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Acanthodoras

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Contents of this page belong to www.fishlookup.com Acanthodoras is a genus of catfishes (order Siluriformes) of the family Doradidae. It includes three species, A. cataphractus, A. depressus, and A. spinosissimus.[1]

Acanthodoras species are distributed in South America. A. cataphractus is found in the Amazon River basin and coastal drainages of French Guiana, Guyana, and Suriname.[2] A. depressus inhabits the Amazon and Rio Negro basins.[3] A. spinosissimus originates from the Amazon and Essequibo River basins.[4]

These catfish lack scales, but their bodies are armored with a lateral row of bony plates. The head is large and flattened. The mouth is terminal (points straight forward). There are three pairs of barbels and the eyes are small.[2] There are no external sexual characteristics.[5] The dorsal and pectoral fin spines are stiff and sharp and can inflict a painful wound.

A. cataphractus reaches a length of 11.5 centimetres (4.52 in) SL.[2] A. depressus grows up to 8.1 cm (3.2 in) SL.[3] A. spinosissimus has a maximum size of 13.7 cm (5.4 in) SL.[4]

A. cataphractus is abundant in calm waters of swamps and mangroves. Omnivorous, they feed mainly on organic wastes; these fish search for food by digging in the sediment. These fish are nocturnal; during the day, this species lies hidden in the underwater roots and stocks. A. cataphractus is able to produce sounds; every basic unit of the sound they emit when they move their pectoral spine lasts 100-200 milliseconds and has a frequency of 170-250 Hertz.[2]

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