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Jump to next section Cat-eLog Data Sheet
Scientific NameSilurus asotus  Linnaeus, 1758
Common NamesNamazu
Amurmalle (Denmark), Chinese Catfish, Japanese Catfish
Type LocalityAsia.
Synonym(s)Parasilurus asotus, Parasilurus japonicus, Silurus bedfordi, Silurus cinereus, Silurus dahuricus, Silurus japonicus, Silurus punctatus
PronunciationSee loo russ - ass ott us
EtymologyFrom the Greek silouros which is the name of the fish. 
Jump to next section Species Information
Size 1000mm or 39.4" SL. Find near, nearer or same sized spp.
IdentificationElongated, cylindrical body. 2 pairs of barbels (mandibular and maxillary). Small dorsal fin, anal fin connected with caudal fin. Dark brown to greenish yellow-brown back, light yellow to yellowish white belly. Average adult size is around 300~500mm. Fry have a second pair of mandibular barbels that fall off spontaneously when the fish reach a length of 60-70 mm TL.
General RemarksAn important food fish. Can often be seen in holding tanks in restaurants in China. Also used in Chinese medicine.
Just as Siluris glanis was the prototypical catfish in early Western civilization, S. asotus was the prototypical catfish in early Chinese civilization. Its original Chinese name "Nian", is now the root of the term ("Nianke") for the order Siluriformes and of the common name ("Nianyu") for all catfish.
Jump to next section Habitat Information
DistributionChina, Taiwan, Japan, Korea, Mongolia and Russian Far East.
China Waters (click on these areas to find other species found there)
Japan Waters (click on these areas to find other species found there)
Taiwan Waters (click on these areas to find other species found there)
Mongolia Waters (click on these areas to find other species found there)
Korea Waters (click on these areas to find other species found there)
Show it on a map (Click the map-icon to show/hide map of species distribution)
IUCN Red List StatusLeast Concern
pH6.0 - 8.0
Temperature5.0-26.0°C or 41-78.8°F (Show species within this range)
Other ParametersA hardy fish that can survive and thrive in a wide variety of water conditions, notably including wide variations in temperature.
Jump to next section Husbandry Information
FeedingCarnivore. In the wild, eats smaller fish, crustaceans and insects.
CompatibilityNot recommended as an aquarium fish due to its large adult size and propensity to eat other fish.
BreedingSexually mature at two years. Spawns in May through July. Eggs are slightly sticky, yellowish green or green and spherical in shape, measuring 1.1 - 1.2 mm in diameter.
Jump to next section Further Information
ReferencesSystema Nat. ed. 10v. 1 - pp304
Registered Keepers(1) Silurus, (2) cochito, (3) EmpowerMaui (k: 3).

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Breeding ReportsNone.
Article - CotM 2005 January
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Last Update2013 Jul 19 00:00 (species record created: 2001 Apr 21 00:00)