Hydrodynamic performance of a newly-designed Antarctic krill trawl using numerical simulation and physical modeling methods

Wu, Rong; Jia, Mingxiu; Guan, Qinglong; Huang, Liuyi; Cheng, Hui; Zhao, Fenfang; He, Pingguo; Hu, Fuxiang

doi:10.1016/j.oceaneng.2019.03.022

Cited by 25 publications

(17 citation statements)

References 12 publications

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“…The codend motion and catch build-up in the codend can influence catch quality because they can cause epidermal damage [12,19]. Therefore, it is important to improve the codend performance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cutting Ratio and Catch on Drag Characteristics and Fluttering Motions of Midwater Trawl Codend

Liu

Tang

You

et al. 2021

JMSE

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The codend of a trawl net is the rearmost and crucial part of the net for selective fish catch and juvenile escape. To ensure efficient and sustainable midwater trawl fisheries, it is essential to better understand the drag characteristics and fluttering motions of a midwater trawl codend. These are generally affected by catch, cutting ratio, mesh size, and twine diameter. In this study, six nylon codend models with different cutting ratios (no cutting, 6:1, 5:1, 4:1, 7:2, and 3:1) were designed and tested in a professional flume tank under two conditions (empty codends and codends with catch) and five current speeds to obtain the drag force, spatial geometry, and movement trend. As the cutting ratio of empty codends decreased, the drag force decreased, and the drag coefficient increased. The unfolding degree of codend netting and the height of empty codends were found to be directly proportional to the current speed and inversely proportional to the cutting ratio. The positional amplitude of codend with cutting ratio 4:1 was the smallest for catch. The drag force of codends with catch increased as the current speed increased, and first decreased and then increased as the cutting ratio decreased. To ensure the best stability and minimum drag force of the codend, it is recommended to use the 4:1 cutting ratio codend.

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Section: Introductionmentioning

confidence: 99%

Effect of Cutting Ratio and Catch on Drag Characteristics and Fluttering Motions of Midwater Trawl Codend

Liu

Tang

You

et al. 2021

JMSE

Self Cite

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“…Additionally, krill is a target species in commercial fisheries for aquaculture feeds and for a growing demand for nutraceuticals, which is believed to prevent certain diseases and strengthen the immune system (Juáres et al, 2018(Juáres et al, , 2021Kawaguchi and Nicol, 2020). The Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) has set precautionary catch limits and catch quotas for the sustainable exploitation of Antarctic krill in order to ensure ecosystem equilibrium, the sustainability of krill fisheries, and to balance the competing interests of Antarctic krill (Wan et al, 2019;Bairstow et al, 2021). Furthermore, the Antarctic krill fisheries also face too many issues such as gear selectivity, energy efficiency, catchability, and ecological sustainability (Wan et al, 2019;Thierry et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…The Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) has set precautionary catch limits and catch quotas for the sustainable exploitation of Antarctic krill in order to ensure ecosystem equilibrium, the sustainability of krill fisheries, and to balance the competing interests of Antarctic krill (Wan et al, 2019;Bairstow et al, 2021). Furthermore, the Antarctic krill fisheries also face too many issues such as gear selectivity, energy efficiency, catchability, and ecological sustainability (Wan et al, 2019;Thierry et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…The dynamic behavior of trawl nets has been studied for decades using theoretical, experimental, and numerical simulation methods to reduce fuel consumption through the reduction in the net drag (Hu et al, 1995;Feng et al, 2017;Lee et al, 2018;Wan et al, 2019;Thierry et al, 2020a). Testing physical models in a flume tank is now considered the de facto standard for evaluating new trawl designs and plays an important role in the modern gear development process (Winger et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Feng et al (2017) analyzed the hydrodynamic performance of six designs of existing Antarctic krill trawls from Norway, Japan, and Korea and developed a new four-panel Antarctic krill trawl. Wan et al (2019) designed and analyzed the hydrodynamic performances of a large Antarctic krill trawl (midwater trawl) by numerical simulation and physical model tests and found that the trawl with a large mouth circumference had better hydrodynamic performance and would match with fishing vessels of the class for the efficient production of Antarctic krill. Recently, Thierry et al (2021a) investigated the hydrodynamic performance of a scaled trawl model using numerical simulations based on the fluid-structure interaction (FSI) method in two-way coupling and the flume tank test based on modified Tauti's law.…”

Section: Introductionmentioning

confidence: 99%

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Flume Tank Evaluation on the Effect of Liners on the Physical Performance of the Antarctic Krill Trawl

et al. 2022

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The Antarctic krill (Euphausia superba) is one of the most abundant resources in the ocean, which provides food for several important species in the Antarctic Ocean, and is targeted commercially by humans for many decades. To sustainably manage and harvest the species, energy-efficient, catch-efficient, and selective fishing gears should be developed for the Antarctic krill trawl fishery. This study investigates the effect of twine area and the liner length on the engineering performance of trawl through flume tank testing of trawl model to predict the performance of the full-scale midwater trawl used in the Antarctic krill fishery. Four 1/35th scale trawl model nets with varying lengths of the liner, based on the traditional trawl used in the Antarctic krill fishery, were designed using modified Tauti’s law and were tested in a flume tank at different towing speed, door spread, heavy bob weight, and the ratio of buoyancy to the fishing line (F/G). The results showed that the reduction in liner length by 25 and 50% from the traditional trawl net led to the decrease in twine area by 11.01 and 19.31% and, consequently, resulted in reductions in the lower bridle tension by 12.44 and 19.78%, and increases in energy efficiency by 17.98 and 25.73%, respectively. In addition, the reduction in liner length by 25 and 50% were found to increase the net mouth opening by 2.63 and 5.38% and the swept area by 6.52 and 8.38%, respectively, both of which are proportional to catch rates. Although the trawl net with 50% liner length is more energy-efficient and large mouth opening than those of the trawl net with the liner length over 75% of the trawl body, the large mesh section without a liner can result in the escape of the krill from the trawl, reducing overall catch efficiency. We, therefore, recommend the trawl with 75% of liner length as a suitable design for Antarctic krill considering energy efficiency and catch efficiency.

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Revealing the Fluttering Motions of Mid-Water Trawl Codend Through Sea Trials: Case Study of Antarctic Krill Trawl Codend

Liu

Tang

Thierry

et al. 2023

J. Ocean Univ. China

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Hydrodynamic performance of a newly-designed Antarctic krill trawl using numerical simulation and physical modeling methods

Cited by 25 publications

References 12 publications

Effect of Cutting Ratio and Catch on Drag Characteristics and Fluttering Motions of Midwater Trawl Codend

Effect of Cutting Ratio and Catch on Drag Characteristics and Fluttering Motions of Midwater Trawl Codend

Flume Tank Evaluation on the Effect of Liners on the Physical Performance of the Antarctic Krill Trawl

Revealing the Fluttering Motions of Mid-Water Trawl Codend Through Sea Trials: Case Study of Antarctic Krill Trawl Codend

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