2018 Updated horse mackerel assessments

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dc.contributor.authorJohnston, Susan
dc.contributor.authorButterworth, Doug S
dc.date.accessioned2019-11-19T14:06:45Z
dc.date.available2019-11-19T14:06:45Z
dc.date.issued2018-10
dc.description.abstractThe assessments for the two hypotheses (reduced catchability and a one-off additional mortality event) for the recent reduced Desert Diamond catch rate are updated to take one further year’s data into account. The 2017 CPUE somewhat increased above its 2016 value, and now almost returned to the values typical before the 2014 low. If the same basis as in the recent past is used to make management recommendations with an unchanged effort limitation, the total allowable midwater catch would be set at 23 851 MT. However the assessment results, given this data update, are suggestive of the catchability hypothesis now being more plausible than the additional mortality hypothesis. This in turn suggests that consideration should be given to some increase in the cap on effort, which would lead to a concomitant increase in the midwater TAC.en_US
dc.identifier.apacitationJohnston, S., & Butterworth, D. (2018). <i>2018 Updated horse mackerel assessments</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics. Retrieved from http://hdl.handle.net/11427/30650en_ZA
dc.identifier.chicagocitationJohnston, Susan, and Doug Butterworth <i>2018 Updated horse mackerel assessments.</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics, 2018. http://hdl.handle.net/11427/30650en_ZA
dc.identifier.citationJohnston, S., Butterworth, D. 2018-10. 2018 Updated horse mackerel assessments.en_ZA
dc.identifier.ris TY - Report AU - Johnston, Susan AU - Butterworth, Doug AB - The assessments for the two hypotheses (reduced catchability and a one-off additional mortality event) for the recent reduced Desert Diamond catch rate are updated to take one further year’s data into account. The 2017 CPUE somewhat increased above its 2016 value, and now almost returned to the values typical before the 2014 low. If the same basis as in the recent past is used to make management recommendations with an unchanged effort limitation, the total allowable midwater catch would be set at 23 851 MT. However the assessment results, given this data update, are suggestive of the catchability hypothesis now being more plausible than the additional mortality hypothesis. This in turn suggests that consideration should be given to some increase in the cap on effort, which would lead to a concomitant increase in the midwater TAC. DA - 2018-10 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PY - 2018 T1 - 2018 Updated horse mackerel assessments TI - 2018 Updated horse mackerel assessments UR - http://hdl.handle.net/11427/30650 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/30650
dc.identifier.vancouvercitationJohnston S, Butterworth D. 2018 Updated horse mackerel assessments. 2018 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/30650en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Mathematics and Applied Mathematicsen_US
dc.publisher.facultyFaculty of Scienceen_US
dc.title2018 Updated horse mackerel assessmentsen_US
dc.typeReporten_US
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