| Salmon shark, Lamna ditropis, movements, diet, and abundance in the eastern North Pacific Ocean and Prince William Sound, Alaska - :4968 | National Marine Fisheries Service (NMFS)
Stacks Logo
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.
 
 
Help
Clear All Simple Search
Advanced Search
Salmon shark, Lamna ditropis, movements, diet, and abundance in the eastern North Pacific Ocean and Prince William Sound, Alaska
  • Published Date:
    2002
Filetype[PDF-1.75 MB]


Details:
  • Corporate Authors:
    Auke Bay Laboratory (Juneau, Alaska) ; Exxon Valdez Oil Spill Trustee Council ;
  • Description:
    Salmon shark movement, diet, and abundance data were used to assess the role of the salmon shark, Lamna ditropis (Hubbs & Follett 1947), as a top predator in the trophic ecology of Prince William Sound (PWS). Based on our observations, we propose 4 modes of movement for salmon sharks in the Gulf of Alaska (GOA) and eastern North Pacific Ocean: focal foraging movements, foraging dispersals, directed migrations, and annual fidelity to PWS focal foraging areas. Salmon sharks aggregating at focal foraging areas in PWS are associated in time and space with adult Pacific salmon (Oncorhynchus spp.) spawning migrations. As adult salmon concentrations taper off in late summer, salmon sharks disperse from focal foraging areas in PWS; some sharks continue to forage in PWS and the northern GOA into fall and winter months, while other sharks tracked by this study underwent directed southeasterly migrations toward the west coasts of Canada and the United States. Adult Pacific salmon were the principle prey during summer months in PWS, but salmon sharks had a varied diet even when adult salmon were abundant. From systematic aerial survey counts, we estimate 2,000 salmon sharks were at the surface of Port Gravina on August 16, 2000. We estimate these 2,000 salmon sharks consumed 263,000 kg of prey during an estimated 45 day residency in Port Gravina in 2000.

  • Document Type:
  • Supporting Files:
    No Additional Files
No Related Documents.
You May Also Like: