A total of 54 native freshwater fish species of Bangladesh have been declared threatened by IUCN Bangladesh (2000). Among them 12 species are recorded as critically endangered, 28 species are endangered and rest 14 species are vulnerable.
Out of 54 threatened freshwater fish species of Bangladesh, 27 species are found in Chalan Beel (5 species are critically endangered, 12 species are endangered and rest 10 species are vulnerable).
Critically endangered fish species (5) found in Chalan Beel are shown bellow-
Bangla Name: Bagair
English Name: Dwarf goonch, Gangetic goonch
Scientific Name: Bagarius bagarius
Bangla Name: Ghaira or Gang Ghaira
English Name: Garua Bachcha
Scientific Name: Clupisoma garua
Bangla Name: Bacha
English Name: Batchwa Bacha
Scientific Name: Eutropiichthys bacha
Bangla Name: Rita or Ritha or Eta
English Name: Rita
Scientific Name: Rita rita
Bangla Name: Deshi Sarpunti
English Name: Olive barb
Scientific Name: Puntius sarana
According to IUCN Bangladesh (2000), the meaning of critically endangered, endangered and vulnerable is given bellow-
A taxon is critically endangered when it is facing an extremely high risk of extinction in the wild in the immediate future.
A taxon is endangered when it is not critically endangered but is facing a very high risk of extinction in the wild in the near future.
A taxon is vulnerable when it is not critically endangered or endangered but is facing a high risk of extinction in the wild in the medium-term future.
IUCN Bangladesh. 2000. Red Book of Threatened Fishes of Bangladesh. IUCN- The World Conservation Union. xii+116 pp.
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