Selectivity experiments with square mesh codends in bottom trawl
Working paper
Permanent lenke
http://hdl.handle.net/11250/104115Utgivelsesdato
1986Metadata
Vis full innførselSamlinger
Originalversjon
This report is not to be cited without prior reference to the authorsSammendrag
During selectivity experiments with square and diamond mesh codends, an
evaluation of the covered codend method and a modified trouser trawl
method went in favour of the last one. Both twisted knotless- and
braided knotted material was used for the experiments. Square mesh
codends gave higher 50% retention lengths and selection factor than the
diamond mesh codend, both for cod and haddock. Fished commercially, the
square mesh codend of knotted netting caught fewer undersized fish than
the diamond mesh codend. Big bycatches of redfish caused heavy meshing
in the square mesh codend and reduced the selectivity. Due to the fixed
circumference of the square mesh codend some problems arose when
emptying big hauls on a sterntrawler.