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

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

5. Acknowledgements The Fishery and Aquaculture Industry Research Fund