Project Information

Title: HRM Program: Modeling and Stock Assessment of PWS Herring 20120111-C

Project Year and Number: 2020: 20120111-C

Other Fiscal Years and Numbers for this Project: 2024: 24120111-C, 2023: 23120111-C, 2022: 22120111-C, 2021: 21120111-C, 2019: 19120111-C, 2018: 18120111-C, 2017: 17120111-C, 2016: 16120111-Q, 2015: 15120111-Q, 2014: 14120111-Q, 2013: 13120111-Q, 2012: 12120111-Q

Principal Investigator (PI): Trevor Branch (University of Washington)

Managing Agency: NOAA

Assisting Personnel: Dave McGowan (University of Washington), John Trochta (University of Washington)

Project Website: https://pwssc.org/modeling-herring/

Research Location: Prince William Sound

Restoration Category: Monitoring, Research

Injured Resources Addressed: Commercial Fishing, Pacific Herring

Abstract:

Prince William Sound (PWS) herring collapsed shortly after the Exxon Valdez oil spill and has yet to recover. Here, we propose to continue the modeling component to the long-term herring monitoring project, which has as its chief goal an understanding of the current status of PWS herring, the factors affecting its lack of recovery, and an assessment of research and fishery needs into the future. Key products are the following (items 6-8 are related to the postdoctoral fellow):
1. The core product of the modeling project is the maintenance and updating of the new Bayesian age-structured assessment (BASA) model based on the ASA model used by the Alaska Department of Fish and Game (ADF&G), including annual assessment updates of PWS herring and the revision of BASA to fit to new data sources.
2. Adapting the BASA model to better model the disease component of natural mortality. Planned work includes simulation modeling of information that can be obtained from antibodies of viral hemorrhagic septicemia virus (VHSV) in herring (described by Hershberger), to examine whether such data can be used to estimate annual outbreak size, the susceptibility of different ages to VHSV, and the estimation of additional mortality due to VHSV.
3. Collation of catch, biomass, and recruitment time series from herring populations around the world to place the lack of recovery of PWS herring into context.
4. An initial exploration of factors that may be used to predict herring recruitment, including oceanography, climate, competition, and predation.
5. Management strategy evaluation to test alternative harvest control rules for managing the fishery in the future, given realistic variability in productivity over time, and the possibility that the population has moved into a low productivity regime. Ecological, economic and social factors would be considered in the MSE.
6. Examination of physical and ecological processes linked to PWS herring spawning, spawning survival, and survival of juvenile life stages.
7. Examination of physical and ecological processes on recruitment to the PWS and Sitka Sound herring populations.
8. Identifying environmental inputs for incorporation into the BASA model to improve recruitment predictions.


Proposal: View (794 KB)

Reports:
Annual Report: View (1,734 KB)
Final Report: See Project 21120111-C

Publications from this Project: None Available