Funding for this research was provided by:
National Oceanic and Atmospheric Administration (NA17FX1429)
North Pacific Research Board (R1011, R1512, R1310)
U.S. Department of Commerce
Pollock Conservation Cooperative Research Center (G5498)
North Pacific Fisheries Foundation
Text and Data Mining valid from 2018-05-15
Received: 1 February 2018
Accepted: 23 April 2018
First Online: 15 May 2018
Ethics approval and consent to participate
: This study was carried out in strict compliance with all applicable animal care and use guidelines under the U.S. Animal Welfare Act and was approved as required under the U.S. Marine Mammal Protection Act and the U.S. Endangered Species Act by the National Marine Fisheries Service (permit numbers 1034–1685, 1034–1887, 881–1890, 881–1668, 14,335, 14,336, and 18,537 and by the Institutional Animal Care and Use Committees of the Alaska Sea Life Center (protocol numbers 02–015, 03–007, 05–002, 06–001, 08–005, and R10–09-04) and the Alaska Department of Fish and Game (protocol numbers 2017–48 and earlier).
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.