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Mastiglanis asopos Bockmann, 1994

Image contributors to this species:

Garold W. Sneegass (1) Steven Grant (2) Danté Fenolio (1)

ScotCat Sources:

Etymology = Genus

Other Sources:

Fishbase  Google Search  All Catfish Species Inventory Wikipedia


Relevant Information:

M. asopos is a strictly sand-dwelling species. It spends the daytime buried in the top layer of sand and it forages mostly at night and sometimes in the morning. As an ambush predator, when foraging, it poises in the streamlet channel where water is flowing, supported by a tripod formed by its pelvic and anal fins, spreading both its very long barbels and the filamentous dorsal and pectoral-fin rays, thus forming a kind of "drift-trap". When the fish intercepts food, it will lunge at these food particles; after lunging for a short distance, it will return to its previous hunting spot. This behavior is similar to that seen in the tripod fish. Small trichopteran larvae (ingested with the sand cases) and ephemeropterans constituted a considerable portion of the gut contents in a study of Mastiglanis asopos, but their foraging behavior allows a varied diet which includes large chironomid larvae and small adult beetles that would not be consumed by other sand-dwelling animals. This fish has long barbels and long first pectoral fin rays which are used for feeding. It also has an acuminate (tapered to a point) snout.

Common Name:







South America: Amazon, Capim and Orinoco River basins. Type locality: Brazil, Pará, Igarapé Saracazinho, tributary of rio
Trombetas, near Porto Trombetas.


6.5cm. (2¾ins)


23-25°C (73-77°F)




Ferraris, C.J. Jr., 2007. Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types. Zootaxa 1418:1-628.
Zuanon, Jansen; Bockmann, Flávio A.; Sazima, Ivan (2006). "A remarkable sand-dwelling fish assemblage from central Amazonia, with comments on the evolution of psammophily in South American freshwater fishes". Neotropical Ichthyology 4 (1): 107–118.



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