The egg production and spawning stock size of the North Sea mackerel stock in 1990
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During the period 12 March to 20 July 1990 the spawning area of the North Sea mackerel was investigated by research vessels from the Netherlands, Denmark and Norway. Based on the plankton samples and temperature observations obtained during this period the egg production and spawning stock size were estimated. The estimated total egg production of mackerel (53 x 10^12 eggs) represents a spawning stock biomass of 78 000 tonnes, which is about twice the estimate in 1988.