Development and evaluation of catch per unit effort indices for southern blue whiting (Micromesistius australis) on the Campbell Island Rise, New Zealand

This paper develops standardized commercial cpue indices for a highly aggregated spawning fishery in New Zealand waters, and verifies the indices using fishery-independent data. Indices were calculated for all vessels using three different measures of effort, and for vessel subsets based on processi...

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Bibliographic Details
Published in:ICES journal of marine science 2005, Vol.62 (6), p.1131-1138
Main Authors: Hanchet, Stuart M., Blackwell, Ron G., Dunn, Alistair
Format: Article
Language:English
Subjects:
fishery-independent
fishing strategies
Marine
Micromesistius australis
southern blue whiting
standardized cpue
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Summary:This paper develops standardized commercial cpue indices for a highly aggregated spawning fishery in New Zealand waters, and verifies the indices using fishery-independent data. Indices were calculated for all vessels using three different measures of effort, and for vessel subsets based on processing type (surimi and dressed), and relative experience in the fishery. Trends in cpue were consistent with trends in fishery-independent acoustic surveys, age composition of the commercial catch, and recent stock assessment results. In particular, the cpue indices tracked the more than fourfold increase in abundance from 1993 to 1996 associated with the recruitment of the strong 1991 year class, and the decline in relative abundance as this year class was fished down. Despite this being a highly aggregated spawning fishery, there was little evidence for hyperstability. There were also significant differences in fishing strategies of the fleets between periods of high and low fish abundance.
ISSN:1054-3139
1095-9289
DOI:10.1016/j.icesjms.2005.04.011