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> Atheriniformes (Silversides) > Bedotiidae (Madagascar rainbowfishes)
Etymology: Rheocles: Greek, rheos = stream + Greek, kles, kleis = straits; derhami: Named for Patrick de Rham, director of the Aquatic Conservation Network (Ref. 39832).

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

; Água doce pelágico(a,os,as). Tropical

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Africa: Madagascar.

Tamanho / Peso / Idade

Maturity: L_m ? range ? - ? cm
Max length : 5.0 cm SL macho/indeterminado; (Ref. 39832)

Descrição breve Chaves de identificação | Morfologia | Morfometria

Espinhos dorsais (total) : 2; Raios dorsais moles (total) : 14 - 19; Espinhos anais: 1; Raios anais moles: 15 - 21; Vértebras: 35 - 38. Rheocles derhami is readily distinguished from R. sikorae and R. wrightae by length of upper jaw (32-41%HL versus 46-58) and absence of black pigmentation of genital papilla, from R. pellegrini by number of gill rakers on lower limb of first arch (9-10 versus 6-7), from R. lateralis by caudal peduncle length (67.3-78.6%SL versus 84.6-96.7), and from R. alaotrensis by absence of chest and belly scales and paired predorsal scale rows (Ref. 39832). In life males normally light grey, the second dorsal, anal and caudal fins are bright silvery blue, the throat region is orange-red, light grey females are not brightly colored; preserved specimens are creamy yellow, scale rows in dorsal midline heavily pigmented and darkened (Ref. 39832).

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Referência principal Upload your references | Referências | Coordenador | Colaboradores

Stiassny, M.L.J. and D.M. Rodriguez, 2001. Rheocles derhami, a new species of freshwater rainbowfish (Atherinomorpha: Bedotiidae) from the Ambomboa River in northeastern Madagascar. Ichthyol. Explor. Freshwat. 12(2):97-104. (Ref. 39832)

Categoria na Lista Vermelha da IUCN (Ref. 130435)

Criticamente ameaçada (CR) (A2ac; B1ab(iii,v)); Date assessed: 21 June 2016

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Ameaça para o homem

Harmless

Utilização humana

FAO - Publication: search | FishSource |

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Estimates based on models

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 0.5078 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.01122 (0.00514 - 0.02450), b=3.04 (2.87 - 3.21), in cm total length, based on all LWR estimates for this body shape (Ref. 93245).

Nível Trófico (Ref. 69278): 3.2 ±0.40 se; based on food items.

Fishing Vulnerability (Ref. 59153): Low vulnerability (10 of 100).

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Rheocles derhami Stiassny & Rodriguez, 2001