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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Original versionThis report is not to be cited without prior reference to the authors
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.