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Junbo Zhang
College of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, China

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Journal article
Published: 24 May 2021 in Ocean Engineering
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The use of an automated net-hauling system using four polyethylene (PE) pipes is proposed in this study to increase the efficiency of set net fishery. In this system, the pipes are installed on the seabed beneath a box chamber net. Compressed air is injected into the first pipe at the slope net and then into the other pipes in succession. In this system, the fish are cornered between the fourth pipe and the end of the box chamber net. The performance of the system from the second to the fourth pipe is evaluated using numerical analysis, water tank tests, and field experiments. In addition, a static numerical model for the deformation of the PE pipes is developed using the theory of finite deformation and is validated by the results of the water tank and coastal sea experiments. The results show that the maximal bending stress of the full-scale pipe is about 10 MPa, which is within the allowable range of 23 MPa, indicating that the risk of pipe breakage in the automated net-hauling system is considerably low. Therefore, the automated net-hauling system developed in this study has high application value and development potential in set net fishery.

ACS Style

Junbo Zhang; Marin Dohi; Takero Yoshida; Daisuke Kitazawa. Investigating the utilization of polyethylene pipe for automated hauling system in set net fishery. Ocean Engineering 2021, 233, 109192 .

AMA Style

Junbo Zhang, Marin Dohi, Takero Yoshida, Daisuke Kitazawa. Investigating the utilization of polyethylene pipe for automated hauling system in set net fishery. Ocean Engineering. 2021; 233 ():109192.

Chicago/Turabian Style

Junbo Zhang; Marin Dohi; Takero Yoshida; Daisuke Kitazawa. 2021. "Investigating the utilization of polyethylene pipe for automated hauling system in set net fishery." Ocean Engineering 233, no. : 109192.

Review
Published: 18 December 2020 in Journal of Marine Science and Engineering
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The dynamic predator–prey relations in the food web are vital for understanding the function and structure of ecosystems. Dietary estimation is a research hotspot of quantitative ecology, providing key insights into predator–prey relationships. One of the most promising approaches is quantitative fatty acid signature analysis (QFASA), which is the first generation of statistical tools to estimate the quantitative trophic predator–prey relationships by comparing the fatty acid (FA) signatures among predators and their prey. QFASA has been continuously widely applied, refined and extended since its introduction. This article reviewed the research progress of QFASA from development and application. QFASA reflects the long-term diet of predator, and provides the quantitative dietary composition of predator, but it is sensitive to the metabolism of predator. The calibration coefficients (CCs) and the FA subset are two crucial parameters to explain the metabolism of predators, but the incorrect construction or improper use of CCs and the FA subset may cause bias in dietary estimation. Further study and refinement of the QFASA approach is needed to identify recommendations for which CCs and subsets of FA work best for different taxa and systems.

ACS Style

Junbo Zhang; Chonglan Ren; Hu Zhang; Fang Yin; Shuo Zhang; Rong Wan; Daisuke Kitazawa. Review of Estimating Trophic Relationships by Quantitative Fatty Acid Signature Analysis. Journal of Marine Science and Engineering 2020, 8, 1030 .

AMA Style

Junbo Zhang, Chonglan Ren, Hu Zhang, Fang Yin, Shuo Zhang, Rong Wan, Daisuke Kitazawa. Review of Estimating Trophic Relationships by Quantitative Fatty Acid Signature Analysis. Journal of Marine Science and Engineering. 2020; 8 (12):1030.

Chicago/Turabian Style

Junbo Zhang; Chonglan Ren; Hu Zhang; Fang Yin; Shuo Zhang; Rong Wan; Daisuke Kitazawa. 2020. "Review of Estimating Trophic Relationships by Quantitative Fatty Acid Signature Analysis." Journal of Marine Science and Engineering 8, no. 12: 1030.

