A computer simulation of the population dynamics of the Cape hakes (Merluccius capensis and M. paradoxus)

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dc.contributor.advisorField, John Gen_ZA
dc.contributor.advisorNewman , G Gen_ZA
dc.contributor.authorMertens, Robert George Stephenen_ZA
dc.date.accessioned2015-03-16T10:30:35Z
dc.date.available2015-03-16T10:30:35Z
dc.date.issued1978en_ZA
dc.descriptionIncludes bibliographical references (leaves 63-68).en_ZA
dc.description.abstractCatch and effort statistics for the Cape hakes (Merluccius capensis and M. paradoxus) have indicated a substantial decrease in the stock size over the period 1955-74; consequently, a catch projection model was designed to investigate the hake population. Where appropriate, available data have been included in the model; however, some further research was required: 1. The monthly pattern of availability for 1974-76 was examined using South African data; it was found to be similar to that reported for earlier years, and the later figures were used. 2. Assuming that selection curves for different mesh sizes are identical except for their position on the X-axis, a method to calculate selection values for combinations of mesh size and fish length has been outlined, and used with data presented by Bohl et al. (1971). 3. An investigation was made of two methods of estimating natural mortality (M), utilizing the results of Virtual Population Analysis (V.P.A.). In both cases the criteria used to judge M were found to be insensitive, and therefore neither can be used. 4. The stock estimates obtained using V.P.A. were applied to two stock/recruit curves. The goodness of fit in both cases was poor, and nearly identical.en_ZA
dc.identifier.apacitationMertens, R. G. S. (1978). <i>A computer simulation of the population dynamics of the Cape hakes (Merluccius capensis and M. paradoxus)</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/12613en_ZA
dc.identifier.chicagocitationMertens, Robert George Stephen. <i>"A computer simulation of the population dynamics of the Cape hakes (Merluccius capensis and M. paradoxus)."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1978. http://hdl.handle.net/11427/12613en_ZA
dc.identifier.citationMertens, R. 1978. A computer simulation of the population dynamics of the Cape hakes (Merluccius capensis and M. paradoxus). University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Mertens, Robert George Stephen AB - Catch and effort statistics for the Cape hakes (Merluccius capensis and M. paradoxus) have indicated a substantial decrease in the stock size over the period 1955-74; consequently, a catch projection model was designed to investigate the hake population. Where appropriate, available data have been included in the model; however, some further research was required: 1. The monthly pattern of availability for 1974-76 was examined using South African data; it was found to be similar to that reported for earlier years, and the later figures were used. 2. Assuming that selection curves for different mesh sizes are identical except for their position on the X-axis, a method to calculate selection values for combinations of mesh size and fish length has been outlined, and used with data presented by Bohl et al. (1971). 3. An investigation was made of two methods of estimating natural mortality (M), utilizing the results of Virtual Population Analysis (V.P.A.). In both cases the criteria used to judge M were found to be insensitive, and therefore neither can be used. 4. The stock estimates obtained using V.P.A. were applied to two stock/recruit curves. The goodness of fit in both cases was poor, and nearly identical. DA - 1978 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1978 T1 - A computer simulation of the population dynamics of the Cape hakes (Merluccius capensis and M. paradoxus) TI - A computer simulation of the population dynamics of the Cape hakes (Merluccius capensis and M. paradoxus) UR - http://hdl.handle.net/11427/12613 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/12613
dc.identifier.vancouvercitationMertens RGS. A computer simulation of the population dynamics of the Cape hakes (Merluccius capensis and M. paradoxus). [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1978 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/12613en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Biological Sciencesen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherZoologyen_ZA
dc.titleA computer simulation of the population dynamics of the Cape hakes (Merluccius capensis and M. paradoxus)en_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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