Threatened to extinct fishes of Bangladesh:
The IUCN Bangladesh has made a list of threatened to extinct fishes of Bangladesh. These species are considered as threatened fishes of Bangladesh. The National Categories of Threatened Animals are based on the Global Threatened Categories of IUCN. Bangladesh National Criteria were developed on the basis of qualitative data due to the lack of quantitative ones.
The National Categories and Criteria are as follows-

Categories:
Critically Endangered (CR): A taxon is Critically Endangered when it is facing an extremely high risk of extinction in the wild in Bangladesh in the immediate future.

Endangered (EN): A taxon is Endangered when it is not Critically Endangered but is facing a very high risk of extinction in the wild in Bangladesh in the near future.

Vulnerable (VU): A taxon is Vulnerable when it is not Critically Endangered or Endangered but is facing a high risk of extinction in the wild in Bangladesh in the medium-term future.

Data Deficient (DD): A taxon is Data Deficient where there is inadequate information to make a direct, or indirect assessment of its risk of extinction in Bangladesh.

Not Threatened (NO): A taxon is Not Threatened when it is out of the four above-mentioned categories. i.e. which has no apparent threat of extinction in Bangladesh.

Literature cited:

IUCN Bangladesh (2000) Red book of threatened fishes of Bangladesh, IUCN- The world conservation union. xii+116 pp.