International Council for the Exploration of the Sea
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Report of the Planning Group for Herring Surveys

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posted on 1998-01-01, 00:00 authored by ICESICES
a) coordinate the timing, area allocation and methodologies for acoustic and larval surveys for herring in the North Sea,Division VIa and lIla and the Western Baltic;b) combine the survey data to provide estimates of abundance for the population within the area;c) hold a Workshop on acoustic echogram examination procedures;d) assess the results of studies on the separation of west coast and North Sea herring stocks within the acoustic surveytime series; the examination of the pre-1991 surveys for possible under-estimation duc to signal saturation in theelectronies; the inter ship-calibration and the study of variability of trawl performance between participants;e) review the results of the above studies and then report on the applicability of further study on the herring survey timeseries.


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