Abstract
The stock densities, larval abundances and mortality rates in the Downs stock were examined in the period 1955–1966. Stock densities and larval abundances have declined at about the same rate. Mortality rates have remained steady. Catches in the north-eastern and central North Sea have declined since 1960 at about the same rate as those in the southern North Sea. These facts are explicable if the Downs stock has declined due to recruitment failure and was formely the largest stock in the North Sea. The relation between recruitment and parent stock is shown to be near linear, which implies that the density dependent mortality is low.

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