Fish Species

Red Tailed Catfish

Red Tailed Catfish - Description

The Red Tailed Catfish (Phractocephalus hemioliopterus) is also known as a Cajaro in Venezuela.

It is a very popular fresh water aquarium fish that originates from South America. They can grow to over 1m in length,  something to consider when purchasing a juvenile!

It is a long-whiskered (pimelodid) species and can be recognised by its red or orange tipped caudal fin. The red tailed catfish is not recommended for the home aquarium due to its size, it is best suited to public aquariums with large tanks.

Profile of the Red Tailed Catfish

This Profile contains interesting facts and information about the Red Tailed Catfish species.

  • Size: Up to 130cm

  • Fish Tank conditions: PH 5.5 to 6.8. Temp 20 to 26 Degrees

  • Diet / Feeding: Fish, Crustaceans, Cockles, Mussels

  • Temperament: Territorial, only a single species should be kept

  • Habitat: Freshwater River Basins

  • Behaviour: Peaceful as long as kept with similar sized fish

  • Range: Amazon and Orinoco river basins including Venezuela, Columbia, Brazil, Guyana, Bolivia, Ecuador

Scientific Classification of the Red Tailed Catfish

Definition: Scientific classification, or biological classification, is how biologists group and categorize species of organisms with shared physical characteristics. Scientific classification belongs to the science of taxonomy.

  • Species: Phractocephalus hemioliopterus

  • Popular Name: Red Tail Catfish - Cajaro

  • Kingdom: Animalia

  • Phylum: Chordata

  • Class: Actinopterygii

  • Order: Siluroformes

  • Family: Pimelodidae


Aquarium Fish Index

Facts about Fish Species - Red Tailed Catfish

The colours, shapes and sizes of individual fishes varies enormously - you really need excellent quality pictures or photographs to assist in the identification process.


A combination of the number of fins and their characteristics, color, scale counts, general features, maximum length and distribution are used during a species identification process.

The species detailed on this website are Tropical, Saltwater, Aquarium , Marine , Pet , Pond, Clown, Koi,
Beta (Betta), Gold Fish (Goldfish), Star, Angel, Puffer, Discus, Piranha, Rainbow, Parrot, Crustaceans, Sea Anemones and Coral.

For more information and pictures of the Red Tailed Catfish visit the
Full Fish Species Website

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