Original Articles

Some considerations for the management in South Africa of galjoen coracinus capensis (Cuvier), an important shore-angling species off the South-Western Cape

Published in: South African Journal of Marine Science
Volume 6, issue 1, 1988 , pages: 133–142
DOI: 10.2989/025776188784480627
Author(s): B. A. Bennett

Abstract

Information pertinent to the management of galjoen Coracinus capensis is presented and used to assess the current catch restrictions and to suggest possible alternatives. The commercial catch increased from ± 10 tons in 1900 to 70 tons in 1940 when the data series was terminated. Between 10 and 70 per cent (27,5 per cent overall) of the total recorded number offish taken by sport anglers since 1938 were galjoen, and they were caught at a rate of 2–7 fish·100 h−1 and averaged between 950 and 1 400 g. Male and female stocks are assessed separately because they differed significantly in terms of numbers, size and rate of growth. The responses of yield per recruit (Y/R), spawning biomass per recruit (SB/R) and mean mass (W) to changing values of fishing (F) and natural (M) mortality and age at first capture (tc ) are modelled. The results reveal that the female stock is probably oyerexploited whereas the male stock is not and that, although sensitive to changes in tc and M, Y/R, SB/R and W are relatively unaffected by changes in F. Three management options are evaluated, and it is concluded that, given the limitations of the information available and that likely to be obtained in the near future, the present management package is probably the best compromise.

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