Stock Size and Stock Density

Rögnvaldur Hannesson

Marine Resource Economics, 2024, vol. 39, issue 3, 229 - 242

Abstract: The Gordon-Schaefer production function is widely used in theoretical and empirical analysis of fisheries and implies a strict proportionality between stock size and density. Yet it has long been known that this is a special case that is highly unlikely to hold for pelagic stocks. For demersal stocks it is more likely to hold, but the relationship between the density of fish and stock size may well be more complicated than implied by this equation. We examine the relationship between stock size and stock density, using data on fish catches and fuel use for Norwegian fishing boats. We find that stock density is unrelated or only weakly related to stock size for pelagic stocks, while for demersal stocks there is a significant relation between size and density, although it is not necessarily strictly proportional.

Date: 2024
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