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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.
Only the economically important species have had their reproduction studied in any detail; the larvae and juveniles of Darwin's slimehead are pelagic and frequent rather shallow waters near the coast, whereas in orange roughy, the early life stages are apparently confined to deeper water (around 200 m). Slimeheads are very slow-growing and long ...
Species. There are 30 species in this genus: [1] Hoplostethus abramovi Kotlyar, 1986. Hoplostethus atlanticus (Collett, 1889) - orange roughy. Hoplostethus cadenati Quéro, 1974 - black slimehead. Hoplostethus confinis Kotlyar, 1980. Hoplostethus crassispinus Kotlyar, 1980. Hoplostethus druzhinini Kotlyar, 1986.
The orange roughy, for example, can live up to 149 years, but takes anywhere from 23 to 40 years to begin reproducing. [7] [8] Despite these risks, most of the species that have been evaluated by the International Union for Conservation of Nature (IUCN) are listed as Least Concern or Data Deficient; only a few are classified as Vulnerable.
Escolar. The escolar, Lepidocybium flavobrunneum, a species of fish in the family Gempylidae, is found in deep (200–885 metres, or 656–2,904 ft) tropical and temperate waters around the world. It is also known as snake mackerel, walu walu (Hawaiian, sometimes written waloo), and is sometimes sold as "butterfish" or "white tuna". [2]
An example of errors in estimating the population dynamics of a species occurred within the New Zealand Orange roughy fishery. Early quotas were based on an assumption that the orange roughy had a fairly short lifespan and bred relatively quickly. However, it was later discovered that the orange roughy lived a long time and had bred slowly (~30 ...
Gwen Fenton was the Chief Scientist of the Australian Antarctic Division and is the first woman to hold this position. [1] [2] She discovered that the fish species Hoplostethus atlanticus can live to over 100 years old, leading to significant changes to the management of the species. [1] [3]
Orange roughy: The orange roughy may be the longest lived commercial fish, ... This species is among the longest-living species found in freshwater, with a reported ...