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 Salmon shark (Lamna ditropis)

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

 Photo

Salmon shark
No image of Salmon shark found in the Shark Database
 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 ditropis
German: Lachshai
English: Salmon shark, Pacific porbeagle
French: Requin-taupe saumon
Spanish: Marrajo salmon


 Appearance

Heavy spindle-shaped body, with a conical snout. Large gill slits. First dorsal fin high and erect with origin over or just behind the pectoral insertions. Very small second dorsal fin with origin over anal fin"s origin. Strong keels on caudal peduncle, with a short secondary keel on the caudal base. Dorsal fin is crescentic shaped.

 Coloration

Dark grey on back, white ventral surface. Dark spots and blotches on underside of body. First dorsal fin dark, with a dark free rear tip.

 Distribution

Northern and Eastern Pacific: Japan, Korea, Bering Sea to southern California, possibly Baja California, Mexico.

 Biology

Common. Lives in coastal and oceanic waters from the surface fown to depth of approximately 150 m, with a preference for boreal to cool water. They are able to maintain a higher body temperature (rete mirabile). This species is solitary, or found in schools or feeding aggregations.

 Feeding

Feeds preferably on the Pacific salmon (Oncorhynchus), and other bony fishes.

 Size

Maximum size about 300 cm, average size between 250 and 280 cm.

 Reproduction

Aplacental viviparous shark (ovoviviparous). Species exhibit intra-uterine cannibalism, where embryos feed on other egg capsules. Up to 4 pups per litter. Males reach maturity between 180 and 240 cm.

 Similar Species

Very similar to the Porbeagle . whose free rear tip of first dorsal fin however turns abruptly white.

 Endangerment

Status in the IUCN Red List(1994):

Main criterion: > DD (Data Deficient)
Sub criterion:
Trend: Unknown


 Danger to Humans

May be potentially dangerous, due to its size and relationship to other potentially dangerous sharks of the same family.



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