Rhizoprionodon acutus (Rüppell, 1837)

Milk shark
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Rhizoprionodon acutus   AquaMaps   Data sources: GBIF OBIS
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Classificação / Names Nomes comuns | Sinônimos | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (tubarões e raias) (sharks and rays) > Carcharhiniformes (Ground sharks) > Carcharhinidae (Requiem sharks)
Etymology: Rhizoprionodon: Greek, rhiza = root + Greek, prion = saw + Greek, odous = teeth (Ref. 45335).  More on author: Rüppell.

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

; marinhas; Água doce; estuarina bentopelágico; anfídromo (Ref. 51243); intervalo de profundidade 1 - 200 m (Ref. 244).   Tropical; 41°N - 30°S, 27°W - 156°E

Distribuição Países | Áreas da FAO | Ecossistemas | Ocorrências | Point map | Introduções | Faunafri

Eastern Atlantic: Mauritania to Angola; reported from the Gulf of Taranto (Ref. 231). Indo-West Pacific: Persian Gulf (Ref. 68964), Red Sea and East Africa to Indonesia, north to Japan, south to Australia.

Comprimento de primeira maturação / Tamanho / Peso / Idade

Maturity: Lm ?, range 70 - 80 cm
Max length : 175 cm TL macho/indeterminado; (Ref. 12693); 80.8 cm TL (female); common length : 110 cm TL macho/indeterminado; (Ref. 47737); peso máx. publicado: 5.0 kg (Ref. 40637); idade máx. registrada: 8 anos (Ref. 244)

Descrição suscinta Morfologia | Morfometria

Espinhos dorsais (total): 0; Raios dorsais (total): 0; Espinhos anais 0; Raios anais : 0. A small shark with a long, narrow, snout, big eyes without notches, long labial furrows, and oblique-cusped teeth which may be smooth-edged or weakly serrated; 2nd dorsal fin small, low and behind larger anal fin; no interdorsal ridge (Ref. 5578). Grey or grey-brown above, white below (Ref. 5578). Dorsal and anal fins with dusky or blackish edges, fins slightly darker than back (Ref. 9997).

Biologia     Glossário (p.ex. epibenthic)

Found on continental shelves, often on sandy beaches and rarely in estuaries (Ref. 244). Reported to enter freshwater and recorded several times from Cambodia as far upstream as the Great Lake (Ref. 12693). Occurs near the surface in shallow waters (Ref. 12693). Feeds mainly on small pelagic and benthic bony fishes, also cephalopods and other invertebrates (Ref. 244). Viviparous (Ref. 50449). Utilized fresh and possibly dried salted for human consumption and for fishmeal (Ref. 9997). The 178 cm specimen recorded off Africa is possibly based on some other species (Ref. 9997).

Ciclo de vida ou comportamento de acasalamento Maturidade | Reprodução | Desova | Ovos | Fecundidade | Larvas

Distinct pairing with embrace (Ref. 205). Viviparous, with a yolk-sac placenta; 2 to 8 in a litter (Ref. 9997), usually 2 to 5 after a gestation period of ~ 12 months; no seasonality in the reproductive cycle (Ref.58048). Size at birth between 25 and 39 cm.

Referência principal Upload your references | Referências | Coordenador : Compagno, Leonard J.V. | Colaboradores

Compagno, L.J.V., 1984. FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 2 - Carcharhiniformes. FAO Fish. Synop. 125(4/2):251-655. Rome: FAO. (Ref. 244)

Status na Lista Vermelha da UICN (Ref. 120744)

  Segura ou pouco preocupante (LC) ; Date assessed: 30 April 2003

CITES (Ref. 118484)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Ameaça para os humanos

  Harmless (Ref. 244)





Uso pelos humanos

Pescarias: espécies comerciais; peixe esportivo: sim
FAO(Publication : search) | FishSource | Sea Around Us

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Estimates based on models

Preferred temperature (Ref. 115969): 19.6 - 28.5, mean 26.9 (based on 1463 cells).
Índice de diversidade filogenética (Ref. 82805):  PD50 = 0.5078   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00331 (0.00252 - 0.00435), b=3.09 (3.04 - 3.14), in cm Total Length, based on LWR estimates for this species (Ref. 93245).
Nível Trófico (Ref. 69278):  4.3   ±0.4 se; Based on diet studies.
Generation time: 5.5 ( na - na) years. Estimated as median LN(3)/K based on 1 growth studies.
Resiliência (Ref. 120179):  Muito baixo(a), tempo mínimo de duplicação da população maior que 14 anos (K=0.2-0.6; Fec=1).
Vulnerabilidade (Ref. 59153):  High vulnerability (61 of 100) .
Categoria de preço (Ref. 80766):   Medium.