Articles by Author: Wm Potts

Search results for Wm Potts

We found 25 results for you
  1. Reproductive biology of a riverine cyprinid, <em>Labeo umbratus</em> (Teleostei: Cyprinidae), in small South African reservoirs

    Reproductive biology of a riverine cyprinid, <em>Labeo umbratus</em> (Teleostei: Cyprinidae), in small South African reservoirs

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The reproductive and recruitment characteristics of moggel, Labeo umbratus, populations were examined in four small South African reservoirs. Reproduction, characterised by an extended spawning season, high fecundity, short incubation time and rapid larval development, appears to be ideally suited to...
  2. Predictor variables for moggel (<em>Labeo umbratus</em>) biomass and production in small South African reservoirs

    Predictor variables for moggel (<em>Labeo umbratus</em>) biomass and production in small South African reservoirs

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The biomass and production of moggel, Labeo umbratus, in five small previously unexploited Eastern Cape reservoirs were estimated and related to environmental conditions. Biomass and production estimates varied widely between the reservoirs. Whilst the production/biomass ratio was not a good...
  3. The life history and fishery potential of <em>Labeo umbratus</em> (Teleostei: Cyprinidae) in five small South African reservoirs

    The life history and fishery potential of <em>Labeo umbratus</em> (Teleostei: Cyprinidae) in five small South African reservoirs

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The life histories of five populations of moggel, Labeo umbratus, inhabiting small Eastern Cape reservoirs were compared and the differences related to environmental parameters. A significant positive correlation between fish growth and chlorophyll a was noted in four cases. In...
  4. Validation of the periodicity of opaque zone formation in the otoliths of four temperate reef fish from South Africa

    Validation of the periodicity of opaque zone formation in the otoliths of four temperate reef fish from South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    An oxytetracycline (OTC) marker was used to validate the periodicity of opaque zone deposition in the otoliths of Chrysoblephus laticeps, Cheimerius nufar, Cymatoceps nasutus (Sparidae) and Dichistius capensis (Dichistiidae) in the wild. Fish were injected with OTC and tagged with...
  5. The biology, life history and management needs of a large sciaenid fish, <em>Argyrosomus coronus</em>, in Angola

    The biology, life history and management needs of a large sciaenid fish, <em>Argyrosomus coronus</em>, in Angola

    Item type: Journal Article • Journal: African Journal of Marine Science
    The West Coast dusky kob Argyrosomus coronus is an understudied yet important fishery species in Angola. During a five-year study (2005–2009), the species was recorded in all fishery sectors, but was most important in the inshore recreational fishery in southern...
  6. Aspects of the biology and fisheries of an economically important sparid <em>Dentex macrophthalmus</em> (Bloch 1791) in the Namibe province, Angola

    Aspects of the biology and fisheries of an economically important sparid <em>Dentex macrophthalmus</em> (Bloch 1791) in the Namibe province, Angola

    Item type: Journal Article • Journal: African Journal of Marine Science
    The sparid Dentex macrophthalmus is a widespread, important fishery species along most of the West African coast from southern Namibia to the Mediterranean. In southern Angola it is an important artisanal species targeted predominantly by handline fishers. A biological and...
  7. Assessment of current data for the octopus resource in Rodrigues, western Indian Ocean

    Assessment of current data for the octopus resource in Rodrigues, western Indian Ocean

    Item type: Journal Article • Journal: African Journal of Marine Science
    The annual catch of octopus in the Rodrigues Lagoon, located east/north-east of Mauritius, has dropped by almost half since 1994. This has prompted concern over the resource and has initiated an assessment of the current status of the stock. The...
  8. Comparison of the population structure and life-history parameters of <em>Diplodus capensis</em> (Sparidae) in exploited and unexploited areas of southern Angola

    Comparison of the population structure and life-history parameters of <em>Diplodus capensis</em> (Sparidae) in exploited and unexploited areas of southern Angola

    Item type: Journal Article • Journal: African Journal of Marine Science
    Blacktail seabream Diplodus capensis were sampled from proximate (10 km apart) exploited and unexploited areas in southern Angola to compare their population structures and life-history parameters. Females dominated the larger size and older age classes in the unexploited area. In...
  9. The reproductive style of <em>Diplodus capensis</em> (Sparidae) in southern Angola: rudimentary hermaphroditism or partial protandry?

    The reproductive style of <em>Diplodus capensis</em> (Sparidae) in southern Angola: rudimentary hermaphroditism or partial protandry?

    Item type: Journal Article • Journal: African Journal of Marine Science
    The reproductive style of Diplodus capensis was examined in an unexploited coastal area in southern Angola. The mean length of females was significantly greater than that of males and, although not significant, females dominated the older age classes. The overall...
  10. Temporal variability of a temperate fish assemblage in Africa's oldest marine protected area

    Temporal variability of a temperate fish assemblage in Africa's oldest marine protected area

    Item type: Journal Article • Journal: African Journal of Marine Science
    A standardised research-based, shore-angling survey was conducted in the 47-year-old Tsitsikamma National Park Marine Protected Area (MPA) between 1998 and 2005. The aim of this study was to examine variability in community structure, relative abundance (catch per unit effort, CPUE)...