Fisheries and Aquatic Sciences

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Fluttering Characteristics of the Ropes and Nets as an Active Stimulating Device inside the Cod End of a Trawl Net

  • Kim, Yong-Hae (Institute of Marine Industry and Department of Marine Production, College of Marine Science, Gyeongsang National University)
  • Received : 2012.07.25
  • Accepted : 2013.04.01
  • Published : 2013.06.30
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Abstract

An active stimulating device (ASD) consisting of a net panel or ropes fluttering in the turbulence inside the cod end was effective in driving fish near the cod end to reduce juvenile by-catch. The fluttering characteristics of the rope and net panel were examined by video observations and analyzed for fluttering amplitude and period in a water channel and in field experiments with a bottom trawl. The amplitude ratio of the fluttering ropes or nets in the tank test increased with the fluttering index as the diameter of the twine, mesh size, flexibility, and flow velocity changed, whereas the period decreased with the above factors. In bottom trawl experiments, the range of mean depth difference in the fluttering net panel was 12-17% of the length of the fluttering net, and the period of depth difference or three-dimensional (3D) tilt was revealed, with shorter ones ranging from 2 to 6 s. The amplitude as depth difference and period from field measurements were similar to those of nets in tank experiments and also to the period of 3D flow velocity inside the cod end. These results could be used to design an ASD that could be used for to the cod end of actual towed fishing gear to reduce juvenile by-catch.

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References

  1. Alben S and Shelley MJ. 2008. Flapping states of an inviscid fluid: bistability and the transition to chaos. Phys Rev Lett 100, 074301, 1-4.
  2. Argentina M and Mahadevan L. 2005. Fluid-flow-induced flutter of a flag. Proc Natl Acad Sci U S A 102, 1829-1834. https://doi.org/10.1073/pnas.0408383102
  3. Gascuel D, Bez N, Forest A, Guillotreau P, Laloe F, Lobry J, Mahevas S, Mesnil B, Rivot E, Rochette S and Trenkel V. 2011. A future for marine fisheries in Europe. Fish Res 109, 1-6. https://doi.org/10.1016/j.fishres.2011.02.002
  4. Kim YH and Ha JS. 1987. Elasticity of the funnel ribs and hydrodynamic characteristics on the sea eel pots. Bull Korean Fish Technol Soc 23, 157-162.
  5. Kim YH. 2010. Performance of an active stimulating device using rope kite or array in the cod end to reduce juvenile by-catch. Fish Aquat Sci 13, 182-189. https://doi.org/10.5657/fas.2010.13.2.182
  6. Kim YH. 2011. Effects on the escapement of juvenile bastard halibut Paralichthys olivaceus of actively stimulating devices inside a model cod end. Fish Aquat Sci 14, 62-69. https://doi.org/10.5657/fas.2011.14.1.062
  7. Kim YH. 2012. Analysis of turbulence and tilt by in-situ measurements inside the codend of a shrimp beam trawl. Ocean Eng 53, 6-15. https://doi.org/10.1016/j.oceaneng.2012.06.014
  8. Kim YH. 2013. Analysis of the turbulent flow and tilt in the codend of a bottom trawl during fishing operations. Ocean Eng 64, 100-108. https://doi.org/10.1016/j.oceaneng.2013.02.019
  9. Kim YH and Wardle CS. 2006. Quantitative analysis of the swimming movements of flatfish reacting to the ground gear of bottom trawls. J Fish Sci Technol 9, 167-174.
  10. Kim YH and Whang DS. 2010. An actively stimulating net panel and rope array inside a model cod-end to increase juvenile red seabream escapement. Fish Res 106, 71-75. https://doi.org/10.1016/j.fishres.2010.07.005
  11. Kim YH, Wardle CS and An YS. 2008. Herding and escaping responses of juvenile roundfish to square mesh window in a trawl cod end. Fish Sci 74, 1-7.
  12. Pichot G, Germain G and Priour D. 2009. On the experimental study of the flow around a fishing net. J Mech B/Fluids 28, 103-116. https://doi.org/10.1016/j.euromechflu.2008.02.002
  13. Shelley M, Vandenberghe N and Zhang J. 2005. Heavy flags undergo spontaneous oscillations in flowing water. Phys Rev Lett 94, art. no. 094302.
  14. Watanabe Y, Suzuki S, Sugihara M and Sueoka Y. 2002. An experimental study of paper flutter. J Fluids Struct 16, 529-542. https://doi.org/10.1006/jfls.2001.0435

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