Rhizoprionodon acutus (Rüppell, 1837)

Milk shark
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Rhizoprionodon acutus   AquaMaps   Data sources: GBIF OBIS
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Classification / Names Nomi Comuni | Sinonimi | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchi (squali e razze) (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

; marino; acqua dolce; salmastro benthopelagico; amfidromo (Ref. 51243); distribuzione batimetrica 1 - 200 m (Ref. 244).   Tropical; 41°N - 30°S, 27°W - 156°E

Distribuzione Stati | Aree FAO | Ecosystems | Presenze | Point map | Introduzioni | 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.

Length at first maturity / Size / Peso / Age

Maturity: Lm ?, range 70 - 80 cm
Max length : 175 cm TL maschio/sesso non determinato; (Ref. 12693); 80.8 cm TL (female); common length : 110 cm TL maschio/sesso non determinato; (Ref. 47737); peso massimo pubblicato: 5.0 kg (Ref. 40637); Età massima riportata: 8 anni (Ref. 244)

Short description Morfologia | Morfometria

Spine dorsali (totale): 0; Raggi dorsali molli (totale): 0; Spine anali 0; Raggi anali molli: 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     Glossario (es. 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).

Life cycle and mating behavior Maturità | Riproduzione | Deposizione | Uova | Fecundity | Larve

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.

Main reference Upload your references | Bibliografia | Coordinatore : Compagno, Leonard J.V. | Collaboratori

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)

IUCN Red List Status (Ref. 120744)

  Least Concern (LC) ; Date assessed: 30 April 2003

CITES (Ref. 118484)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless (Ref. 244)





Human uses

Pesca: commerciale; Pesce da pesca sportiva: si
FAO(Publication : search) | FishSource | Sea Around Us

Informazioni ulteriori

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Aree FAO
Ecosystems
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Morfometria
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Estimates based on models

Preferred temperature (Ref. 115969): 19.6 - 28.5, mean 26.9 (based on 1463 cells).
Phylogenetic diversity index (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).
Trophic Level (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.
Resilienza (Ref. 120179):  Molto basso, tempo minimo di raddoppiamento della popolazione più di 14 anni (K=0.2-0.6; Fec=1).
Vulnerability (Ref. 59153):  High vulnerability (61 of 100) .
Price category (Ref. 80766):   Medium.