1. Meetings
  2. Scientific Committee (SC) Meetings
  3. Technical Working Group on Chub Mackerel Stock Assessment (TWG CMSA)
  4. 12th TWG CMSA meeting

12th TWG CMSA meeting

    Location
    Virtual
    Short Name
    TWG CMSA12
    Date
    -
    Registration Due
    Meeting Papers Due
    1. Opening of the Meeting
    2. Adoption of Agenda
    3. Overview of the recommendations and outcomes of previous NPFC meetings relevant to chub mackerel
     
    3.1 SC10
    4. Members fishery status and research activities
    5. Review of stock assessment for CM
     
    5.1 Member’s stock assessment
     
    5.2 2025 stock assessment by TWG CMSA
    6. Update of biological information
     
    6.1 Maturity-at-age and natural mortalities
     
    6.2 Finalization of biological parameters for stock assessment in TWG CMSA13
    7. Fishery and biological data for stock assessment
     
    7.1 Catch-at-age
     
     
    7.1.1 Length frequency, catch-at-length/size and age-length key
     
     
    7.1.2 Calculation of catch-at-age
     
    7.2 Weight-at-age
     
    7.3 Finalization of fishery and biological data for stock assessment in TWG CMSA13
    8. Abundance indices
     
    8.1 Update of abundance indices submitted by Members
     
    8.2 Usage of abundance indices in the 2026 stock assessment
     
    8.3 Finalization of abundance indices for stock assessment in TWG CMSA13
    9. Settings and specifications of SAM
     
    9.1 Review of current settings and specifications
     
    9.2 Discussion towards finalization of settings and specifications
    10. Biological reference points
     
    10.1 Methods to calculate biological reference points
     
    10.2 List of reference points for stock assessment in TWG CMSA13
    11. Future projection of chub mackerel
     
    11.1 Methods to conduct future projection
    12. Follow-up on tasking for TWG CMSA
     
    12.1 Task 1: Gear-specific catch-at-age/catch-at-length data
     
    12.2 Task 2: Fishing days and comparability of fishing effort among Members
    13. Future tasks for improving CM stock assessment, reference points and future projections
    14. Other matters
     
