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Bluntnose sevengill shark (Notorynchus cepedianus) — Hexanchidae

Bluntnose sevengill shark

Notorynchus cepedianus
Family: Hexanchidae
VU · Vulnerable

The Bluntnose sevengill shark (Notorynchus cepedianus) is a brackish-water fish of the family Hexanchidae that grows up to 300 cm.

Length
300 cm
Water
Brackish
Depth
0.0–570.0 m
Diet
Carnivore
Behaviour
Small groups
Body shape
Elongated (eel-like)
Substrate
Sand / mud bottom
Danger
Can cause injury
Range
Worldwide in temperate coastal waters; continental shelf, bays and estuaries.
Edibility
Rarely eaten

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Description

The broadnose sevengill shark is a large, ancient shark of the cow shark family (Hexanchidae), recognisable by its seven gill slits instead of the usual five and a single dorsal fin set far back. The species grows to about three metres and has a broad, blunt head profile and a grey body with numerous small dark and light spots. It lives on the continental shelf, often in shallow water, bays and estuaries. As a powerful apex predator it hunts, often in groups, sharks, rays, bony fishes and marine mammals. The broadnose sevengill shark is listed as Vulnerable (VU). It is potentially dangerous and can bite; keep well clear.

Frequently asked questions

How do you recognise the Bluntnose sevengill shark?

The Bluntnose sevengill shark has an elongate, eel-like body, is mainly silver-grey and shows a spots pattern. Seven gill slits (instead of five) and a single dorsal fin set far back; powerful apex predator.

Where does the Bluntnose sevengill shark live?

The Bluntnose sevengill shark lives in brackish water and is mostly found around sand or mud bottom. Worldwide in temperate coastal waters; continental shelf, bays and estuaries.

How big does the Bluntnose sevengill shark get?

The Bluntnose sevengill shark grows to a maximum of about 300 cm. On average the species is around 150 cm.

Is the Bluntnose sevengill shark dangerous to humans?

The Bluntnose sevengill shark can cause injury; handle it with care. Not venomous, but a large shark with sharp teeth; keep well clear of a caught or hooked shark and handle only with the greatest care. Clean any bite wound and seek medical care.

Is the Bluntnose sevengill shark edible?

The Bluntnose sevengill shark is rarely eaten.

More photos

Bluntnose sevengill shark (Notorynchus cepedianus) — Hexanchidae — 2
iNaturalist ((c) marciariederer, some rights reserved (CC BY-NC))
Bluntnose sevengill shark (Notorynchus cepedianus) — Hexanchidae — 3
iNaturalist ((c) Bradley Rasmussen, some rights reserved (CC BY-NC))
Bluntnose sevengill shark (Notorynchus cepedianus) — Hexanchidae — 4
iNaturalist ((c) sf_angler, some rights reserved (CC BY-NC))
Bluntnose sevengill shark (Notorynchus cepedianus) — Hexanchidae — 5
iNaturalist ((c) Jonathan Williams, some rights reserved (CC BY-NC))
Fin

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All data

Identification

English name
Bluntnose sevengill shark verified
Scientific name
Notorynchus cepedianus
Family
Hexanchidae
Other names
Broad snouted sevengill; Broadnose sevengill; Broadnose sevengill shark; Cowshark; Sevengill shark; Broadnose shark; Broad-snout; Broadsnout sevengill shark; Broadsnouted sevengill shark; Ground shark; Pacific seven-gill shark; Seven-gill cowshark verified

Appearance

Size class
Extra large verified
Max length (cm)
300.0 verified
Average length (cm)
150.0 verified
Body shape
Elongated (eel-like) sourced
Dominant colour
Silver / grey inferred
Pattern
Spots inferred
Tail shape
Crescent (lunate) inferred
Mouth position
Inferior (downward) inferred
Lips
Thin inferred
Barbels
No sourced
Dorsal fins
One continuous inferred
Dorsal spines
No sourced

Habitat & distribution

Water type
Brackish sourced
Substrate
Sand / mud bottom sourced
Min depth (m)
0.0 verified
Max depth (m)
570.0 verified
Natural range
Worldwide in temperate coastal waters; continental shelf, bays and estuaries. inferred
Origin
Native sourced

Behaviour & biology

Diet
Carnivore sourced
Diet (detail)
Sharks, rays, bony fishes and marine mammals sourced
Social behaviour
Small groups inferred
Territorial
No inferred
Reproduction
Separate sexes sourced
Sexual dimorphism
No inferred
levensduur_max_jaar
49.0 verified
Seasonality
Present year-round in its habitat; no pronounced seasonality known. inferred
Special features
Seven gill slits (instead of five) and a single dorsal fin set far back; powerful apex predator. sourced

For anglers

Edibility
Rarely eaten sourced
Fishing method
Bottom fishing with natural bait (worm, shrimp or fish) on or just above the seabed. inferred
Regulations source
FishBase ↗ inferred

Safety

Danger to humans
Can cause injury sourced
First aid
Not venomous, but a large shark with sharp teeth; keep well clear of a caught or hooked shark and handle only with the greatest care. Clean any bite wound and seek medical care. sourced

Status & sources

Sources
FishBase via GBIF (DwC-A), CC-BY-NC 4.0

More from the family Hexanchidae

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