Technical annex

DRAFT — for review

Jack mackerel assessment · Version 2 · Working results through 11 September 2026

The technical annex brings together the assessment data, model development, diagnostics, reference points and projections for Model 1.06. It covers both the single-stock and two-stock hypotheses. Its findings retain the working status stated in the report; agreed Scientific Committee advice follows the Committee's meeting record.

Read the annex

Read the draft technical annex online.

• Download the draft annex as PDF.
• Download the draft annex as Word.

The report explains the distinction between the long-term biomass target and precautionary projections. Its risk tables cover two, five and ten years after 2026. The saved assessment results and scientific content are the same as in the saved Version 2 package.

Understand and maintain the calculations

Read the analyst handover for a short explanation of the source files, R calculations, build commands and update steps.

• Download the handover as PDF.
• Download the handover as Word.
• Browse the editable report, R scripts and saved inputs.

The annex builds from saved assessment products using R and Quarto. The handover includes a worked example tracing a projection probability from spawning biomass, its standard error and the fixed biomass target.

Follow the source results

• Annual projection-risk data (CSV).
• Reference points and replacement diagnostics (CSV).
• Projection-run record (JSON).
• Publication file checksums (CSV).

Return to the assessment overview or use Search contents to find a topic within the annex and the rest of the wiki.