Rhizoprionodon acutus, Milk shark : fisheries, gamefish

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Rhizoprionodon acutus (Rüppell, 1837)

Milk shark
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Native range | All suitable habitat | Point map | Year 2100
This map was computer-generated and has not yet been reviewed.
Rhizoprionodon acutus   AquaMaps   Data sources: GBIF OBIS
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Classificatie / Names Populaire namen | Synoniemen | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (haaien en roggen) (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 Ecologie

; marien; zoetwater; brakwater benthopelagisch; amfidroom (Ref. 51243); diepteverspreiding 1 - 200 m (Ref. 244).   Tropical; 41°N - 30°S, 27°W - 156°E

Verspreiding Landen | FAO regio's | Ecosystems | Voorkomen | Point map | Introducties | 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 / Gewicht / Leeftijd

Maturity: Lm ?, range 70 - 80 cm
Max length : 175 cm TL mannelijk/geslacht niet bekend; (Ref. 12693); 80.8 cm TL (female); common length : 110 cm TL mannelijk/geslacht niet bekend; (Ref. 47737); Maximaal gepubliceerd gewicht: 5.0 kg (Ref. 40637); Maximaal vermelde leeftijd: 8 jaren (Ref. 244)

Korte beschrijving Morfologie | Morfometrie

Dorsale stekels (totaal): 0; Dorsale zachte stralen (totaal): 0; Anale stekels 0; Anale zachte stralen: 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).

Biologie     Verklarende woordenlijst (b.v. 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 Geslachtsrijpheid | Voortplanting | Kuitschieten | Eieren | Fecundity | Larven

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.

Voornaamste referentie Upload your references | Referenties | Coördinator : Compagno, Leonard J.V. | Medewerkers

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 op de Rode Lijst van het IUCN (Ref. 120744)

  Niet bedreigd (LC) ; Date assessed: 30 April 2003

CITES (Ref. 118484)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Gevaarlijk voor mensen

  Harmless (Ref. 244)





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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.
Weerstandsvermogen (Ref. 120179):  zeer laag, minimale populatieverdubbelingstijd meer dan 14 jaar (K=0.2-0.6; Fec=1).
Kwetsbaarheid (Ref. 59153):  High vulnerability (61 of 100) .
Prijsklasse (Ref. 80766):   Medium.