''Johnius'' is a genus of fishes in the family

Sciaenidae Sciaenidae are a family of fish in the order Acanthuriformes. They are commonly called drums or croakers in reference to the repetitive throbbing or drumming sounds they make. The family consists of about 286 to 298 species in about 66 to 70 gen ...

. They are commonly known as croakers due to their ability to produce purring, croaking and knocking sounds. The sounds are produced mainly at night and are thought to be either involved in defense or for courtship. The genus name was erected by Marcus Bloch in 1793 based on a specimen obtained from Tranquebar from Reverend

Christoph Samuel John Christoph Samuel John (11 August 1747 – 1 September 1813) was a German missionary in the service of the Danish-Halle Mission in southern India at the Danish settlement of Tranquebar (Tharangambadi). He promoted schools, natural theology, and coll ...

which was named as ''Johnius carutta''. There are about 35 species in the genus, all within the Indo-West Pacific waters. The genus and the tribe Johniini are identified by the hammer-shaped swim bladder with 13-17 branching lateral appendages, the first lateral branch extending to the dorsal corner of the gill opening. The have large paired sagittal otoliths that are triangular.

Species diversity

Species in the genus include: * '' Johnius amblycephalus'' (Bleeker, 1855) - Bearded croaker * '' Johnius australis'' (Günther, 1880) - Bottlenose jewfish * '' Johnius belangerii'' (Cuvier, 1830) - Belanger's croaker * '' Johnius borneensis'' (Bleeker, 1851) - Sharpnose hammer croaker * '' Johnius cantori'' Bleeker, 1874 * '' Johnius carouna'' (Cuvier, 1830) - Caroun croaker * '' Johnius carutta'' Bloch, 1793 - Karut croaker * '' Johnius coitor'' (Hamilton, 1822) - Coitor croaker * '' Johnius distinctus'' (Tanaka, 1916) * '' Johnius dorsalis'' (Peters, 1855) - Small kob * '' Johnius dussumieri'' (Cuvier, 1830) - Sin croaker * '' Johnius elongatus'' Lal Mohan, 1976 - Spindle croaker * '' Johnius fasciatus'' Chu, Lo & Wu, 1963 * '' Johnius fuscolineatus'' (von Bonde, 1923) - Bellfish * ''

Johnius gangeticus ''Johnius'' is a genus of fishes in the family Sciaenidae. They are commonly known as croakers due to their ability to produce purring, croaking and knocking sounds. The sounds are produced mainly at night and are thought to be either involved in ...

'' Talwar, 1991 * '' Johnius glaucus'' (Day, 1876) - Pale spotfin croaker * '' Johnius goldmani'' (Bleeker, 1855) * '' Johnius grypotus'' (Richardson, 1846) * '' Johnius heterolepis'' Bleeker, 1873 - Large-scale croaker * '' Johnius hypostoma'' (Bleeker, 1854) - Small-mouth croaker * ''

Johnius laevis ''Johnius'' is a genus of fishes in the family Sciaenidae. They are commonly known as croakers due to their ability to produce purring, croaking and knocking sounds. The sounds are produced mainly at night and are thought to be either involved in ...

'' Sasaki & Kailola, 1991 - Smooth croaker * ''

Johnius latifrons ''Johnius'' is a genus of fishes in the family Sciaenidae. They are commonly known as croakers due to their ability to produce purring, croaking and knocking sounds. The sounds are produced mainly at night and are thought to be either involved in ...

'' Sasaki, 1992 - Broad-head croaker * ''

Johnius macropterus ''Johnius'' is a genus of fishes in the family Sciaenidae. They are commonly known as croakers due to their ability to produce purring, croaking and knocking sounds. The sounds are produced mainly at night and are thought to be either involved in ...

'' (Bleeker, 1853) - Largefin croaker * ''

Johnius macrorhynus ''Johnius'' is a genus of fishes in the family Sciaenidae. They are commonly known as croakers due to their ability to produce purring, croaking and knocking sounds. The sounds are produced mainly at night and are thought to be either involved in ...

'' (Lal Mohan, 1976) - Big-snout croaker * ''

Johnius majan ''Johnius'' is a genus of fishes in the family Sciaenidae. They are commonly known as croakers due to their ability to produce purring, croaking and knocking sounds. The sounds are produced mainly at night and are thought to be either involved in ...

'' Iwatsuki, Jawad & Al-Mamry, 2012 - Majan croaker * ''

Johnius mannarensis ''Johnius'' is a genus of fishes in the family Sciaenidae. They are commonly known as croakers due to their ability to produce purring, croaking and knocking sounds. The sounds are produced mainly at night and are thought to be either involved in ...

'' Lal Mohan, 1971 - Mannar croaker * ''

Johnius novaeguineae ''Johnius'' is a genus of fishes in the family Sciaenidae. They are commonly known as croakers due to their ability to produce purring, croaking and knocking sounds. The sounds are produced mainly at night and are thought to be either involved in ...

'' (Nichols, 1950) - Paperhead croaker * ''

Johnius novaehollandiae ''Johnius'' is a genus of fishes in the family Sciaenidae. They are commonly known as croakers due to their ability to produce purring, croaking and knocking sounds. The sounds are produced mainly at night and are thought to be either involved in ...

'' (Steindachner, 1866) * '' Johnius pacificus'' Hardenberg, 1941 - Pacific croaker * '' Johnius philippinus'' Sasaki, 1999 * '' Johnius plagiostoma'' (Bleeker, 1849) - Large-eye croaker * '' Johnius trachycephalus'' (Bleeker, 1851) - Leaftail croaker * ''

Johnius trewavasae ''Johnius'' is a genus of fishes in the family Sciaenidae. They are commonly known as croakers due to their ability to produce purring, croaking and knocking sounds. The sounds are produced mainly at night and are thought to be either involved in ...

'' Sasaki, 1992 - Trewavas croaker * '' Johnius weberi'' Hardenberg, 1936 - Weber's croaker

References

{{taxonbar, from = Q149008 Sciaenidae Fish genera