Effect of missing values from the Canadian spring and fall surveys of NAFO Divisions 3LNO on the calculation of the TAC using the Greenland halibut HCR

dc.contributor.authorRegular, P M
dc.contributor.authorButterworth, Douglas
dc.contributor.authorRademeyer, Rebecca
dc.date.accessioned2023-08-17T10:29:20Z
dc.date.available2023-08-17T10:29:20Z
dc.date.issued2022
dc.description.abstractTo test the impact of ignoring recent missing abundance indices for Greenland Halibut in NAFO divisions 2+3KLMNO on applying the accepted HCR for this population to provide a TAC recommendation for 2023, the impact of similar exclusions in the past is examined and found to be small. To further test of the impact of the missing 2021 index from the Canada Fall 3LNO survey, a range of pessimistic to optimistic abundance index values were assumed to assess the plausible range of impact this one value might have on the TAC computation. The range of the resultant TACs is small, and the difference of the impact of TACs at either end of this range on exploitable biomass projections for the next year is found to be negligible. Hence, it is argued, the minimalist and straightforward approach of simply ignoring the missing 2021 Canadian Fall 3LNO result in the four-survey version of the HCR agreed last year would be a defensible and appropriate approach to the required adjustment of the implementation of this HCR to provide a TAC recommendation for 2023.en_US
dc.identifier.apacitationRegular, P. M., Butterworth, D., & Rademeyer, R. (2022). <i>Effect of missing values from the Canadian spring and fall surveys of NAFO Divisions 3LNO on the calculation of the TAC using the Greenland halibut HCR</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics. Retrieved from http://hdl.handle.net/11427/38239en_ZA
dc.identifier.chicagocitationRegular, P M, Douglas Butterworth, and Rebecca Rademeyer <i>Effect of missing values from the Canadian spring and fall surveys of NAFO Divisions 3LNO on the calculation of the TAC using the Greenland halibut HCR.</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics, 2022. http://hdl.handle.net/11427/38239en_ZA
dc.identifier.citationRegular, P.M., Butterworth, D. & Rademeyer, R. 2022. <i>Effect of missing values from the Canadian spring and fall surveys of NAFO Divisions 3LNO on the calculation of the TAC using the Greenland halibut HCR</i>. ,Faculty of Science ,Department of Mathematics and Applied Mathematics. http://hdl.handle.net/11427/38239 .en_ZA
dc.identifier.ris TY - Report AU - Regular, P M AU - Butterworth, Douglas AU - Rademeyer, Rebecca AB - To test the impact of ignoring recent missing abundance indices for Greenland Halibut in NAFO divisions 2+3KLMNO on applying the accepted HCR for this population to provide a TAC recommendation for 2023, the impact of similar exclusions in the past is examined and found to be small. To further test of the impact of the missing 2021 index from the Canada Fall 3LNO survey, a range of pessimistic to optimistic abundance index values were assumed to assess the plausible range of impact this one value might have on the TAC computation. The range of the resultant TACs is small, and the difference of the impact of TACs at either end of this range on exploitable biomass projections for the next year is found to be negligible. Hence, it is argued, the minimalist and straightforward approach of simply ignoring the missing 2021 Canadian Fall 3LNO result in the four-survey version of the HCR agreed last year would be a defensible and appropriate approach to the required adjustment of the implementation of this HCR to provide a TAC recommendation for 2023. DA - 2022 DB - OpenUCT DP - University of Cape Town KW - Greenland halibut KW - Missing surveys KW - NAFO KW - TAC LK - https://open.uct.ac.za PY - 2022 T1 - Effect of missing values from the Canadian spring and fall surveys of NAFO Divisions 3LNO on the calculation of the TAC using the Greenland halibut HCR TI - Effect of missing values from the Canadian spring and fall surveys of NAFO Divisions 3LNO on the calculation of the TAC using the Greenland halibut HCR UR - http://hdl.handle.net/11427/38239 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/38239
dc.identifier.vancouvercitationRegular PM, Butterworth D, Rademeyer R. Effect of missing values from the Canadian spring and fall surveys of NAFO Divisions 3LNO on the calculation of the TAC using the Greenland halibut HCR. 2022 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/38239en_ZA
dc.publisher.departmentDepartment of Mathematics and Applied Mathematicsen_US
dc.publisher.facultyFaculty of Scienceen_US
dc.subjectGreenland halibuten_US
dc.subjectMissing surveysen_US
dc.subjectNAFOen_US
dc.subjectTACen_US
dc.titleEffect of missing values from the Canadian spring and fall surveys of NAFO Divisions 3LNO on the calculation of the TAC using the Greenland halibut HCRen_US
dc.typeReporten_US
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