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Assessing the stock status of holobenthic octopus fisheries: is catch per unit effort sufficient?

Leporati, S, Ziegler, PE and Semmens, JM 2009 , 'Assessing the stock status of holobenthic octopus fisheries: is catch per unit effort sufficient?' , ICES Journal of Marine Science, vol. 66, no. 3 , pp. 478-487 , doi:

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Holobenthic and merobenthic octopus fisheries are commonly treated as biological equivalents, regardless of their contrasting life-
history strategies. This is the consequence of a lack of species identification and relevant biological information for many species,
which has led to a reliance on catch per unit effort (cpue) data for stock status assessments. Using the commercial Octopus pallidus
fishery in southeast Australian waters as a case study, the reliability of commercial cpue data as an indicator of stock status for holo-
benthic octopus fisheries was assessed. To achieve this, cpue and biological information from a fixed position experimental research
line were investigated for consistency in stock status patterns and compared with commercial fishery cpue trends. Research line results
revealed that cpue could remain stable regardless of size-selective fishing mortality potentially impacting recruitment. The cpue in the
commercial fishery was very seasonal and dominated by females during autumn, when both cpue and spawning periods peaked, so
increasing the potential for negative fishery impacts on egg production. The inability of cpue to account for the effects of continual
fishing pressure on recruitment or seasonal changes in sex-specific catchability, however, indicates that cpue alone cannot provide
sufficient information on the status of a holobenthic octopus fishery.

Item Type: Article
Authors/Creators:Leporati, S and Ziegler, PE and Semmens, JM
Keywords: catch per unit effort, effects of fishing, octopus, recruitment, season
Journal or Publication Title: ICES Journal of Marine Science
ISSN: 1054-3139
DOI / ID Number:
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Copyright © 2009 Oxford University Press

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