Journal article
Published: 31 August 2020 in Aquacultural Engineering
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Recent variations in marine environments have increased the risk of aquaculture accidents at sea. This risk can be reduced by installing fish cages at the desired depth, based on environmental conditions such as wave height, the vertical profiles of water temperature, algal concentration, and dissolved oxygen concentration. Most submergible fish cages can be located at only two depths: the sea surface and a submerged depth. In the present study, a fish cage installed at various depths, i.e., a controllable depth cage (CDC), is proposed for avoiding undesirable environments. A water tank experiment is conducted to measure the drag of the cage and the static deformation of the mooring system using a scale model of the actual cage. Then, a simple numerical model based on the balance of forces on each component is developed to analyze the position and the attitude of the cage and the mooring tension of the system. The numerical model is verified by comparing the experimental and numerical results. The outcome showed that the cage and floats moved downstream at an increasing velocity. The results of the numerical simulation supported those of the water tank experiment. However, the simulated vertical positions of a cage and floats were higher compared with experimental results. Additionally, the inclination of angle increased alongside increasing velocity in the numerical simulation, whereas a complex variation was observed in the experiment. This happened because of underestimating the drag on the mooring rope in lower water current velocities; additionally, cage lift was not considered in the numerical model. Despite these discrepancies, the tension of each mooring rope was well predicted because of the dominant tension of the horizontal component. In future studies, the balance of forces on the rope should be predicted more precisely, and variations in cage drag and inclination angle should be included in the numerical model. Additionally, the effect of waves should be considered alongside water currents to ensure the safety of the CDC.

ACS Style

Junbo Zhang; Hiroki Shimizu; Hirotaka Nakashima; Yoichi Mizukami; Takero Yoshida; Lili Liu; Daisuke Kitazawa. Water-tank experiment and static numerical analysis of the mooring system of a controllable depth cage. Aquacultural Engineering 2020, 91, 102118 .

AMA Style

Junbo Zhang, Hiroki Shimizu, Hirotaka Nakashima, Yoichi Mizukami, Takero Yoshida, Lili Liu, Daisuke Kitazawa. Water-tank experiment and static numerical analysis of the mooring system of a controllable depth cage. Aquacultural Engineering. 2020; 91 ():102118.

Chicago/Turabian Style

Junbo Zhang; Hiroki Shimizu; Hirotaka Nakashima; Yoichi Mizukami; Takero Yoshida; Lili Liu; Daisuke Kitazawa. 2020. "Water-tank experiment and static numerical analysis of the mooring system of a controllable depth cage." Aquacultural Engineering 91, no. : 102118.

Journal article
Published: 25 August 2020 in Journal of Marine Science and Engineering
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In the process of pond culture, the usage of an aeration device can increase dissolved oxygen density and form a decent circulation which facilitates the collection of sludge. Acoustic Doppler Velocimeter (ADV) has been widely used to monitor the flow velocity, however, factors such as bubbles and suspended particles can affect the correlation coefficient and signal-to-noise ratio of ADV, which leads to the existence of outliers in velocity data. This study constructs the three-dimensional rousseeuw phase-space (3DRPS) method by optimizing the phase space threshold method and robust estimation method through two-step filtering and three-dimensional simultaneous measurement, where the outliers close to the real value can be detected more accurately and the iterative process can be reduced more effectively. The results show that the detection rate of the optimized 3DRPS method is approximately 99%. It is a promising method that effectively improves the accuracy of outlier detection and greatly reduces the phenomenon of over processing.

ACS Style

Chunyi Zhong; Fang Yin; Junbo Zhang; Shuo Zhang; Rong Wan; Daisuke Kitazawa. Optimized Algorithm for Processing Outlier of Water Current Data Measured by Acoustic Doppler Velocimeter. Journal of Marine Science and Engineering 2020, 8, 655 .

AMA Style

Chunyi Zhong, Fang Yin, Junbo Zhang, Shuo Zhang, Rong Wan, Daisuke Kitazawa. Optimized Algorithm for Processing Outlier of Water Current Data Measured by Acoustic Doppler Velocimeter. Journal of Marine Science and Engineering. 2020; 8 (9):655.

