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Nematolebias whitei, Rio pearlfish : fisheries, aquarium
> Cyprinodontiformes (Rivulines, killifishes and live bearers) > Rivulidae (Rivulines) > Cynolebiinae
Etymology: Nematolebias:Greek, nema, -atos = filament + Greek, lebias, ou = a kind of small fish (Ref. 45335). Eponymy: General Thomas Dresser White (1901–1965) was the Chief of Staff, United States Air Force, in which he served (1924–1961), having initially been an infantry officer (1920–1924). [...] (Ref. 128868), visit book page. More on author: Myers.
Ambiente: milieu / zona climática / intervalo de profundidade / gama de distribuição Ecologia
Espinhos dorsais (total) : 0; Raios dorsais moles (total) : 13 - 19; Espinhos anais: 0; Raios anais moles: 18 - 24; Vértebras: 29 - 31. Having series of small bluish white spots, often coalesced to form continuous or fragmented line, on subdistal area of caudal fin and dark brown to black stripe on border of anal fin, adjacent and parallel to perpendicular extensions of subdistal golden transverse lines. Dorsal head profile slightly convex to nearly straight in male, gently concave to approximately straight in female (Ref. 42934). Body shape (shape guide): fusiform / normal.
Adults occur in small freshwater temporary pools in floodplains of streams and lagoons. These pools are shallow with compact, soft reddish brown muddy bottom and dry twice a year, during winter, usually from July to August, and during summer, usually from February to March. During dry season, all fish die and eggs undergo in diapause within the substrate. Eclosion happens at the onset of wet season, usually March-April and September-October (Ref. 42934). This species was introduced in California (Ref. 4357). Bottom spawner, 4 months incubation. Is easy to maintain in the aquarium (Ref. 27139).
Ciclo de vida e comportamento de acasalamento Maturidade | Reprodução | Desova | Ovos | Fecundidade | Larvas
Males are territorial and very aggressive. Males display an elaborate courtship behavior beginning with waving lateral movement in front of female, with the unpaired fins completely opened. In an oblique position, the male touches the bottom surface with the anterior portion of its head, with vibrating body. The female placed her body side to side with the male. Then both couple dives into the substrates where spawning takes place (Ref. 42934).
Costa, W.J.E.M., 2002. The neotropical seasonal fish genus Nematolebias (Cyprinodontiformes: Rivulidae: Cynolebiatinae): taxonomic revision with description of a new species. Ichthyol. Explor. Freshwat. 13(1):41-52. (Ref. 42934)
Categoria na Lista Vermelha da IUCN (Ref. 130435: Version 2025-2 (Global))
Ameaçada (EN) (B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v)); Date assessed: 18 May 2022
Dinâmica das populações Parâmetros de crescimento Idades / tamanhos máximos Comprimento-peso rel. Comprimento-comprimento rel. Frequência de comprimento Conversão de massa Recrutamento Abundância
Ciclo de vida Reprodução Maturidade Maturidade/Rel. das guelras Fecundidade Desova Agregações de desova Ovos Desenvolvimento dos ovos Larvas Dinâmica larvar
Fisiologia Composição corporal Nutrientes Consumo de oxigénio Tipo de natação Velocidade de natação Pigmentos visuais Som de peixe Doenças e Parasitas Toxicidade (LC50s)
Índice de diversidade filogenética (Ref. 82804): PD50 = 0.6250 [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): 3.3 ±0.4 se; based on size and trophs of closest relatives
Resiliência (Ref. 120179): Elevada, tempo mínimo de duplicação da população menor que 15 meses (tm=0.1).
Vulnerabilidade da pesca (Ref. 59153): Low vulnerability (10 of 100). 🛈
