Modelling the effect of marine reserves on the recreational shore-fishery of the South-Western Cape, South Africa
- 1 December 1995
- journal article
- Published by National Inquiry Services Center (NISC) in South African Journal of Marine Science
- Vol. 16 (1) , 227-240
- https://doi.org/10.2989/025776195784156458
Abstract
A discrete, space-time, age-structured model of a fishery was developed to test the effect of marine reserves on yield of fish to recreational angling. The model was applied to three sympatric surf-zone species commonly targeted by shore-anglers. Movement rates of white steenbras Lithognathus lithognathus and galjoen Dichistius capensis, both of which are nomadic, were estimated from tag-recovery data. Because post-recruit blacktail Diplodus Sargus capensis are resident, a coefficient of passive larval diffusion was estimated from drogue-separation rates. Marine reserves cannot increase the yield-per-recruit of white steenbras, although the spawner-biomass-per-recruit responds positively. A "recruitment - spawner-biomass" function was applied to galjoen and blacktail. The yield of galjoen increased sharply as the size of area conserved increased. Small reserves, closely spaced, appeared to be optimal for blacktail. A range of reserve size and spacing combinations satisfied management criteria for the thre...This publication has 0 references indexed in Scilit: