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Down Cat-eLog Data Sheet
Scientific Name Pterodoras granulosus  (Valenciennes, 1821)
Common Names Granulated Catfish
Armado (Venezuelan), Bacu (Brazilian), Common Bacu, Ru Tornmalle (Denmark)
Type Locality South America.
Synonym(s) Doras granulosus
Pronunciation gran you LOW sus
Etymology Pterodoras: From the Greek pteron, meaning fin, and doras, meaning skin (also a word commonly used in forming generic names for doradids); in reference to the forked caudal fin. 
Article Link - CotM Right 2002 Right September
Down Species Information
Size 700mm or 27.6" SL. Find near, nearer or same sized spp.
Identification The colour pattern of these catfish varies depending upon the location that they originate from. These fish are usually a muddy-brown colour with some darker spots over the body and fins. As these fish mature the spotting tends to fade. Juvenile specimens tend not to be as dark coloured as adult fish,
Sexing There are no reported external sexual differences. Personal observation shows that females tend to be more heavily built/robust than the males, which tend to be slender. There may also be differences associated with the structure of the head as with the Synodontis catfish, but further observations need to be made.
Down Habitat Information
Distribution South America: Amazon and Paraná River basins and coastal drainages in Guyana and Suriname.
Amazon (click on these areas to find other species found there)
La Plata, Paran√° (click on these areas to find other species found there)
La Plata, Uruguay, Lower Uruguay (click on these areas to find other species found there)

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IUCN Red List Category Not Evaluated
pH 6.4 - 7.6
Temperature 20.0-24.0°C or 68-75.2°F (Show species within this range)
Other Parameters Wamer water will be tolerated at least for a period of time. It is documented that keeping these fish in water with a pH value above 7.5 can cause skin and eye cloudiness.
Down Husbandry Information
Feeding Omnivore feeding on a very mixed and varied diet including catfish pellets, earthworms, whole prawns, mussels, floating sticks/pellets and snails. In their natural environment they would feed upon snails, aquatic plants and fruits.
See also natural feeding behaviour paper in the references section. User data.
Furniture Large pieces of bogwood are ideal. Large diameter pipe can be used but it should be large enough for the catfish to easily fit in without becoming stuck. I have managed to create two shady areas within my tropical pond, by covering the ends with decking, where these catfish prefer to hide until feeding time.
Compatibility Ideally suited to life with other large fish. These catfish are not predatory but would mistakenly take a smaller fish if hungry.
Suggested Tankmates Other large catfish such as Leiarius, Megalodoras, Oscars and larger characins.
Breeding There are no known aquarium spawnings of this catfish. This is most likely due to the size that these fish can attain and hence the subsequent size of aquarium in which to spawn them.
Breeding Reports There is no breeding report.
Down Further Information
Reference Voyage de Humboldt et Bonpland v. 2 (Title page 1833), pp 184.
Registered Keepers There are 27 registered keepers, view all "my cats" data.
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There are 13 records of this fish being seen, view them all.
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Last Update 2020 Sep 19 01:40 (species record created: 2001 May 04 00:00)