Articles by Author: Aj Booth

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  1. A BROWN-McCOY RADICAL FOR T-RINGS

    A BROWN-McCOY RADICAL FOR T-RINGS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    A notion of G-regularity is introduced for a Γ-ring M, and from this notion a Brown-McCoy radical, B(M) is defined. B(M) is shown to be a radical in the sense of Kurosh and Amitsur, and analogies of various well-known results...
  2. Biology of the redspotted tonguesole <em>Cynoglossus zanzibarensis</em> (Pleuronectiformes: Cynoglossidae) on the Agulhas Bank, South Africa

    Biology of the redspotted tonguesole <em>Cynoglossus zanzibarensis</em> (Pleuronectiformes: Cynoglossidae) on the Agulhas Bank, South Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The biology of the redspotted tonguesole Cynoglossus zanzibarensis, a common African cynoglossid inhabiting the Agulhas Bank, South Africa, is described. Growth studies based on sectioned sagittal otoliths revealed that C. zanzibarensis is relatively fast-growing and long-lived, attaining ages >8 years...
  3. Assessment of the monkfish <em>Lophius vomerinus</em> resource off Namibia

    Assessment of the monkfish <em>Lophius vomerinus</em> resource off Namibia

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The Lophius vomerinus component of the monkfish resource off Namibia was assessed by means of deterministic length- and age-based models. Steady state length cohort analyses illustrated that, although the model was sensitive to the rate of natural mortality, it was...
  4. Quantifying commercial catch and effort of monkfish <em>Lophius vomerinus</em> and <em>L. vaillanti</em> off Namibia

    Quantifying commercial catch and effort of monkfish <em>Lophius vomerinus</em> and <em>L. vaillanti</em> off Namibia

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Abundance and exploitation patterns of monkfish Lophius vomerinus and L. vaillanti were investigated for use as inputs into a stock assessment framework to be used for management of the Namibian monkfish resource. Total numbers of monkfish caught per size-class were...
  5. Changes in the Eastern Cape demersal inshore trawl fishery between 1967 and 1995

    Changes in the Eastern Cape demersal inshore trawl fishery between 1967 and 1995

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Changes in the Eastern Cape demersal inshore trawl fishery operating out of Port Elizabeth over a 28-year period from 1967 to 1995 are described. The fishery is restricted to vessels operating between Slangbaai in the west to Port Alfred in...
  6. Considerations on the feasibility of a directed fishery for panga <em>Pterogymnus lantartus</em> (Pisces: Sparidae)

    Considerations on the feasibility of a directed fishery for panga <em>Pterogymnus lantartus</em> (Pisces: Sparidae)

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Recent assessments of the status of the panga Pterogymnus laniarius stock on the Agulhas Bank, South Africa, showed that catches could be sustained at considerably higher levels than those harvested at present. Although the stock could be successfully harvested using...
  7. Mapping spaces and homotopy theory

    Mapping spaces and homotopy theory

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    Let q : Y → B be a map (= continuous function) and Z be a space. We will use Y ! Z to denote a set of partial maps from Y to Z, i.e.those such maps whose domains are...