Relative abundance, size and age structure, and stock status of blue cod off Kaikoura and north Canterbury in 2011–12. Comparisons of potting survey designs and 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: 2018/06.Publisher: Wellington : Ministry for Primary Industries, 2018.Description: 1 online resource : colour illustrations.ISBN: 9781776658350 (online).Subject(s): PARAPERCIS COLIAS | BLUE COD | COD | FISHERIES | FISHERY STATISTICS | NEW ZEALAND | FISH STOCK ASSESSMENT | FISH POPULATIONS | KAIKOURA | NORTH CANTERBURYHoldings: ELECTRONIC Online resources: FAR 2018/06 Fisheries Infosite | Relative abundance, size and age structure, and stock status of blue cod off Kaikoura and north Canterbury in 2011–12. Comparisons of potting survey designs and estimates of pot catchability and size selectivity NIWA document server Summary: Third fixed, first random site potting surveys in the time series. Eighty-eight sites surveyed, 6 pots per site, 528 pot lifts. Pot catch weighed, length and sex of blue cod recorded. Otoliths age-length keys applied to the scaled length frequency distributions to estimate population age structures. Estimates of Z and F%SPR indicate spawning biomass has been reduced to 52% in Kaikoura and 44-45% in Motanau. Density estimates from video transects had only a poor relationship with pot catches.
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"May 2018".

Includes bibliographical references.

Third fixed, first random site potting surveys in the time series. Eighty-eight sites surveyed, 6 pots per site, 528 pot lifts. Pot catch weighed, length and sex of blue cod recorded. Otoliths age-length keys applied to the scaled length frequency distributions to estimate population age structures. Estimates of Z and F%SPR indicate spawning biomass has been reduced to 52% in Kaikoura and 44-45% in Motanau. Density estimates from video transects had only a poor relationship with pot catches.

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