List of data deficient fishes

In September 2016, the International Union for Conservation of Nature (IUCN) listed 3191 data deficient fish species. 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.

Cartilaginous fishes
Chondrichthyes includes sharks, rays, skates, and sawfish. There are 475 species and three subpopulations of cartilaginous fish evaluated as data deficient.

Rays and skates
There are 253 species and one subpopulation in the order Rajiformes evaluated as data deficient.

Narcinids
Species

Subpopulations
 * Apron ray (Discopyge tschudii) (1 subpopulation)

Ground sharks
There are 110 species and one subpopulation of ground shark evaluated as data deficient.

Hammerhead sharks

 * Scoophead (Sphyrna media)

Requiem sharks
Species

Subpopulations
 * Night shark (Carcharhinus signatus) (1 subpopulation)

Squaliformes
There are 67 species and one subpopulation in the order Squaliformes evaluated as data deficient.

Centrophorids
Species

Subpopulations
 * Gulper shark (Centrophorus granulosus) (1 subpopulation)

Echinorhinids

 * Bramble shark (Echinorhinus brucus)

Chimaeras
There are 20 Chimaera species evaluated as data deficient.

Ray-finned fishes
There are 2682 species, 12 subspecies, and one subpopulation of ray-finned fish evaluated as data deficient.

Salmoniformes
Species

Subspecies Subpopulations
 * Coregonus sardinella baunti
 * Sockeye salmon (Oncorhynchus nerka) (31 subpopulations)

Toothcarps
There are 75 species and two subspecies of toothcarp evaluated as data deficient.

Nothobranchiids
Species

Subspecies
 * Aphyosemion cameronense haasi
 * Aphyosemion celiae winifredae

Cypriniformes
Cypriniformes includes carps, minnows, loaches and relatives. There are 610 species and two subspecies in the order Cypriniformes evaluated as data deficient.

Cyprinids
Species

Subspecies
 * Osteobrama cotio peninsularis
 * Rhodeus atremius suigensis

Catfishes
There are 439 catfish species evaluated as data deficient.

Perciformes
There are 786 species and two subspecies in the order Perciformes evaluated as data deficient.

Cichlids
Species

Subspecies
 * Cichlasoma urophthalmum ericymba
 * Pseudocrenilabrus multicolor multicolor

Osteoglossiformes
There are 40 species in the order Osteoglossiformes evaluated as data deficient.

Arapaimids

 * Arapaima (Arapaima gigas)

Characiformes
There are 110 species in the order Characiformes evaluated as data deficient.

Syngnathiformes
Syngnathiformes includes the pipefishes and seahorses. There are 71 species and two subspecies in the order Syngnathiformes evaluated as data deficient.

Syngnathids
Species

Subspecies
 * Subtropical-tropical trunk-pouch pipefish (Microphis brachyurus aculeatus)
 * Opossum river pipefish (Microphis brachyurus lineatus)

Scorpaeniformes
There are 57 species and one subspecies in the order Scorpaeniformes evaluated as data deficient.

Other Scorpaeniformes
Species

Subspecies
 * Spiny scorpionfish (Trachyscorpia cristulata echinata)

Tetraodontiformes
There are 36 species in the order Tetraodontiformes evaluated as data deficient.

Ostraciids

 * Island cowfish (Acanthostracion notacanthus)

Porcupinefish species

 * Deepwater burrfish (Allomycterus pilatus)

Triggerfishes

 * Deepwater triggerfish (Rhinecanthus abyssus)

Gadiformes
There are 32 species in the order Gadiformes evaluated as data deficient.

Merlucciids

 * Merluccius gayi
 * Cortez hake (Merluccius hernandezi)

Lotids

 * Azores rockling (Gaidropsarus granti)
 * Gaidropsarus guttatus

Bichirs

 * Polypterus teugelsi

Eels
There are 50 eel species evaluated as data deficient.

Flatfishes
There are 58 species and two subspecies of flatfish evaluated as data deficient.

Paralichthyids
Species

Subspecies
 * Etropus delsmani delsmani
 * Etropus delsmani pacificus

Zeiformes

 * Smooth oreo (Pseudocyttus maculatus)
 * John Dory (Zeus faber)