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LONGTERM EFFECTS OF CHANGES IN FISHING EFFORT AND MESH
COMMENTS ON LENGTH COHORT ANALYSIS
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age composition assumed average number Beverton and Holt Cadima calculated captured change in exploitation change in mesh CM CM cm length group codend displacement factor equation example is given F2At Figure fish stocks fishery fishing effort fishing mortality rate gear gill nets given in Table Gulland increase in mesh input data larger mesh length cohort analysis length composition analysis length composition data length interval long term effect mesh size mesh sizes method multispecies natural logarithms number of fish number of individuals numbers attaining numbers caught obtained oldest age group plotted procedure proportion retained rate of exploitation ratios relationship between length relative age representative required to grow rH CM samples selection curve selection ogives shows slope species standard deviation step stock assessment Table 24 total removals value of F value of F/Z value of Loo virtual population analysis weight year-class yield isopleth diagram younger ages