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> Siluriformes (Catfishes) > Anchariidae (Vaonas)
Etymology: griseus: The specific name comes from the Latin griseus, meaning gray, in reference to its colouration (Ref. 56142).

Environment: milieu / climate zone / depth range / distribution range Ekologi

; sötvatten bottenlevande. Tropical

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Africa: Onilahy River drainage, southcentral Madagascar (Ref. 56142).

Size / Vikt / Age

Maturity: L_m ? range ? - ? cm
Max length : 24.4 cm SL hane/ej könsbestämd; (Ref. 56142)

Short description Bestämningsnycklar | Morfologi | Morfometri

Taggstrålar i ryggfenan (totalt) : 2; Mjukstrålar i ryggfenan (totalt) : 6 - 7; Taggstrålar i analfenan: 0; Mjukstrålar i analfenan: 15; Ryggkotor: 42 - 44. Diagnosis: Ancharius griseus is distinguished from A. fuscus in having a longer dorsal-fin spine, 22.9-24.3% of standard length vs. 14.6-22.6%; longer snout, 49.2-51.3% of head length vs. 40.1-45.8%; smaller eye, 9.3-10.1% of head length vs. 11.4-15.4%; and pectoral spine serrated posteriorly along only its distal half vs. entire length (Ref. 56142).

The river at the type locality runs through grassland/savannah and the habitat can be characterized as mildly disturbed; the water is clear, deep, and swift flowing, with area of calmer water, and the substrate mostly sandy to rocky (Ref. 56142).

Life cycle and mating behavior Maturities | Reproduktion | Spawnings | Egg(s) | Fecundities | Larver

Main reference Upload your references | referenser | Koordinator | Medarbetare

Ng, H.H. and J.S. Sparks, 2005. Revision of the endemic Malagasy catfish family Anchariidae (Teleostei: Siluriformes), with descriptions of a new genus and three new species. Ichthyol. Explor. Freshwat. 16(4):303-323. (Ref. 56142)

IUCN Red List Status (Ref. 130435)

Endangered (EN) (B1ab(iii)); Date assessed: 01 July 2016

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Harmless

Human uses

FAO - Publication: search | FishSource |

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Trophic ecology
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Estimates based on models

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 0.7656 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), in cm total length, based on all LWR estimates for this body shape (Ref. 93245).

Trofisk nivå (Ref. 69278): 3.4 ±0.4 se; based on size and trophs of closest relatives

Fishing Vulnerability (Ref. 59153): Low vulnerability (20 of 100).

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Ancharius griseus Ng & Sparks, 2005