Abstract
Natural spawning of four female and four male turbot in a 40-m 3 tank was monitored over 4 consecutive years. During this time the total quantity of eggs collected each season increased from 0.48 to 6.59 million, of which 34–47% were viable. The bulk of egg production occurred during June. The number of spawnings increased from 5 to 21 over the 4 years and at the same time the average size of the spawnings increased from 37 000 to 126 000 viable eggs. There was a corresponding increase in the number of viable eggs produced/kg of female from 25 000 to 133 000. Egg diameter was negatively correlated with the temperature at the time of spawning ( R = 0.77, P < 0.001).
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