Updated 2016 Nightingale island rock lobster assessment

 

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dc.contributor.author Johnston, Susan
dc.contributor.author Butterworth, Doug
dc.date.accessioned 2017-02-20T13:15:10Z
dc.date.available 2017-02-20T13:15:10Z
dc.date.issued 2016-06
dc.identifier.citation Johnston, S.J. and Butterworth, D.S. 2016. Updated 2016 Nightingale island rock lobster assessment. MARAM document: MARAM/TRISTAN/2016/JUN/10: 21pp. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/23985
dc.description.abstract This paper provides an updated assessment of the rock lobster resource at Nightingale island. This assessment includes updated data from both the commercial fishery and the biomass surveys. The recent (2013-2015) high GLM standardised CPUE values (and biomass survey index values) at the island were not initially anticipated, and suggest that the impact of the OLIVA on adults may have been overestimated. The recent high CPUE indicates that the adult mortality in 2011 due to the OLIVA incident was much less than originally assumed. The 2016 RC assessment thus now assumes zero adult mortality in 2011 due to the OLIVA incident, but continues to assume an 80% juvenile mortality due to this incident in 2011. Projections suggest that the resource could readily sustain future constant catches at 75 MT, though there may be a brief downturn in catch rates shortly if the OLIVA incident led to a high mortality of juveniles at that time. en_ZA
dc.language eng en_ZA
dc.title Updated 2016 Nightingale island rock lobster assessment en_ZA
dc.type Working Paper en_ZA
uct.type.publication Research en_ZA
uct.type.resource Discussion paper en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Marine Resource Assessment and Management Group en_ZA
uct.type.filetype Text
uct.type.filetype Image


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