Rhizoprionodon acutus, Milk shark : fisheries, gamefish

Rhizoprionodon acutus (Rüppell, 1837)

Milk shark
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Native range | All suitable habitat | Point map | Year 2050
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Rhizoprionodon acutus   AquaMaps   Data sources: GBIF OBIS
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Klassificering / Namn Populärnamn | synonymer | Catalog of Fishes(Släkte, Arter) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (hajar och rockor) (sharks and rays) > Carcharhiniformes (Ground sharks) > Carcharhinidae (Requiem sharks)
Etymology: Rhizoprionodon: rhiza (Gr.), root; prion (Gr.) saw; odon (Gr.), tooth, referring to teeth with serrated (saw-like) bases, or roots [replacement name for Rhizoprion Ogilby 1915, preoccupied by Rhizoprion Jourdan 1861 in mammals] (See ETYFish)acutus: Latin for sharp or pointed, probably referring to narrow, pointed snout (See ETYFish).
More on author: Rüppell.

Miljö: miljö / Klimatzon / djupintervall / distributionsområde Ekologi

marina; sötvatten; brackvatten bentopelagisk; amfidrom (Ref. 51243); djupintervall 1 - 200 m (Ref. 244). Tropical; 41°N - 30°S, 27°W - 156°E

Utbredning Territorier | FAO områden | Ekosystem | Förekomster | Prickkarta | Utplanteringar | Faunafri

Eastern Atlantic: Madeira and Mauritania to Angola (Ref. 244). Indo-West Pacific: Persian Gulf (Ref. 68964), Red Sea and East Africa to Indonesia, north to Japan, south to Australia. Also reported from Gulf of Taranto in Mediterranean Sea (Ref. 231).

Längd vid första mognad / Storlek / Vikt / Ålder

Könsmognad: Lm 75.0, range 70 - 80 cm
Max length : 175 cm TL hane/ej könsbestämd; (Ref. 12693); 80.8 cm TL (female); common length : 110 cm TL hane/ej könsbestämd; (Ref. 47737); publicerad maxvikt: 5.0 kg (Ref. 132927); rapporterad maxålder: 8 år (Ref. 244)

Kort beskrivning Bestämningsnycklar | Morfologi | Morfometri

Taggstrålar i ryggfenan (totalt) : 0; Taggstrålar i analfenan: 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).
Body shape (shape guide): fusiform / normal.

Biologi     Ordlista (t.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).

Livscykel och parningsbeteende Könsmognad | Reproduktion | Lek | Ägg | Fekunditet | Larver

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.

Huvudreferens Ladda upp dina referenser | referenser | Koordinator : Compagno, Leonard J.V. | Medarbetare

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 på IUCN:s rödlista (Ref. 130435: Version 2025-2 (Global))

  Sårbar (VU) (A2bd); Date assessed: 04 February 2020

CITES


CMS (Ref. 116361)

Not Evaluated

Hot mot människor

  Harmless (Ref. 244)





Mänskliga användningsområden

Fiskeri: kommersiell; sportfisk: ja
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Ytterligare information

Trofisk ekologi
Livsmedelsartiklar (preys)
Födosammansättning
Födointag
Matransoner
Predatorer
Ekologi
Ekologi
Populationsdynamik
Tillväxtparametrar
Max. åldrar / storlekar
Längd-vikt rel.
Längd-längd rel.
Längd-frekvenser
Massakonvertering
Rekrytering
Abundans
Livscykel
Reproduktion
Könsmognad
Mognad/Gills rel.
Fekunditet
Lek
Lekande aggregat
Ägg
Utveckling av ägg
Larver
Larvdynamik
Anatomi
Gälyta
Hjärna
Otolit
Fysiologi
Kroppssammansättning
Näringsämnen
Syreförbrukning
Typ av simning
Simhastighet
Visuella pigment
Ljud från fisk
Sjukdomar & Parasiter
Toxicitet (LC50)
Genetik
Genom
Genetik
Heterozygositet
Ärftlighet
Genetisk mångfald
Människorelaterad
Vattenbrukssystem
Vattenbruksprofiler
Avelslinjer
Ciguatera-fall
Frimärken, mynt, diverse.
Uppsökande verksamhet
Medarbetare
referenser
referenser

Verktyg

Särskilda rapporter

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Internet-källor

AFORO (otoliths) | Alien/Invasive Species database | Aquatic Commons | BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes: Släkte, Arter | DiscoverLife | ECOTOX | FAO - Publication: search | Faunafri | Fishipedia | Fishtrace | GloBI | Google Books | Google Scholar | Google | IGFA World Record | Nationella databaser | OneZoom | Open Tree of Life | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Socotra Atlas | TreeBase | Tree of Life | Wikipedia: Go, sök | World Records Freshwater Fishing | Zoologiskt register

Uppskattningar baserade på modeller

Index för fylogenetisk mångfald
(Ref. 82804)
PD50 = 0.5078 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight a=0.00347 (0.00280 - 0.00430), b=3.06 (3.02 - 3.10), in cm total length, based on LWR estimates for this species (Ref. 93245).
Trofisk nivå
(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.
Resiliens
(Ref. 120179)
Mycket låg, lägsta populationsfördubblingstid mer än 14 år (K=0.2-0.6; Fec=1).
Sårbarhet i fisket
(Ref. 59153)
High vulnerability (61 of 100). 🛈
Priskategori
(Ref. 80766)
Medium.
Näringsämnen
(Ref. 124155)
Calcium = 16.4 [2.3, 90.2] mg/100g; Iron = 0.575 [0.146, 1.652] mg/100g; Protein = 21.2 [18.2, 23.5] %; Omega3 = 0.198 [0.082, 0.472] g/100g; Selenium = 58 [16, 171] μg/100g; VitaminA = 20.7 [7.9, 53.8] μg/100g; Zinc = 0.698 [0.324, 1.318] mg/100g (wet weight);