Best practice slipping from purse seines

to increase survival of released fish

Target species:
Herring (Clupea harengus), Mackerel (Scomber scombrus)

Area, Vessel
North Sea and Norwegian Sea.Fiskebas (64 m) and Sjarmør (36 m)
Gear type:
pelagic

Gear modification
The gavel line at the bunt end must be a minimum of 18 m long and also be long enough to ensure that the hanging ratio (E) along the gavel is greater than 80% (“hang in” ratio < 25%) of the stretched mesh size. There must also be a supporting rope from the vessel to the junction between the float line and the gavel. This rope is used to adjust the size of the escape opening.


Results:
The method works well for small and medium sized catches. When large catches are released the size of the escape opening should be further increased to allow for fish to swim out freely.
Further information:
Aud Vold (aud.vold@hi.no) http://www.imr.no/filarkiv/2017/05/hi_nytt_1_2017.pdf/nb-no https://brage.bibsys.no/xmlui/bitstream/handle/11250/2441258/HI-rapp_6-2017.pdf?sequence=1&isAllowed=y




Citation :
, 2017. Best practice slipping from purse seines . In O’Neill, F.G. and Mutch, K. (Eds): Selectivity in Trawl Fishing Gears. Scottish Marine and Freshwater Science Vol 8 No 1.