Inclined water flow and its applications for reduced bycatch in shrimp trawls

• Main Authors: Engås, Arill, Gamst, Kjell Arne, Graham, Norman
• Format: Conference Object
• Language: English
• Published: PINRO Press 2001
• Subjects: VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924; Murmansk; Nordmøre; Norway; Northern Norway
• Online Access: http://hdl.handle.net/11250/107581

Technical regulations and by-catch criteria in the Baretns Sea fisheries. Proceedings of the 9th PINRO-IMR Symposium. Murmansk, 14-15 August 2001. The use of the Nordmøre grid in the Pandalus fishery has significantly reduced the bycatch of finfish. Grids operate on physical separation based on size to achieve bycatch reduction. However, problems arise when the size range of fish overlaps the shrimp. In this paper results from an initial trial in northern Norway with a new selection device creating a vortex circulating out of the escape opening to force/stimulate fish are presented. The water flow (vortex) seemed to be fairly low and varied during the six observations hauls. Observations of fish behaviour showed that 0-group cod and haddock reacted to the water flow created by the deviced. The escape rate of fish varied between the six hauls possibly due to the variation in flow pattern.