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The Behaviour of Cod When Approaching and Entering a Pelagic Trawl

The Behaviour of Cod When Approaching and Entering a Pelagic Trawl. Shale Rosen, Terje J örgensen and Arill Engås Insitute of Marine Research Postboks 1870 Nordnes N-5817 Bergen Norway shale.rosen@imr.no. Nor-Fishing Technology Conference 2008 Trondheim, Norway 11-12 August 2008.

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The Behaviour of Cod When Approaching and Entering a Pelagic Trawl

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  1. The Behaviour of Cod When Approaching and Entering a Pelagic Trawl Shale Rosen, Terje Jörgensen and Arill Engås Insitute of Marine Research Postboks 1870 Nordnes N-5817 Bergen Norway shale.rosen@imr.no Nor-Fishing Technology Conference 2008 Trondheim, Norway 11-12 August 2008

  2. Research Question: How do cod react to approach and passage of pelagic trawl? • Applications: • Fishing strategy for efficient capture • Net design for efficient capture • Design and placement of selectivity devices

  3. Same school enters mouth of net 13:37:20 Fish pass under vessel 13:31:52 School in extension of net 13:39:05 Measured velocity through water: 536 m in 328 sec 167 m in 105 sec Tracking Distinct Schools of Cod From Vessel to Extension of Net 1.6 m/sec 1.6 m/sec 1.6 m/sec

  4. Calculations of Swimming Speed Cod in pelagic trawls do not appear to exhibit horizontal swimming behaviour!

  5. The Fishery and Aquaculture Industry Research Fund Acknowledgements

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