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).
Endangered fish species (12) found in Chalan Beel are shown bellow-
01.
Bangla Name: Madhu Pabda
English Name: Pabdah catfish
Scientific Name: Ompok pabda
![Madhu Pabda, Pabdah catfish, Ompok pabda Madhu Pabda, Pabdah catfish, Ompok pabda](https://en.bdfish.org/wp-content/uploads/2011/01/ompok-pabda.jpg)
02.
Bangla Name: Kani Pabda
English Name: Butter catfish
Scientific Name: Ompok bimaculatus
![Kani Pabda, Butter catfish, Ompok bimaculatus Kani Pabda, Butter catfish, Ompok bimaculatus](https://en.bdfish.org/wp-content/uploads/2011/01/ompok-bimaculatus-2.jpg)
03.
Bangla Name: Guizza or Guizza Ayre
English Name: Giant-river Catfish
Scientific Name: Sperata seenghala
![Guizza or Guizza Ayre, Giant-river Catfish, Sperata seenghala Guizza or Guizza Ayre, Giant-river Catfish, Sperata seenghala](https://en.bdfish.org/wp-content/uploads/2011/01/sperata-seenghala.jpg)
04.
Bangla Name: Chaka or Gangeni
English Name: Squarehead catfish
Scientific Name: Chaca chaca
![Chaka or Gangenia, Squarehead catfish, Chaca chaca Chaka or Gangenia, Squarehead catfish, Chaca chaca](https://en.bdfish.org/wp-content/uploads/2011/01/chaca-chaca.jpg)
05.
Bangla Name: Gazar
English Name: Great snakehead
Scientific Name: Channa marulius
![Gazar, Great snakehead, Channa marulius Gazar, Great snakehead, Channa marulius](https://en.bdfish.org/wp-content/uploads/2011/01/channa-marulius.jpg)
06.
Bangla Name: Chital
English Name: Clown Knifefish
Scientific Name: Notopterus chitala
![Chital, Clown Knifefish, Notopterus chitala Chital, Clown Knifefish, Notopterus chitala](https://en.bdfish.org/wp-content/uploads/2011/01/notopterus-chitala.jpg)
07.
Bangla Name: Calbaus
English Name: Orange-fin Labeo
Scientific Name: Labeo calbasu
![Calbaus, Orange-fin Labeo, Labeo calbasu Calbaus, Orange-fin Labeo, Labeo calbasu](https://en.bdfish.org/wp-content/uploads/2011/01/labeo-calbasu.jpg)
08.
Bangla Name: Bata
English Name: Bata
Scientific Name: Labeo bata
![Bata, Bata, Labeo bata Bata, Bata, Labeo bata](https://en.bdfish.org/wp-content/uploads/2011/01/labeo-bata.jpg)
09.
Bangla Name: Dhela
English Name: Cotio
Scientific Name: Rohtee cotio
![Dhela, Cotio, Rohtee cotio Dhela, Cotio, Rohtee cotio](https://en.bdfish.org/wp-content/uploads/2011/01/rohtee-cotio.jpg)
10.
Bangla Name: Baim
English Name: Zig-zag eel
Scientific Name: Mastacembelus armatus
![Baim, Zig-zag eel, Mastacembelus armatus Baim, Zig-zag eel, Mastacembelus armatus](https://en.bdfish.org/wp-content/uploads/2011/01/mastacembelus-armatus.jpg)
11.
Bangla Name: Bou or Rani
English Name: Bengal Loach
Scientific Name: Botia dario
![Bou or Rani, Bengal Loach, Botia dario Bou or Rani, Bengal Loach, Botia dario](https://en.bdfish.org/wp-content/uploads/2011/01/botia-dario-2.jpg)
12.
Bangla Name: Bou or Rani
English Name: Reticulate Loach
Scientific Name: Botia lohachata
![Bou or Rani, Reticulate Loach, Botia lohachata Bou or Rani, Reticulate Loach, Botia lohachata](https://en.bdfish.org/wp-content/uploads/2011/01/botia-lohachata-2.jpg)
Note:
According to IUCN Bangladesh (2000), the meaning of critically endangered, endangered and vulnerable is given bellow-
Critically Endangered:
A taxon is critically endangered when it is facing an extremely high risk of extinction in the wild in the immediate future.
Endangered:
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.
Vulnerable:
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.
Reference:
IUCN Bangladesh. 2000. Red Book of Threatened Fishes of Bangladesh. IUCN- The World Conservation Union. xii+116 pp.
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