List of data deficient fishes

•   Extinct in the wild (EW): 6 species
•   Critically endangered (CR): 455 species
•   Endangered (EN): 643 species
•   Vulnerable (VU): 1,245 species
•   Near threatened (NT, LR/cd): 548 species
•   Least concern (LC): 9,131 species
•   Data deficient (DD): 3,191 species

Fish species (IUCN, 2016-2)

• 15,219 extant species have been evaluated
• 12,028 of those are fully assessed^[a]
• 9679 are not threatened at present^[b]
• 2343 to 5534 are threatened^[c]
• 71 to 158 are extinct or extinct in the wild:
  • 65 extinct (EX) species^[d]
  • 6 extinct in the wild (EW)
  • 87 possibly extinct [CR(PE)]
  • 0 possibly extinct in the wild [CR(PEW)]

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1. ^ excludes data deficient evaluations.
2. ^ NT, LR/cd, LC.
3. ^ Threatened comprises CR, EN and VU. Upper estimate additionally includes DD.
4. ^ Chart omits extinct (EX) species

In September 2016, the International Union for Conservation of Nature (IUCN) listed 3191 data deficient fish species.^[1] A data deficient species is one which has been categorized by the IUCN as offering insufficient information for a proper assessment of conservation status to be made. Of all evaluated fish species, 21% are listed as data deficient. The IUCN also lists 12 fish subspecies as data deficient.

Of the subpopulations of fishes evaluated by the IUCN, 34 species subpopulations have been assessed as data deficient.

This is a complete list of data deficient fish species and subspecies evaluated by the IUCN. Species and subspecies which have data deficient subpopulations (or stocks) are indicated.