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In the period September 2011 to January 2012 three herring larvae surveys were carried out by ‘RV Tridens’. In September, the Buchan area and Central North Sea were sampled and in December and January the southern North Sea and the Eastern channel. The weather conditions during the September and December surveys were mostly good and all planned stations could be sampled. In January due to bad weather conditions and engine problems some stations could not be sampled. During all surveys good coverage of the entire sampling area was achieved.