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Project Information

Title: PWS Herring Program - Expanded Adult Herring Surveys

Project Year and Number: 2012: 12120111-E

Other Fiscal Years and Numbers for this Project: 2017: 17120111-G, 2014: 14120111-E, 2013: 13120111-E

Principal Investigator (PI): Michele Buckhorn, Prince William Sound Science Center

Assisting Personnel: Dick Thorne

Research Location: Prince William Sound

Restoration Category: Research

Injured Resources Addressed: Not Specified

Abstract: Prince William Sound herring stock biomass estimates from hydroacoustic surveys provide a direct measure of the stock abundance and are also a primary input into the age-structured assessment (ASA) model that is the forecasting tool used for managment. Prior to 2001, the hydroacoustic surveys were conducted exclusively by the Prince William Sound Science Center (PWSSC). Since 2001, the effort has been shared between PWSSC and the Cordova office of Alaska Department of Fish and Game (ADF&G). While the ADF&G considers the hydroacoustic surveys to be critical (Steve Moffitt, personal communication) the lack of a commercial herring fishery in PWS since 1998 has reduced management priorities for herring. Thus the PWSSC contribution has become critically important for the long-term, especially if a future fishery appears only a remote possibility. With the level of effort available over the past several years, PWSSC and ADF&G individually have achieved herring biomass estimates with a precision of about ±30%, which is insufficient for management purposes. However, the combined effort currently meets management requirements for precision. Current stock assessment efforts by ADF&G resource managers in PWS focus on the largest spawning aggregations. The objective of this study is to increase the current survey area of adult spawning beyond the Port Gravina and Fidalgo areas to provide a more precise estimate of spawning biomass. We propose to extend the PWSSC acoustic surveys to help identify the relative contributions of additional spawning aggregations over temporal and spatial scales. This will help establish more accurate estimates of the total herring biomass in PWS and provide an alert to changes in biomass in different regions. Beginning in FY2013 and continuing until 2016, hydroacoustic surveys will be conducted in late spring (April-May) to assess adult spawning biomass. ADF&G will continue to conduct direct sampling for age/length/weight. Additional direct capture will be conducted using a midwater trawl at adult spawning sites (See Bishop proposal).


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Proposal: View PDF (52 KB)

Funding Recommendations: View

Funding Detail For: 2012 , 2013 , 2014 , 2015 , 2016

Quarterly Project Tasks For: 2012 , 2013 , 2014 , 2015 , 2016

Annual Reports: 2012: View (1,139 KB) 2013: View (39 KB) 2014: View (130 KB) 2015: View (3,669 KB) 2016: Due 09/01/2016

Final Report: Final Report Not Available - For Current Status Please Contact Us

Publications from this Project: None Available

More information may be available for this project under other years:

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Project Number Proposal Annual Reports Final Report Data
2017: 17120111-G View (PDF) 2017: View (PDF)
Final Report Not Available - For Current Status Please Contact Us No datasets
2014: 14120111-E View (PDF) 2014: View (PDF)
Final Report Not Available - For Current Status Please Contact Us No datasets
2013: 13120111-E View (PDF) 2013: Due 09/01/2013
Final Report Not Available - For Current Status Please Contact Us No datasets