Northern Bering Sea Surface Trawl Survey - 2022
Salmonid Research, Monitoring, and Evaluation (RM&E)
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AK54017 | - | 07/01/2021 | 10/30/2024 | 2020 | Completed | 02/07/2025 | |
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Description
This project completed stock-specific assessments of juvenile Chinook and chum salmon and evaluated the impact of temperature on dietary overlap and condition of juvenile salmon as part of the Northern Bering Sea Ecosystem and Surface Trawl survey in 2023. Work is in progress to integrate information on diet and energetic condition of chum salmon to better inform the relationship between juvenile and adult abundance. Preliminary results indicate a relatively high level of dietary overlap between juvenile pink and sockeye salmon and juvenile Chinook and coho salmon. The dietary overlap between salmon and non-salmon species was variable and influenced by temperature. Parabolic relationships between energy density and sea surface temperature were present, with reduced energy density expected at the highest and lowest temperatures. This response to temperature is consistent with relationships between metabolic growth, feeding response, and temperature.
Project Benefit
This project will fill in knowledge gaps surrounding the early life history of salmon species in the NBS and assist fisheries management through pre-season forecast models of run size that account for changes in the marine ecosystem due to the loss of Arctic sea ice. Pre-season forecasts used in combination with traditional adult based forecasts will help promote sustainable fishing opportunities by subsistence users in the region by assisting with the communication of management plans, enabling management strategies to be developed consistent with stock status, and improving access to the available harvest. Additionally, the ability to predict adult run abundance several years into the future using juvenile-based forecasts allows fishery managers and stakeholders to be more adaptive to changing run sizes years in advance. An improved understanding of the trophic ecology in the NBS will identify the potential for trophic bottlenecks and intra- and interspecific competition for food resources, and provides an important ecosystem context to forecast models and juvenile abundance.
Funding Details |
PCSRF | $271,643 |
State | $102,020 |
Other | $266,427 |
Report Total: | $640,090 |
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Worksites
49465916
- Worksite Identifier: 49465916
- Start Date:
- End Date:
Area Description
No Area Description data was found for this worksite.
Location Information
- Basin:
- Subbasin:
- Watershed:
- Subwatershed:
- State:
- Recovery Domain:
- Latitude: 61
- Longitude: -169
ESU
- Un-Named ESU Chinook
- Un-Named ESU Chum
Map
Photos
Metrics
Metrics
- E.0
Salmonid Research, Monitoring, and Evaluation (RM&E)Y (Y/N)
- . . E.0.a
RM&E Funding 640,090.00
- . . E.0.b
Complement habitat restoration project | |
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- . . E.0.c
Project identified in a plan or watershed assessment. | |
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- . . E.0.d.1
Number of Cooperating Organizations 1
- . . E.0.d.2
Name Of Cooperating Organizations. | |
U.S. Fish and Wildlife Service |
- . . E.0.e.1
Number of reports prepared 3
- . . E.0.e.2
Name Of Report | |
Murphy, J.M., et al. 2022. Northern Bering Sea surface trawl and ecosystem survey plan, 2022. NPAFC Doc. 2024. 3 pp. (Available at https://npafc.org). Murphy,
J.M., et al. In Prep. Northern Bering Sea surface trawl and ecosystem survey, 2024. AFSC Processed Report
Murphy et al. 2022 Northern Bering Sea juvenile salmon abundance. [In] E. Siddon ed. Bering Sea Ecosystem Status Report, 2022. Eastern Bering Sea, Stock Assessment and Fishery Evaluation Report, North Pacific Fishery Management Council, 1007 West 3rd Ave., Suite 400, Anchorage, Alaska 99501. |
- . . E.1
MonitoringY (Y/N)
- . . . . E.1.a
Monitoring funding 380,090.00
- . . . . E.1.b.1
Stream Miles Monitored .00
- . . . . E.1.b.2
Acres of Watershed Area Monitored .0
- . . . . E.1.b.3
Square miles of water monitored47687 (Square miles)
- . . . . E.1.c.2
Salmonid smolt or fry monitoringY (Y/N)
- . . . . . . E.1.c.2.a
# miles (to nearest 0.01 mile) monitored for Salmonid smolt or fry .00
- . . . . E.1.d
Name Of Comprehensive Monitoring Strategy/Program | |
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- . . E.2
ResearchY (Y/N)
- . . . . E.2.a
Research Funding 260,000.00
- . . . . E.2.b.8
Climate change studiesY (Y/N)
- . . . . . . E.2.b.8.a
Key issues addressed by climate change study | |
Sequential years of significant loss of Arctic sea ice has had a compounding effect on the heat budget and overall warming of the northern Bering Sea ecosystem. An improved understanding of the impact of warming climate conditions on salmon stocks in the northern Bering Sea is needed. This project will leverage 18 years of data on the distribution, abundance, stock composition, diets, and energy density of juvenile salmon in the northern Bering Sea to provide insight into the resilience of salmon to warming climate. |
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