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#1. Red Handfish 
Thymichthys politus
Fewer than 100 adults left, living on two tiny reefs in Tasmania. It walks instead of swimming!!
pic: Mark Green/CSIRO Marine Research, CSIRO / CC BY 3.0 |
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#2. Coelacanth
Latimeria chalumnae
Scientists thought it died out with the dinosaurs. Then one turned up in a South African fishing net in 1938.
pic: Bruce A.S. Henderson / CC BY 4.0 |
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#3. Devils Hole Pupfish
Cyprinodon diabolis
The whole species lives in ONE water-filled cave in Nevada. In 2013 there were only 35 left.
pic: Olin Feuerbacher / USFWS / Public domain |
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#4. Goblin Shark
Mitsukurina owstoni
Deep-sea shark whose jaws shoot out of its face to grab food.
pic: Michigan State University/USFWS / Public domain |
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#5. Frilled Shark
Chlamydoselachus anguineus
Eel-shaped shark with about 300 trident-shaped teeth. Hardly ever seen alive.
pic: Robert Mintern / Public domain |
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#6. Giant Oarfish
Regalecus glesne
Longest bony fish in the world, up to 8 metres. In Japanese folklore they surface before earthquakes.
pic: Sandstein / CC BY 3.0 |
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#7. Leafy Seadragon
Phycodurus eques
Only found off southern and western Australia. Disguises itself as seaweed.
pic: James Rosindell / CC BY-SA 4.0 |
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#8. Psychedelic Frogfish 
Histiophryne psychedelica
Not described by science until 2009. Bounces along the seafloor like a rubber ball.
pic: David Hall / seaphotos.com / CC BY-SA 3.0 |
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#9. Largetooth Sawfish
Pristis pristis
Critically endangered. Hunts by swinging a saw lined with teeth.
pic: J. Patrick Fischer / CC BY-SA 3.0 |
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#10. Mekong Giant Catfish
Pangasianodon gigas
One caught in Thailand in 2005 weighed 293 kg. Critically endangered.
pic: KKPCW / CC BY-SA 4.0 |
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#11. Australian Lungfish
Neoceratodus forsteri
Breathes air. One named Granddad lived at a Chicago aquarium from 1933 until 2017.
pic: Mitch Ames / CC BY-SA 4.0 |
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#12. Megamouth Shark
Megachasma pelagios
Unknown to science until 1976. Only a few hundred have ever been recorded. (pic is a museum model)
pic: opencage / CC BY-SA 2.5 |
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#13. Spotted Handfish
Brachionichthys hirsutus
Another Tasmanian handfish. Uses its fins like little hands to walk across the sand.
pic: Barry Bruce, CSIRO / CC BY 3.0 |
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#14. Blobfish
Psychrolutes marcidus
Voted ugliest animal in the world in 2013. It only goes blobby when it is dragged up from the deep. (old drawing)
pic: Alan Riverstone McCulloch (1885-1925) / Public domain |
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#15. Barreleye
Macropinna microstoma
Has a see-through head. Its eyes look up through it.
pic: Unknown authorUnknown author / Public domain |
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#16. Asian Arowana
Scleropages formosus
Kept as a lucky "dragon fish". Prize ones sell for thousands.
pic: Marcel Burkhard / CC BY-SA 3.0 |
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#17. Weedy Seadragon
Phyllopteryx taeniolatus
Aussie legend. The dad carries the eggs on his tail.
pic: Richard Ling <wikipedia@rling.com> -->Rling / CC BY-SA 3.0 |