Four experiments investigating codend drag |
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| Institution: | 1. NSW Department of Primary Industries, Fisheries Conservation Technology Unit, National Marine Science Centre, Southern Cross University, 2 Bay Drive, Coffs Harbour, NSW 2450, Australia;2. School of the Environment, The University of Queensland, Brisbane, QLD 4072, Australia;3. Department of Statistics, University of Auckland, Private Bag 92019, Auckland, New Zealand;1. College of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, PR China;2. National Engineering Research Center for Oceanic Fisheries, Shanghai, 201306, PR China;3. Key Laboratory of Oceanic Fisheries Exploration, Ministry of Agriculture and Rural Affairs, Shanghai, 201306, China;4. The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Shanghai Ocean University, Ministry of Education, Shanghai, 201306, China;5. Scientific Observing and Experimental Station of Oceanic Fishery Resources, Ministry of Agriculture and Rural Affairs, Shanghai, 201306, China;6. Laboratory E3M, National High Polytechnic School of Douala, University of Douala, Cameroon;7. Faculty of Marine Science, Tokyo University of Marine Science and Technology, Minato, Tokyo, 108-8477, Japan;1. SINTEF Ocean, Brattørkaia 17C, N-7010 Trondheim, Norway;2. The Arctic University of Norway, UiT, Breivika, N-9037 Tromsø, Norway;1. College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;2. National Engineering Research Center for Oceanic Fisheries, Shanghai 201306, China;3. Shanghai Collaborative Innovation Center for Oceanic Fisheries, Shanghai 201306, China;4. Faculty of Marine Science, Tokyo University of Marine Science and Technology, Minato, Tokyo 108-8477, Japan;5. Shimonoseki Research Institute, Nichimo Co., Ltd., Shimonoseki, Yamaguchi 750-1136, Japan;1. Institute of Marine Research, Fish Capture Research Group, P.O. Box 1870, NO-5817, Bergen, Norway;2. The Arctic University of Norway UIT, Hansine Hansens Veg 18, NO-9019, Tromsø, Norway |
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| Abstract: | Four experiments were carried out. - 1.(1) To investigate the drag of various lengths and widths of codend with the ends tied, open and blocked. Short, narrow codends were most affected by these changes in loading.
- 2.(2) To investigate the effect on codend drag of using enveloping small-mesh covers. The drag of the covers was found to be the major factor.
- 3.(3) To compare the drags of codends constructed from square- and diamond-mesh netting. Square-mesh codends had much greater drag.
- 4.(4) To compare the drags of codends constructed from single and double twine. The measured drags were almost identical.
These findings are discussed. and it is argued that the main factors in codend drag are towing speed and netting surface area. |
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