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 Porbeagle (Lamna nasus)

  Index
> Photo
> Range Map
> Systematics
> Name
> Appearance
> Coloration
> Distribution
> Biology
> Feeding
> Size
> Reproduction
> Similar Species
> Endangerment
> Danger to Humans

 Photo

Porbeagle
© Unknown
 Range Map

Earth Map


 Systematics

Phylum: Vertebates (Chordata)

Class: Carlilagenous Fishes (Chondrichthyes)
  Order: Mackerel sharks (Lamniformes)
    Family: Mackerel sharks (Lamnidae)
      Genus: Lamna (Lamna)


 Name

Scientific: Lamna nasus
German: Heringshai
English: Porbeagle
French: Requin-taupe commun
Spanish: Marrajo sardinero


 Appearance

Spindle-shaped, heavy built body. Moderately long conical snout. First dorsal fin is large, second one is minute. Large gill slits. Two pairs of caudal keels on peduncle whereas the lower pair is shorter than the top one.

 Coloration

Blue-grey with a light ventral surface. Free rear tip of first dorsal fin is conspicuously white colored.

 Distribution

Mainly in colder waters of both hemispheres. Western Atlantic: Newfoundland, Gulf of St. Lawrence. Eastern Atlantic: Iceland, western Barent Sea to Gibraltar, Mediterranean, Madeira. South Africa (western Cape Province), South central Indo-Pacific. Southwestern South Pacific: Australia, Tasmania, New Zealand. Southeastern Pacific: Chile. Subarctic waters off South Georgia, Kerguelen Islands.

 Biology

Abundant in littoral and epipelagic waters, mainly over the continental shelves. Porbeagles prefer waters of colder temperatures (under 18°C) and therefore do normally not occur in tropical and subtropical waters (only during winter months in the Mediterranean). Found mainly in surface waters down to about 350 m. A very active and fast swimming species. Porbeagles can be found singly or in feeding aggregations.

 Feeding

Feed on schooling fishes such as mackerels, herrings, various gadoids (e.g cods, hakes etc.), small shark species (tope, dogfish) and squid.

 Size

Average size between 150 cm and 180 cm (135 kg), maximum length up to about 365 cm and 230 kg.

 Reproduction

Aplacental viviparity (ovoviviparity), embryos feed on eggs (oophagous). Almost allways 4 pups per litter. Gestation period is not known. Size at birth is between 60 cm to 75 cm. Pups show a fast growth and are born in pelagic waters. Females reach sexual maturity at about 150 cm (about 5 years old). Maximum age about 30 years.

 Similar Species

Shortfin Mako but the makos are more slender and do not have a second keel under the first one on the caudal peduncle.

 Endangerment

Status in the IUCN Red List(1994):

Main criterion: > LR/nt (Low Risk/Near Threatened (1994))
Sub criterion:
Trend: Unknown


 Danger to Humans

Harmless, although some see this species as "potentially dangerous" due to the size and jaws but no accident has ever been recorded.



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