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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on July 11, 2007
ICES Journal of Marine Science: Journal du Conseil 2007 64(8):1517-1524; doi:10.1093/icesjms/fsm097
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© 2007 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Evaluating the impact of gillnet ghost fishing using a computational analysis of the geometry of fishing gear

Tsutomu Takagi1,, Takashi Shimizu2 and Holger Korte3

1 School of Agriculture, Kinki University, 3327-204 Nakamachi, Nara 631-8505, Japan
2 Graduate School of Fisheries Science, Hokkaido University, Minatocho, Hakodate 041-8611, Japan
3 University of Rostock, 18119 Warnemunde, Germany

Correspondence to T. Takagi: tel: +81 742 43 6169; fax: +81 742 43 6169; e-mail: tutakagi{at}nara.kindai.ac.jp

Takagi, T., Shimizu, T., and Korte, H. 2007. Evaluating the impact of gillnet ghost fishing using a computational analysis of the geometry of fishing gear. – ICES Journal of Marine Science, 64: 1517–1524.

We developed a net shape and load analysis system (NaLA) that can estimate the three-dimensional shape of fishing gear underwater computationally. This paper introduces the latest version of the numerical model of the NaLA. Previously, NaLA was used to estimate the net geometries and internal forces of some fishing gear, demonstrating its general versatility. However, the ultimate goal of our study has been to learn about the impact of fishing and the capture process from a physical perspective, not simply to develop elemental technologies for gear design. Accurate, quantitative evaluation of fishing gear performance from a physical perspective can be used to estimate the potentialities of the ghost fishing to gillnet gears. Although the applications are not limited to geometries and internal forces, the paper describes how computer-aided simulations of fishing gear should be applied to investigations of the impact of ghost fishing caused by lost drift and bottom gillnets. The computational results showed that a driftnet with homogenous net panels was deformed slightly and bent only at the two ends of the net. Accumulation of periphyton on a bottom gillnet after 25 d of immersion caused it to settle to the sea bottom.

Keywords: fishing impact, gear performance, ghost fishing, net geometry, numerical simulation

Received 31 August 2006; accepted 26 May 2007; advance access publication 11 July 2007.


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