Relative abundance, population structure, and stock status of blue cod off south Otago in 2013. Estimates of pot catchability and size selectivity / G. Carbines, V. Haist.

By: Carbines, Glen D. (Glen David), 1968- [author.].
Contributor(s): Haist, Vivian [author.] | New Zealand. Ministry for Primary Industries [issuing body.].
Material type: materialTypeLabelBookSeries: New Zealand Fisheries assessment report: 2018/08.Publisher: Wellington : Ministry for Primary Industries, 2018.Description: 1 online resource : colour illustrations.ISBN: 9781776658374 (online).Other title: BCO south Otago 2013 [Running title].Subject(s): PARAPERCIS COLIAS | BLUE COD | COD | FISHERIES | STATISTICS | NEW ZEALAND | SOUTH OTAGO | FISH STOCK ASSESSMENT | FISH POPULATIONSHoldings: ELECTRONIC Online resources: FAR 2018/08 Fisheries Infosite | Relative abundance, population structure, and stock status of blue cod off south Otago in 2013. Estimates of pot catchability and size selectivity NIWA document server Summary: 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.
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"May 2018".

Includes bibliographical references.

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.

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