wikimedia.org/wiki/File:Cheilinus_undulatus_1.jpg by Stan Shebs / CC BY-SA 3.0
10. fish10.jpg: https://commons.wikimedia.org/wiki/File:Chelmon_rostratus_Kupferstreifen-Pinzettfisch.jpg by BS Turner Hof / CC BY-SA 3.0
11. fish11.jpg: https://commons.wikimedia.org/wiki/File:Chlamydoselachus_anguineus2.jpg by Citron / CC BY-SA 3.0
12. fish12.jpg: https://commons.wikimedia.org/wiki/File:Group_of_Pterophyllum_Altum.jpg by Jeff Kubina / CC BY-SA 2.0
13. fish13.jpg: https://lv.wikipedia.org/wiki/Att%C4%93ls:Guppy-male.jpg by Jdiemer / CC BY-SA 3.0
14. fish14.jpg: https://commons.wikimedia.org/wiki/File:Hammerhead_shark.jpg by suneko / CC BY 2.0
15. fish15.jpg: https://commons.wikimedia.org/wiki/File:Heterodontus_francisci_catalina_cropped.jpg by Ed Bierman / CC BY 2.0
16. fish16.jpg: https://incubator.wikimedia.org/wiki/File:Macropodus_opercularis_-_front_(aka).jpg by André Karwath / CC BY-SA 2.5
17. fish17.jpg: https://commons.wikimedia.org/wiki/File:Male_whale_shark_at_Georgia_Aquarium.jpg by Zac Wolf / CC BY-SA 2.5
18. fish18.jpg: https://commons.wikimedia.org/wiki/File:Pristiophorus_japonicus.jpg by OpenCago.info / CC BY-SA 2.5
19. fish19.jpg: https://commons.wikimedia.org/wiki/File:Raja_clavata_(BPNS).jpg by Hans Hillewaert / CC BY-SA 4.0
20. fish20.jpg: https://commons.wikimedia.org/wiki/File:Synchiropus_splendidus_2_Luc_Viatour.jpg by Luc Viatour / CC BY-SA 3.0
21. fish21.jpg: https://commons.wikimedia.org/wiki/File:White_shark.jpg by Terry Goss / CC BY-SA 3.0
22. fish22.jpg: https://commons.wikimedia.org/wiki/File:Georgia_Aquarium_-_Giant_Grouper_edit.jpg by Diliff / CC BY-SA 3.0
23. fish23.jpg: https://hr.wikipedia.org/wiki/Datoteka:Alligator_gar_fish.jpg by Duane Raver / public domain
24. fish24.jpg: https://commons.wikimedia.org/wiki/File:Common_carp.jpg by Duane Raver / public domain
25. fish25.jpg: https://commons.wikimedia.org/wiki/File:Goldfisch_1.jpg by Necrophorus / public domain
26. fish26.jpg: https://commons.wikimedia.org/wiki/File:Titan_Triggerfish_(or_Giant_Triggerfish,_or_Moustache_Triggerfish),_Balistoides_viridescens_feeding_at_Sataya_Reef,_Red_Sea,_Egypt_-SCUBA_(6395402117).jpg by Derek Keats / CC BY 2.0
27. fish27.jpg: https://commons.wikimedia.org/wiki/File:Squatina_squatina_tenerife2.jpg by Philippe Guillaume / CC BY 2.0
28. fish28.jpg: https://commons.wikimedia.org/wiki/File:Titan_Triggerfish_(or_Giant_Triggerfish,_or_Moustache_Triggerfish),_Balistoides_viridescens_lying_down_for_a_cleaning_at_Elphinstone_Reef,_Red_Sea,_Egypt_-SCUBA_(6194695879).jpg by Derek Keats / CC BY 2.0