Moapa Dace
about 450 – 460 are living, they live in Muddy River, formerly at Moapa River at Nevada USA. Size of Range of 16 km. The Scientific Name is Moapa coriacea and they are critically endangered
Conasauga Logperch
Estimated numbers, they are fewer than 200. They are located at Conasauga River in Georgia and Tennessee, USA. The size of range 45km and Critically Endangered.
Devils Hole Pupfish
The estimated numbers is about 187. They are located at Devils Hole, Ash Meadows, Death Valley National Park, Nevada, USA. The size of range, Unspecified small cave lake (smallest geographic range on any vertebrate). The scientific name is Cyprinodon diabolis and they are critically endangered.
Futuna’s Emperor
Estimated numbers, only about 20 has observed on 2011. They located at Island of Futuna, Wallis and Futuna. Size of range of 5km. The scientific name is Akihito futuna and critically endangered.
Diamond Darter
Only only 19 specimens caught in the past 30 years. Living at Elk River, West Virginia, USA. Size of range about 22km. Scientific name Crystallaria cincotta and Critically Endangered.
Alabama Sturgeon
possibly extinct in the wild; only six specimens caught since 1997. Located at lower Alabama River, Alabama, USA. Size of range is about 216km. Scientific name of Scaphirhynchus suttkusi and Critically Endangered.
Damba Mipentina
No specimens have were seen during the most recent surveys in 2011; small number bred in captivity. Range location of Betsiboka and Mahajamba river basins in northwestern Madagascar. Size of range of 100 km. Scientific name of Paretroplus maculatus and Critically Endangered.
Chinese Paddlefish
They are possibly extinct in the wild; none have been seen since 2007. Range location at Yangtze River, China. The scientific name of Psephurus gladius and Critically Endangered.
Indeed, it's so rare to the extent that I really dont know these fishes hahaha.