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2020 International Council For Exploration Of The Sea (ICES) Workshop Announcement, Unavoidable Survey Effort Reduction

The International Council for Exploration of the Sea Working Group on Improving use of Survey Data for Assessment and Advice invites survey and stock assessment scientists to investigate challenges and responses to unavoidable reductions of survey effort.


Monday, January 13

10am1:00       Registration

1:001:10         Stan Kotwicki, AFSC         Opening Remarks, Terms of Reference

1:101:30         Introductions

2:102:40         Sven Kupschus, CEFAS         Key Note Message:  European Perspective

2:403:10         Rick Methot, NMFS         Key Note Message:  United States Perspective

3:103:30         Stan Kotwicki, AFSC         Challenges and priorities for WKUSER and beyond

3:304:30         Discussion on challenges and priorities (including examples of experiences and outcomes, defining extend of the problem across ICES countries)

4:305:00         Discussion on specific topics to work on during workshop (e.g. approaches to effort reduction, simulations, modeling, capturing true uncertainty in stock assessment, advice approaches). Start thinking about breakout sessions and sub-working groups to tackle specific issues.

After 5 pm         Social Event

Tuesday, January 14

9am5pm         Contributed talks -- European and American surveys.


9am9:15         Sven Kupschus, CEFAS         An overview of European surveys.

9:159:30         Rick Rideout, DFO         An Overview of Fisheries and Oceans Canada’s Multispecies Bottom Trawl Surveys in the Newfoundland and Labrador Region: Survey Coverage Issues and Implications for the Provision of Science Advice.

9:309:45         Michael Martin, AFSC         An overview of NOAA Fisheries Surveys.

9:4510:00         Anne Hollowed, AFSC         SSC perspective on trade-offs among trawl survey schemes in federal waters off Alaska under varying funding scenarios.

10:0010:15         Kotaro Ono, IMR         A spatiotemporal operating model for simulation testing Alaskan bottom trawl survey effort and design.


10:1510:30         BREAK


TOR I.         The current processes used in dealing with unavoidable reductions in survey effort and examine the existing coping strategies (e.g. spatial coverage, survey frequency, or sampling density) and their qualitative consequences.


10:3010:45          Kristin Marshall, NWFSC         Understanding trade-offs with survey frequency using Management Strategy Evaluation (MSE): a Pacific Hake case study.

10:4511:00         Owen Hamel NWFSC         The effect of survey frequency and intensity on U.S. West Coast groundfish stock assessments.


11:0011:15         BREAK


11:1511:30         Ned Laman, AFSC            Effect of reducing sampling density on design- and model-based estimates of abundance from groundfish surveys in the Gulf of Alaska.

11:3011:45         Gwladys Lambert, CEFAS         Reducing effort in a stratified fixed station survey – impact on survey indices and assessment of a data rich and data-limited stock.


TOR II.         Develop key quality metrics that can be used to describe “total survey uncertainty” for survey derived indices of abundance for common survey designs.


11:4512pm         Jim Thorson, AFSC         Measuring the impact of increased ageing effort:  theory and case-study demonstration

12:0012:15         Stan Kotwicki, AFSC         The effect of variable sampling efficiency on the reliability of observation error as a measure of uncertainty in abundance indices from scientific surveys.


12:151:15         LUNCH         NOAA Cafeteria


1:151:30         Elaina Jorgensen, AFSC         Systematic reduction in survey effort and the effect on variance of fish abundance.

1:301:45         Peter Munro, AFSC         Comparing three estimators of change in trawl survey mean catch per unit effort (CPUE) the Mean Squared Error (MSE) of the estimate under different simulated scenarios.

1:452:00         Paul Spencer, AFSC         Variance propagation from fishery-independent surveys to the stock assessment outputs.


TOR III.         Define “changes to survey designs” that require inter-survey calibration and what changes can be resolved by a model-based approach to index generation.


2:002:15         Paul Von Szalay, AFSC         A Comparison of Bottom Trawl Sampling Strategies in the Gulf of Alaska: Design vs. Model-Based Approaches.

2:152:30         Kresimir Williams, AFSC         Cameras vs Catch: potential effects of implementing open codend tows for acoustic midwater fish surveys.

2:302:45         Jason Conner, AFSC         Effect of reducing the sampling density of the eastern Bering Sea shelf survey by comparing three station allocation designs (simple random, stratified random, random-start systematic) using design-based and model-based estimators of mean and variance.

2:453:00         Jennifer Blaine, WDFW         Puget Sound scientific bottom trawling: sampling design changes and consequences.


3:003:15         BREAK


TOR IV.         Develop methods that can provide quantitative decision-making tools describing the impacts on the quality of the survey deliverables and advisory products.


3:153:30         Meaghan Bryan, AFSC         The Impact of survey frequency and intensity on detecting environmental anomalies and shifts in abundance.

3:303:45         Curry Cunningham, UAF         Implications of changes in bottom trawl survey effort on the quality of stock assessment results.

3:454:00         Sven Kupschus, CEFAS         Resampling survey data to assess the effects of survey changes on management metrics from assessments.

4:004:15         Lauren Rogers, AFSC         Evaluation of a survey with an adaptive sampling domain to capture climate-driven shifts in larval fish distributions

4:154:30         Jon Richar, AFSC         Considering changes in sampling density and survey frequency, and their effects on eastern Bering Sea crab population time series.

4:304:45         Chris Rooper DFO         Accounting for habitat variables to improve abundance indices in Alaska trawl surveys with an emphasis on results from averaging multiple modeling methodologies.

4:455:00         Nicola Walker, CEFAS         Is the North Sea IBTS oversampled – computer-based study of the effects of reduced sampling on stock assessments?

5:005:15         Cynthia Yeung, AFSC         Survey Effort Reduction Impacts on the Assessment of the Thermal State of the Bering Sea Ecosystem.

5:155:30pm         Discussion, formulating specific topics for sub-working groups. Dividing into sub-working groups


5:30pm         Adjourn

6:00pm         No-host Social and Welcome

Wednesday, January 15

9am12pm          Work on specific problems in break out groups

12:001:00          Lunch          NOAA Cafeteria

1:005:00          Work on specific problems in break out groups

5:00pm          Adjourn

6:00pm          No-host Dinner Social

Thursday, January 16

9am10:30          Working groups presentations, discussion

10:3012pm          Work on specific problems in break out groups

12:001:00          Lunch          NOAA Cafeteria

1:005:00          Writing break out groups reports

5:00pm          Adjourn

Friday, January 17

9am10:00          TBD          Plenary: Synopsis: What did we learn and where do we go from here?

10:0011:00          Stan Kotwicki AFSC          Challenges and priorities remaining. What’s next, practical matters?

11:0012:00          Writing final report

12:00pm          Closing Remarks

Last updated by Alaska Fisheries Science Center on 03/22/2022