    14.1 Data call
     
    14.2 Activities and timeline
     
    14.3 Other issues
    15. Close of the Meeting
    No documents listed
    NPFC-2026-TWG CMSA12-MIP02 (Rev. 1)
    		Agenda NPFC-2026-TWG CMSA12-MIP02(Rev1) Provisional Agenda.pdf216.78 KB
    No documents listed
    3.1 SC10
    No documents listed
    NPFC-2026-TWG CMSA12-IP02
    		Chub Mackerel Catch in Canada (updated for 2026) NPFC-2026-TWG CMSA12-IP02 ChubMackerelCatchCanada2026.pdf396.16 KB
    No documents listed
    5.1 Member’s stock assessment
    No documents listed
    5.2 2025 stock assessment by TWG CMSA
    No documents listed
    No documents listed
    6.1 Maturity-at-age and natural mortalities
    No documents listed
    6.2 Finalization of biological parameters for stock assessment in TWG CMSA13
    No documents listed
    No documents listed
    7.1 Catch-at-age
    NPFC-2026-TWG CMSA12-WP03
    		The estimation method and data on catch, weight, and maturity at age of the chub mackerel caught by Japan up to CY2026/Q2 NPFC-2026-TWG CMSA12-WP03_Catch-at-age_Jpn_CY2026Q2.docx2.84 MB
    7.1.1 Length frequency, catch-at-length/size and age-length key
    No documents listed
    7.1.2 Calculation of catch-at-age
    No documents listed
    7.2 Weight-at-age
    No documents listed
    7.3 Finalization of fishery and biological data for stock assessment in TWG CMSA13
    No documents listed
    No documents listed
    8.1 Update of abundance indices submitted by Members
    NPFC-2026-TWG CMSA12-WP01
    		Standardized CPUE of Chub mackerel (Scomber japonicas) caught by the China’s lighting purse seine fishery up to 2025 NPFC-2026-TWG CMSA12-WP01 CM fishery CPUE Standardized up to 2025_CHN.pdf3.18 MB
    NPFC-2026-TWG CMSA12-WP02
    		Standardized CPUE of chub mackerel (Scomber japonicus) from the RV Songhang trawl survey in the Northwest Pacific Ocean, 2021– 2026 NPFC-2026-TWG CMSA12-WP02 CM survey CPUE standardized up to 2026_CHN.pdf1.5 MB
    NPFC-2026-TWG CMSA12-WP04
    		Standardized abundance index for recruitment of chub mackerel from Northwest Pacific summer surveys up to 2026 NPFC-2026-TWG CMSA12-WP04_SummerSurvey_Jpn.docx4.44 MB
    NPFC-2026-TWG CMSA12-WP05
    		Standardized CPUE of Japanese commercial dip-net fishery targeting spawners of chub mackerel in the Northwest Pacific up to 2026 NPFC-2026-TWG CMSA12-WP05_DipNetCPUE_Jpn.docx2.91 MB
    NPFC-2026-TWG CMSA12-WP06
    		Standardized Abundance Indices for Age-0 and Age-1 Fish of Chub Mackerel from Northwest Pacific Autumn Surveys up to 2026
    8.2 Usage of abundance indices in the 2026 stock assessment
    No documents listed
    8.3 Finalization of abundance indices for stock assessment in TWG CMSA13
    No documents listed
    No documents listed
    9.1 Review of current settings and specifications
    No documents listed
    9.2 Discussion towards finalization of settings and specifications
    No documents listed
    No documents listed
    10.1 Methods to calculate biological reference points
    No documents listed
    10.2 List of reference points for stock assessment in TWG CMSA13
    No documents listed
    No documents listed
    11.1 Methods to conduct future projection
    No documents listed
    No documents listed
    12.1 Task 1: Gear-specific catch-at-age/catch-at-length data
    No documents listed
    12.2 Task 2: Fishing days and comparability of fishing effort among Members
    No documents listed
    No documents listed
    No documents listed
    14.1 Data call
    NPFC-2027-SC11-IP01 (Rev. 7)
    		Scientific Committee Data Call – 2026/2027 NPFC-2027-SC11-IP01(Rev7) SC data call 2026-2027.docx255.83 KB
    14.2 Activities and timeline
    NPFC-2026-TWG CMSA12-IP01
    		TWG CMSA intersessional activities and timelines for the 2026 operational year NPFC-2026-TWG CMSA12-IP01 Activities and timelines for TWG CMSA.docx182.8 KB
    14.3 Other issues
    No documents listed
    No documents listed
    Document Number Title File Created
    NPFC-2026-TWG CMSA12-MIP02 (Rev. 1) Agenda NPFC-2026-TWG CMSA12-MIP02(Rev1) Provisional Agenda.pdf216.78 KB
    NPFC-2026-TWG CMSA12-WP01 Standardized CPUE of Chub mackerel (Scomber japonicas) caught by the China’s lighting purse seine fishery up to 2025 NPFC-2026-TWG CMSA12-WP01 CM fishery CPUE Standardized up to 2025_CHN.pdf3.18 MB
    NPFC-2026-TWG CMSA12-WP02 Standardized CPUE of chub mackerel (Scomber japonicus) from the RV Songhang trawl survey in the Northwest Pacific Ocean, 2021– 2026 NPFC-2026-TWG CMSA12-WP02 CM survey CPUE standardized up to 2026_CHN.pdf1.5 MB
    NPFC-2026-TWG CMSA12-WP03 The estimation method and data on catch, weight, and maturity at age of the chub mackerel caught by Japan up to CY2026/Q2 NPFC-2026-TWG CMSA12-WP03_Catch-at-age_Jpn_CY2026Q2.docx2.84 MB
    NPFC-2026-TWG CMSA12-WP04 Standardized abundance index for recruitment of chub mackerel from Northwest Pacific summer surveys up to 2026 NPFC-2026-TWG CMSA12-WP04_SummerSurvey_Jpn.docx4.44 MB
    NPFC-2026-TWG CMSA12-WP05 Standardized CPUE of Japanese commercial dip-net fishery targeting spawners of chub mackerel in the Northwest Pacific up to 2026 NPFC-2026-TWG CMSA12-WP05_DipNetCPUE_Jpn.docx2.91 MB
    NPFC-2026-TWG CMSA12-WP06 Standardized Abundance Indices for Age-0 and Age-1 Fish of Chub Mackerel from Northwest Pacific Autumn Surveys up to 2026
    NPFC-2026-TWG CMSA12-IP01 TWG CMSA intersessional activities and timelines for the 2026 operational year NPFC-2026-TWG CMSA12-IP01 Activities and timelines for TWG CMSA.docx182.8 KB
    NPFC-2027-SC11-IP01 (Rev. 7) Scientific Committee Data Call – 2026/2027 NPFC-2027-SC11-IP01(Rev7) SC data call 2026-2027.docx255.83 KB
    NPFC-2026-TWG CMSA12-IP02 Chub Mackerel Catch in Canada (updated for 2026) NPFC-2026-TWG CMSA12-IP02 ChubMackerelCatchCanada2026.pdf396.16 KB