Aspects of the biology and population dynamics of the deep-water commercially exploited crabs off South West Africa/Namibia

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dc.contributor.advisorGriffiths, Charles Len_ZA
dc.contributor.authorMelville-Smith, Royen_ZA
dc.date.accessioned2016-01-12T11:27:57Z
dc.date.available2016-01-12T11:27:57Z
dc.date.issued1987en_ZA
dc.descriptionBibliography: pages 170-172.en_ZA
dc.description.abstractTwo crab species have been exploited on the South West African/ Namibian continental slope since 1973. The deep-sea red crab Geryon maritae forms >99 percent of the catch made by traps, the balance being a by-catch of stone crab Lithodes tropicalis. Historical information dating back to the late 1970's has been examined, but most of the data analysed in this study have been collected since 1980. Most of the research has been conducted on red crab. Four aspects of its biology have been examined in some detail, namely its reproduction, growth, movements and causes of its specific dep t h zonation off Namibia. These (particularly the first two) aspects have been used, together with information from commercial sampling and catch statistics, to examine possible changes in the yield-per-recruit should the age at first capture be increased, or fishing effort reduced. On the basis of these results, some management options are presented. Several techniques (photography, trawling, effective fishing area and tag-recapture) have been used to examine the abundance and density of red crab off Namibia, and are critically compared . Research on the stone crab has been largely restricted to an analysis of commercial catch data, though an unusual symbiotic relationship with a liparid fish has been identified and discussed.en_ZA
dc.identifier.apacitationMelville-Smith, R. (1987). <i>Aspects of the biology and population dynamics of the deep-water commercially exploited crabs off South West Africa/Namibia</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/16376en_ZA
dc.identifier.chicagocitationMelville-Smith, Roy. <i>"Aspects of the biology and population dynamics of the deep-water commercially exploited crabs off South West Africa/Namibia."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1987. http://hdl.handle.net/11427/16376en_ZA
dc.identifier.citationMelville-Smith, R. 1987. Aspects of the biology and population dynamics of the deep-water commercially exploited crabs off South West Africa/Namibia. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Melville-Smith, Roy AB - Two crab species have been exploited on the South West African/ Namibian continental slope since 1973. The deep-sea red crab Geryon maritae forms >99 percent of the catch made by traps, the balance being a by-catch of stone crab Lithodes tropicalis. Historical information dating back to the late 1970's has been examined, but most of the data analysed in this study have been collected since 1980. Most of the research has been conducted on red crab. Four aspects of its biology have been examined in some detail, namely its reproduction, growth, movements and causes of its specific dep t h zonation off Namibia. These (particularly the first two) aspects have been used, together with information from commercial sampling and catch statistics, to examine possible changes in the yield-per-recruit should the age at first capture be increased, or fishing effort reduced. On the basis of these results, some management options are presented. Several techniques (photography, trawling, effective fishing area and tag-recapture) have been used to examine the abundance and density of red crab off Namibia, and are critically compared . Research on the stone crab has been largely restricted to an analysis of commercial catch data, though an unusual symbiotic relationship with a liparid fish has been identified and discussed. DA - 1987 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1987 T1 - Aspects of the biology and population dynamics of the deep-water commercially exploited crabs off South West Africa/Namibia TI - Aspects of the biology and population dynamics of the deep-water commercially exploited crabs off South West Africa/Namibia UR - http://hdl.handle.net/11427/16376 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/16376
dc.identifier.vancouvercitationMelville-Smith R. Aspects of the biology and population dynamics of the deep-water commercially exploited crabs off South West Africa/Namibia. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1987 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/16376en_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.titleAspects of the biology and population dynamics of the deep-water commercially exploited crabs off South West Africa/Namibiaen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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