Doppio strascico pelagico
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La tecnica del doppio strascico pelagico è quasi identica allo strascico semplice, con la differenza che nel traino in coppia non è necessario l’uso di divergenti pelagici. L’apertura della rete è determinata dalla distanza tra le imbarcazioni e la profondità viene modificata a seconda della lunghezza dei cavi e/o della velocità di traino.
Un’imbarcazione cala la rete e l’altra si occupa di raccogliere le briglie. Una volta fissate entrambe le sciabiche, viene proporzionata la lunghezza di cavo adeguata e le imbarcazioni avanzano verso i banchi bersaglio.
Come per lo strascico di fondo, l’assenza di divergenti permette a due imbarcazioni di potenza modesta di trainare reti relativamente grandi.
- Click to view environmental impacts of Pelagic single & pair trawl
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Potential Impacts (Biological/Environmental) Gear Selectivity Regulation Biological
• Capture of non target fish species (minimal as single species fishery)
• Incidental bycatch of cetaceans
• Capture/discarding of undersized target species
Environmental
• Minimal - no interaction with seabed
• Mesh size
• Wing/net body design
• Height in water column
• Net size
• Minimum mesh size
• Minimum fish sizes
• % of catch mix retained on board
Improvement measures and initiatives taken by Scottish Fishermen
• Through 2005/6 Areas IV & VI had 400 pelagic trawl fishing operations monitored by the SMRU to record cetacean bycatch. None was observed on any of these trips.
• Scottish Industry/Science partnership is currently working to investigate technical measures which can be employed in Scottish pelagic trawls to reduce the capture of juvenile mackerel.
• Moves by industry to convert mackerel trawls to Dynema fibre (an extremely lightweight, strong, non-stretch, polyethylene) has reduced twine diameter, overall gear weight, and sweep and warp replacement. This has resulted in significant reductions to drag and savings on fuel consumption, thus reducing carbon footprint.
• Mackerel trawls are now incorporating hexagonal mesh sections of net in the wings and around the net mouth, which are reducing net drag and fuel usage.
