Salmon Shark

Salmon Shark Fishing

Salmon Shark Images

• Salmon sharks stay in groups based on gender and size.
• They usually hunt by themselves, but may also join feeding groups, consisting of up to 40 individuals.
• They migrate seasonally and have been observed to follow the migration patterns of their prey.

They live on Pacific salmon, steelhead trout, Pacific herring, Pollock, sardines, daggertooth, pomfrets, sculpins, and Pacific sauries.

Copulation takes place when the male bites a female’s pectoral fin to hold on to them and inserts one of its modified pelvic fins, known as claspers into the female’s cloaca. The gestation period lasts for about 9 months after which a litter of 2-6 pups is born. During gestation, the embryos feed on the mother’s ova.

Life-cycle

Male salmon sharks become capable of reproducing by the time they are 5 years old, but females may take as long as 8 to 10 years to become sexually mature.

Salmon Shark Size

Salmon Sharks

Lifespan

They can live for between 20 to 30 years.

Communication

They communicate through visual, auditory, olfactory, mechanical, chemoreceptive, and electroreceptive channels.

Adaptations

• These sharks are endothermic and keep their core body temperature higher than the temperature of the water they are in. They achieve this by retaining the heat generated as a result of cell metabolism.
• Their eyes have binocular vision, helping them locate prey more easily.
• Small pores on the snouts help gather electromagnetic signals emitted from the movement of swimming fish.
• Sharp teeth help the shark kill and tear their food into bite-sized pieces.
• The tail is shaped like a crescent moon and gives good propulsion to the shark in the water.

Predators

Great white sharks, blue sharks, and adult salmon sharks may prey on juvenile salmon sharks. Adult salmon sharks have no natural predators.

Salmon Shark Teeth

Salmon Shark Pictures

IUCN Conservation Status

The IUCN currently lists the salmon shark under their ‘Least Concern’ category.

Interesting Facts

• The salmon shark is often misidentified as the great white shark but can be distinguished by their shorter snout and blotchy belly. Another behavioral distinction the salmon shark has from its cousin is that it is far more docile compared to the great white, and only one documented case of an attack on a human has been recorded.
• There is a significant and unexplained disparity in the sex-ratio of salmon sharks from the eastern population of the north Pacific to the western.
• There is a cap on salmon shark fishing in Alaska, where one person can only fish it twice per year.

• Video

• References
  • 
    http://environmentalaska.us/salmon-sharks.html
    http://animaldiversity.org/accounts/Lamna_ditropis/
    http://www.arkive.org/salmon-shark/lamna-ditropis/
    http://www.adfg.alaska.gov/index.cfm?adfg=salmonshark.main
    http://www.iucnredlist.org/details/39342/0