Seasonal variations in selectivity of plaice trammel nets

The size selectivity of plaice trammel nets was measured in an experiment using catch at length data from six different mesh sizes. Three trials at different times of the year were conducted on a traditional Danish gill-netter giving a total catch of 17,163 plaice—one of the largest European gill/tr...

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Bibliographic Details
Published in:Fisheries research 2003-03, Vol.61 (1), p.87-94
Main Author: Moth-Poulsen, Thomas
Format: Article
Language:English
Subjects:
Gill net
Marine
North Sea
Plaice
Pleuronectes platessa
SELECT
Selectivity
Trammel net
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Summary:The size selectivity of plaice trammel nets was measured in an experiment using catch at length data from six different mesh sizes. Three trials at different times of the year were conducted on a traditional Danish gill-netter giving a total catch of 17,163 plaice—one of the largest European gill/trammel net datasets. Maximum likelihood procedure was used to estimate different types of selectivity curves for each set (soak). A bimodal curve was found to fit the data best. The between set variation was taken into account when calculating a mean selectivity curve for each of the three trials. The modal fish length for largest retention was 2.52 times mesh size. Significant seasonal differences in selectivity were found. The optimum mesh sizes were compared to commercial practice and the trammel net selectivity curve was compared to previous results on gill-nets with a low hanging ratio, i.e. tangle nets.
ISSN:0165-7836
1872-6763
DOI:10.1016/S0165-7836(02)00186-8