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.
Chondrichthyes includes sharks, rays, skates, and sawfish. There are 475 species and three subpopulations of cartilaginous fish evaluated as data deficient.
There are 253 species and one subpopulation in the order Rajiformes evaluated as data deficient.
SpeciesSubpopulations
There are 110 species and one subpopulation of ground shark evaluated as data deficient.
SpeciesSubpopulations
There are 67 species and one subpopulation in the order Squaliformes evaluated as data deficient.
SpeciesSubpopulations
There are 20 Chimaera species evaluated as data deficient.
There are 2682 species, 12 subspecies, and one subpopulation of ray-finned fish evaluated as data deficient.
SpeciesSubspecies
Subpopulations
There are 75 species and two subspecies of toothcarp evaluated as data deficient.
SpeciesSubspecies
Cypriniformes includes carps, minnows, loaches and relatives. There are 610 species and two subspecies in the order Cypriniformes evaluated as data deficient.
SpeciesSubspecies
There are 439 catfish species evaluated as data deficient.
There are 786 species and two subspecies in the order Perciformes evaluated as data deficient.
SpeciesSubspecies
There are 40 species in the order Osteoglossiformes evaluated as data deficient.
There are 110 species in the order Characiformes evaluated as data deficient.
Syngnathiformes includes the pipefishes and seahorses. There are 71 species and two subspecies in the order Syngnathiformes evaluated as data deficient.
SpeciesSubspecies
There are 57 species and one subspecies in the order Scorpaeniformes evaluated as data deficient.
SpeciesSubspecies
There are 36 species in the order Tetraodontiformes evaluated as data deficient.
There are 32 species in the order Gadiformes evaluated as data deficient.
There are 50 eel species evaluated as data deficient.
There are 58 species and two subspecies of flatfish evaluated as data deficient.
SpeciesSubspecies