Estimated hatching date and growth history of Norwegian spring spawning herring (Clupea harengus L.) from otolith data of larvae of the 1990 yearclass
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This study was performed on herring larvae of the 1990 yearclass of Norwegian spring spawners. The larvae were caught in May on the Norwegian shelf in the area from 64 °N - 69 °N. There was one size group of larvae with standard length 20-30 mm and another with standard length 30-40 mm. The distribution of data for hatching date and growth history were back-calculated from otolith data. These data were compared with the hatching that actually took place over the spawning grounds in March/ April the same year. Differences in growth rate and distribution of birth date between the larvae within the investigated area were studied.