Elasmobranchii (hajar och rockor) (sharks and rays) >
Carcharhiniformes (Ground sharks) >
Triakidae (Houndsharks) > Triakinae
Etymology: Triakis: tri-, from tres (L.), three; akis (Gr.), point, referring to each tooth consisting of one large central cusp flanked on by both sides by a small cusplet (See ETYFish); megalopterus: mega-, from megas (Gr.), large; pterus (Gr.), fin, referring to its broad, large fins (See ETYFish).
More on author: Smith.
Miljö: miljö / Klimatzon / djupintervall / distributionsområde
Ekologi
marina bottenlevande; djupintervall 1 - 50 m (Ref. 5578). Subtropical; 30°S - 36°S
Southeast Atlantic: Namibia to Coffee Bay, South Africa.
Längd vid första mognad / Storlek / Vikt / Ålder
Könsmognad: Lm 145.0, range 140 - 150 cm
Max length : 142 cm TL hane/ej könsbestämd; (Ref. 244); 174.0 cm TL (female); publicerad maxvikt: 20.0 kg (Ref. 5485)
Kort beskrivning
Bestämningsnycklar | Morfologi | Morfometri
Taggstrålar i ryggfenan (totalt) : 0; Taggstrålar i analfenan: 0. Blunt snout and a large mouth with small pointed teeth; caudal peduncle short and heavy (Ref. 5578). Grey with numerous black spots which may be sparse or absent in some specimens; new born pups with fewer black spots compared to adults (Ref. 5485); white below (Ref. 5578).
Body shape (shape guide): elongated.
Occurs off sandy beaches, rocky shores and in shallow bays (Ref. 5578). Feeds on crabs, lobsters, bony fish and small sharks (Ref. 5578). Ovoviviparous (Ref. 50449). Forms schools in summer (Ref. 244). Hardy and keeps well in captivity (Ref. 244). Commonly caught by rock and surf sports anglers but not eaten much (Ref. 244). Meat is dried into shark 'biltong' or jerky which commands a relatively high price (Ref. 244). Attains 160 cm, TL (Ref. 36731).
Ovoviviparous, embryos feed solely on yolk (Ref. 50449), with 6 to 12 young in a litter (Ref. 244). 30-32 cm at birth (Ref. 244).
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))
Hot mot människor
Harmless
Mänskliga användningsområden
Fiskeri: mindre kommeriell; sportfisk: ja; Akvarium: Offentliga akvarier
Verktyg
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Uppskattningar baserade på modeller
Önskad temperatur (Ref.
123201): 15.8 - 22.4, mean 19.3 °C (based on 26 cells).
Index för fylogenetisk mångfald (Ref.
82804): PD
50 = 0.5312 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00245 (0.00117 - 0.00517), b=3.14 (2.96 - 3.32), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Trofisk nivå (Ref.
69278): 4.0 ±0.5 se; based on diet studies.
Resiliens (Ref.
120179): Mycket låg, lägsta populationsfördubblingstid mer än 14 år (Fec=6).
Sårbarhet i fisket (Ref.
59153): Very high vulnerability (90 of 100).
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