|Nine genera and 36 described species are known from Australian waters. More than half the Australian species live in freshwater.|
|Primarily marine pelagic fishes found in tropical and temperate coastal waters and estuaries. Freshwater species are known from Australia, Papua New Guinea and Irian Jaya, and particularly South America, where an extensive radiation has taken place.|
|Hardyheads are mostly small, elongate silvery fishes with small, usually cycloid scales, no lateral line, and usually a small mouth. The two dorsal fins are widely separated.|
|To 60 cm, although most are less than 20 cm.|
|Hardyheads are counter-shaded, and are usually a darker bluish or greenish above and whitish below, with a silvery midlateral stripe.|
|Feed mostly on planktonic invertebrates.|
|The sexes are separate and fertilisation is external.|
|Some species are of minor commercial importance in other parts of the world. Atherinids are also used as bait by recreational fishers.|
|Fossil atherinids are known from the beginning of the Eocene Epoch - 56 million years ago.|
|Bray, D.J. 2017|
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