Ageneiosus inermis (Linnaeus, 1766)

Manduba

Catalog of Fishes (gen., sp.) | ITIS | CoL

Classification	Actinopterygii \| Siluriformes \| Auchenipteridae \| Auchenipterinae
Synonyms	Silurus inermis, Ageneiosus armatus, Ageneiosus axillaris, ... more
Common names	Catfish, Haplochromis quads, Manduví, ... more

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Picture by Magalhães, K.

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Main reference

Ferraris, C.J. Jr. 2003. (Ref. 37098)
Other references | Biblio | Coordinator : Ferraris, Jr., Carl J. | Collaborators

Size / Weight / Age

Max length : 59.0 cm TL male/unsexed; (Ref. 40637); max. published weight: 2,500 g (Ref. 6869)

Environment

Pelagic; freshwater; pH range: 6.5 - 7.8; dH range: ? - 20

Climate / Range

Tropical; 22°C - 24°C (Ref. 2060)

South America: Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Suriname, and Venezuela.
Countries | FAO areas | Ecosystems | Occurrences | Introductions

Short description

Anal soft rays: 34 - 40; Vertebrae: 46 - 51. Body naked and elongated. Head is pointed and depressed at the top. Mouth is big and wide. The lateral eyes are situated along the level of the mouth, ensuring a vision above and below. Exhibits sexual dimorphism, like A. dentatus. The first ray of the dorsal fin is very long and has pointed spines (Ref. 35381).

Prefers rivers in overgrown backwaters where the current is not too strong. Feeds on fish and crustaceans. Its flesh is esteemed for its very fine flavor. Is reported to be nocturnal. Frequently captured with nets, the males are difficult to release from the nets because of its strong dorsal spine bordered with denticles (Ref. 27188). During reproduction, the mandibular barbels and dorsal spine of the male change, and a copulatory organ appears at the anterior level of the anal fin. Fertilization is internal, the female being capable of keeping the spermatozoids inserted in the epithelium of her genital tract (Ref. 35381).


IUCN Red List Status (Ref. 57073)	Threat to humans
Not Evaluated	Harmless

Human uses
Fisheries: commercial; gamefish: yes; aquarium: public aquariums


More information
Countries FAO areas Ecosystems Occurrences Introductions Ecology Diet Food items Food consumption Ration	Common names Synonyms Metabolism Predators Ecotoxicology Reproduction Maturity Spawning Eggs Egg development	Age/Size Growth Length-weight Length-length Length-frequencies Morphometrics Morphology Larvae Larval dynamics Recruitment	Other references Biblio Aquaculture Aquaculture profile Strains Genetics Allele frequencies Heritability Diseases Processing	Collaborators Pictures Stamps Sounds Ciguatera Speed Swim. type Gill area Otoliths Brains Vision

Tools
Biogeographic modelling \| E-book \| Field guide \| Length-frequency wizard \| Life-history tool \| Point map

Special reports
Check for Aquarium maintenance \| Check for Species Fact Sheets \| Check for Aquaculture Fact Sheets

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Summary page \| Point data \| Common names \| Photos

Internet sources

Estimation of some characteristics with mathematical models

Resilience (Ref. 69278)

Medium, minimum population doubling time 1.4 - 4.4 years (Assuming tm=2-4, Fec>1000)


Vulnerability (Ref. 59153)	Price category (Ref. 80766)
Low to moderate vulnerability (28 of 100)	Not marketed/unknown

Entered by Torres, Armi G.

Modified by Bailly, Nicolas

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Page last modified by : elaxamana, 15 July 2009

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