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Slimehead behaviour is not well studied, but some species sporadically form dense aggregations. In the case of the orange roughy, these aggregations (possibly segregated according to sex) may reach a population density of 2.5/m 2;.
The orange roughy is the largest known slimehead species at a maximum standard length (a measurement that excludes the tail fin) of 75 cm (30 in) and a maximum weight of 7 kg (15 lb). The average commercial catch size is commonly between 35 and 45 centimetres (14 and 18 in) in length, again, varying by area.
The silver roughy or Mediterranean slimehead (Hoplostethus mediterraneus) is a small deep-sea fish species belonging to the slimehead family (Trachichthyidae). [1] It is recognized as a bony fish and is metallic with orange to red fins. [ 2 ]
Gephyroberyx darwinii, the big roughy or Darwin's slimehead, is a species of fish in the slimehead family found widely in the Atlantic and Indo-Pacific oceans. [2] This deep-sea species reaches a length of 60 cm (2.0 ft) and is mainly found at depths of 200 to 500 m (660–1,640 ft), but has been recorded between 9 and 1,210 m (30–3,970 ft). [2]
Hoplostethus cadenati Quéro, 1974 - black slimehead; Hoplostethus confinis Kotlyar, 1980; Hoplostethus crassispinus Kotlyar, 1980; Hoplostethus druzhinini Kotlyar, 1986; Hoplostethus fedorovi (Kotlyar, 1986) Hoplostethus fragilis (F. de Buen, 1959) - Chilean roughy; Hoplostethus gigas (McCulloch, 1914) - giant sawbelly
The smallscale slimehead (Hoplostethus melanopus) is a deepwater fish of the family Trachichthyidae. It lives on the continental shelf at a depths of 400–914 m (1,312–2,999 ft). It can reach sizes of up to 25.0 cm (9.8 in) TL .
The black slimehead (Hoplostethus cadenati) is a member of the order Beryciformes. It is found along the coast of northwest Africa from Cape Verde down to South Africa . It typically lives near the ocean floor 200–700 m (660–2,300 ft) deep, but can be found up ranging from 70–1,000 m (230–3,280 ft) deep.
Trachichthys australis, the southern roughy, is a species of slimehead and the only member of the genus Trachichthys. It is native to the waters off Australia, where it is found around coral reefs between 1 and 1,557 metres (3.3 and 5,108.3 ft) in depth. It can grow to a maximum length of 15.0 centimetres (5.9 in) SL. [2]