Second random site potting surveys in the time series. Forty potting sites surveyed (6 pots per site = 240 pot lifts) from six strata. Pot catch weighed, length and sex of blue cod recorded. Otoliths age-length keys applied to the scaled length frequency distributions estimate population age structures. Estimates of Z and F%SPR indicate spawning biomass reduced to 57% (inshore) and 74% (offshore). Density/pot catch relationships differ among areas imply pot catchability is spatially variable.
FAR 2018/08 – Relative abundance, population structure, and stock status of blue cod off south Otago in 2013. Estimates of pot catchability and size selectivity
Report - Fisheries Assessment Report (FAR)
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