Salmonidae is a family of ray-finned fish that constitutes the only currently extant family in the order Salmoniformes, consisting of 11 extant genera and over 200 species collectively known as "salmonids" or "salmonoids". The family includes salmon, trout, char, graylings, freshwater whitefishes, taimens and lenoks, all coldwater mid-level predatory fish that inhabit the subarctic and cool temperate waters of the Northern Hemisphere. The Atlantic salmon, whose Latin name became that of its genus Salmo, is also the eponym of the family and order names.
Slickheads, also known as nakedheads or smoothheads, are deep water fishes that belong to the family Alepocephalidae. They are most commonly found in the bathypelagic layer, which is approximately 3000m below the surface. They get their name from the lack of scales on their heads. Similarly, the scientific name is from the Greek ᾰ̓- (a-, "not"); λέπος (lepos, "scale"); and κεφαλή (kephalē, "head"). It has about 22 genera with ca. 96 species.
Trichonotus is a genus of marine gobiiform fishes. Species of Trichonotus are distributed throughout the Indo-West Pacific. This genus is the only member of the family Trichonotidae.
Bajacalifornia is a genus of slickheads. It was described in 1925 by Charles Haskins Townsend and John Treadwell Nichols on the basis of Bajacalifornia burragei which was discovered in 1911 during the deep sea expedition of the research vessel USS Albatross off the coast of Todos Santos Bay at the Baja California peninsula. In 1952 Ichthyologist Albert Eide Parr published a revision of this genus.
Alepocephalus is a genus of slickheads found in all oceans.
Bathytroctes is a genus of slickheads that occur in the depths of the oceans.
Conocara is a genus of slickheads found in the deep waters of the oceans.
Einara is a small genus of slickheads found in the deep waters of the oceans. They can grow to 22 cm (8.7 in) standard length
Leptoderma is a genus of slickheads found in the deep waters of the oceans.
Rouleina is a genus of slickheads. The genus is named for the ichthyologist Louis Roule.
Talismania is a genus of slickheads.
Stomias is a genus of barbeled dragonfishes. They live in the mesopelagic zone of all oceans and show diel vertical migration and sexual dimorphism (males are smaller, have larger eyes and larger postorbital photophores than females.
Benthosema is a genus of lanternfishes.
Dicrolene is a genus of cusk-eels.
Holcomycteronus is a genus of cusk-eels. It includes Holcomycteronus profundissimus, long thought to be the deepest-living fish in the world's oceans.
Porogadus is a genus of cusk-eels.
Osedax japonicus is a species of bathypelagic polychaete tube worm that lives at great depths on the seabed and is able to sustain itself on the bones of a dead whale. It was first described in 2006 from a sunken sperm whale carcase near Kyushu, Japan.
Alepocephaliformes is an order of marine deep-sea teleost fishes. It was previously classified as the suborder Alepocephaloidei of the order Argentiniformes.
Narcetes shonanmaruae, the yokozuna slickhead, is a species of large marine ray-finned fish, a slickhead belonging to the family Alepocephalidae. At over 2.5 metres (8.2 ft) in length, it is the largest species of slickhead, and the largest species of bony fish entirely restricted to the deep ocean.
Narcetes stomias, the blackhead salmon, is a species of fish in the family Alepocephalidae (slickheads).
