Salmon shark, Lamna ditropis, movements, diet, and abundance in the eastern North Pacific Ocean and Prince William Sound, Alaska

Hulbert, Leland B.; Rice, Stanley D. (Stanley Donald)

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Salmon shark, Lamna ditropis, movements, diet, and abundance in the eastern North Pacific Ocean and Prince William Sound, Alaska

2002
By Hulbert, Leland B. ; Rice, Stanley D. (Stanley Donald)

[PDF-1.75 MB]

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Details:

Alternative Title:

Exxon Valdez oil spill, restoration project final report
Personal Author:

Hulbert, Leland B. ; Rice, Stanley D. (Stanley Donald)

Hulbert, Leland B. ; Rice, Stanley D. (Stanley Donald) Less -
Corporate Authors:

Auke Bay Laboratory (Juneau, Alaska) ; Exxon Valdez Oil Spill Trustee Council

Auke Bay Laboratory (Juneau, Alaska) ; Exxon Valdez Oil Spill Trustee Council Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service)
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.
Content Notes:

Leland B. Hulbert, Stanley D. Rice.

Issued in part by the Exxon Valdez Oil Spill Trustee Council.

"Restoration project 02396, final report."

"December 2002."

Also available online in PDF.

Includes bibliographical references (p. 24-26).
Keywords:

[+]

Effect Of Oil Spills On Exxon Valdez Oil Spill, Alaska, 1989 Food Migration Salmon Shark Shark Fisheries
Document Type:

Miscellaneous
Place as Subject:

Alaska ; Prince William Sound

Alaska ; Prince William Sound Less -
Rights Information:

Public Domain
Compliance:

Library
Main Document Checksum:

[+]

urn:sha256:f47f00b3aed300223d05a967318907f5f832c89af0f190a4ae062bb970fcf94b
Download URL:

https://repository.library.noaa.gov/view/noaa/4968/noaa_4968_DS1.pdf
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Salmon shark, Lamna ditropis, movements, diet, and abundance in the eastern North Pacific Ocean and Prince William Sound, Alaska

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