Download FAR 2018/07 – Relative abundance, population structure, and stock status of blue cod off north Otago in 2013. Concurrent fixed and random site potting surveys
Third fixed and first random site potting surveys in north Otago time series. Twenty-seven fixed and 40 random sites surveyed (6 pots per site, 402 pot lifts) from 4 coastal and 2 offshore strata. Pot catch weighed, length and sex of blue cod recorded. Otoliths from random and fixed sites produced age-length keys applied to the scaled length frequency distributions to estimate the population age structures. Estimates of Z and F%SPR indicate that spawning biomass has been reduced to 34-36%.
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