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Project Information

Title: PWS Herring Program - Validation of Acoustic Surveys for Pacific Herring Using Direct Capture

Project Year and Number: 2014: 14120111-A

Other Fiscal Years and Numbers for this Project: 2019: 12120111-A, 2018: 12120111-A, 2017: 12120111-A, 2016: 12120111-A, 2015: 12120111-A, 2014: 12120111-A, 2013: 13120111-A, 2013: 12120111-A, 2012: 12120111-A

Principal Investigator (PI): Mary Anne Bishop

Assisting Personnel: None

Research Location:

Restoration Category:

Injured Resources Addressed: Not Specified

Abstract: Acoustic surveys provide a relatively low-cost, remote sensing tool to estimate species-specific fish biomass and abundance. Interpreting acoustic data requires accurate ground truthing of acoustic backscatter to confirm species and length frequency of insonified targets. Since November 2012, juvenile and adult herring acoustic surveys have been conducted in November and late March, respectively. Pelagic trawls are the recommended method for validating species composition and for obtaining relatively unbiased information on length frequency distribution, age, and other biological information. Here we propose to use a low-resistance, light-weight midwater sweeper trawl capable of towing speeds (up to 3 knots) as a method to ground truth acoustic surveys for juvenile herring. Our pelagic trawl surveys will take place in conjunction with and onboard the same vessel as three studies in the PWS Herring Research and Monitoring program: a) Juvenile Herring Abundance Index (years 2-5); b) Acoustic Consistency: Intensive Surveys of Juvenile Herring (year 3). Because of concerns of the Alaska Department of Fish and Game, for the March Expanded Adult Herring Surveys (years 2-5) we are being required to use gillnets and jigging for validation. Our project will provide data on species composition and length frequency to aid in the interpretation of current and historical acoustic surveys. In addition it will provide adult herring samples to Alaska Department of Fish and Game for the adult herring age-structure-analyses model and will provide juvenile herring samples to researchers investigating juvenile herring fitness and disease. Our trawls will also provide fishery-independent surveys for non-herring species, thus increasing our knowledge of pelagic fishes in Prince William Sound.

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Proposal: View PDF (187 KB)

Funding Recommendations: View

Funding Detail For: 2014

Quarterly Project Tasks For: 2014

Annual Report: 2014: View (371 KB)

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
2019: 12120111-A View (PDF) 2019: Due 09/01/2019
2018: Not Applicable
2017: Not Applicable
2016: Not Applicable
2015: View (PDF)
2014: View (PDF)
Draft Final Report Due 4/15/20 No datasets
2013: 13120111-A View (PDF) 2013: Due 09/01/2013
Final Report Not Available - For Current Status Please Contact Us No datasets
2013: 12120111-A View (PDF) 2013: View (PDF)
2012: View (PDF)
Draft Final Report Due 4/15/20 No datasets