Chicago/Turabian Style

Chunyi Zhong; Fang Yin; Junbo Zhang; Shuo Zhang; Rong Wan; Daisuke Kitazawa. 2020. "Optimized Algorithm for Processing Outlier of Water Current Data Measured by Acoustic Doppler Velocimeter." Journal of Marine Science and Engineering 8, no. 9: 655.

Original article
Published: 11 November 2017 in Journal of Marine Science and Technology
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In a set-net fishery, a leader net and the related nets guide migratory fish into a box chamber net. Many workers have to visit the set-net and haul the box chamber net for harvesting almost every day, while the net-hauling operation in the early morning is dangerous. An automated net-hauling system using a flexible hose net has been proposed as a manpower-saving measure in such operation. The hose net comprises the brick forms of flexible hoses and is installed on the water bottom below the box chamber net. Compressed air is injected from one edge of the hose net to haul the box chamber net gradually, resulting in cornering fish in the other edge. The purpose of the present study is to observe the motion of the hose net and to analyze its formation in water current. Water tank testing was carried out using a 1/100 scale model of a set-net and a hose net. As a result, the middle part of the hose net was steep enough to corner fish in the end of the box chamber net. The two-dimensional formation of the hose net could be approximated by a catenary curve, while a part of the hose net including air inside was likely to have stiffness. The stiffness of the hose including air inside should be taken into account in the following water tank testing. The experimental results will provide the benchmark for the validation of the numerical model, which will be developed in the future. In addition, numerical analysis as well as water tank testing will reveal the tension on the hose net and mooring ropes for the basic design of the hose net in the future. For realizing the prototype of the hose net, special care should be taken for the explosion of air with decreasing pressure in the floating operation and for the leakage of air through the pinholes, which may be generated by sudden change in water pressure on the flexible hoses and their connectors.

ACS Style

Daisuke Kitazawa; Junbo Zhang; Yoichi Mizukami; Yoshio Hirai; Takashi Hosokawa. Experimental study on the motion of a flexible hose net used for fish-harvesting in a set-net fishery. Journal of Marine Science and Technology 2017, 23, 620 -632.

AMA Style

Daisuke Kitazawa, Junbo Zhang, Yoichi Mizukami, Yoshio Hirai, Takashi Hosokawa. Experimental study on the motion of a flexible hose net used for fish-harvesting in a set-net fishery. Journal of Marine Science and Technology. 2017; 23 (3):620-632.

Chicago/Turabian Style

Daisuke Kitazawa; Junbo Zhang; Yoichi Mizukami; Yoshio Hirai; Takashi Hosokawa. 2017. "Experimental study on the motion of a flexible hose net used for fish-harvesting in a set-net fishery." Journal of Marine Science and Technology 23, no. 3: 620-632.

Journal article
Published: 27 July 2016 in Mitigation and Adaptation Strategies for Global Change
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ACS Style

Chenxing Yang; Xiaobo Lou; Takahiro Matsui; Junbo Zhang. Evaluating the technical efficiencies of fishing vessels to achieve effective management of overexploited fisheries. Mitigation and Adaptation Strategies for Global Change 2016, 22, 1149 -1162.

AMA Style

Chenxing Yang, Xiaobo Lou, Takahiro Matsui, Junbo Zhang. Evaluating the technical efficiencies of fishing vessels to achieve effective management of overexploited fisheries. Mitigation and Adaptation Strategies for Global Change. 2016; 22 (8):1149-1162.

Chicago/Turabian Style

Chenxing Yang; Xiaobo Lou; Takahiro Matsui; Junbo Zhang. 2016. "Evaluating the technical efficiencies of fishing vessels to achieve effective management of overexploited fisheries." Mitigation and Adaptation Strategies for Global Change 22, no. 8: 1149-1162.

Original article
Published: 21 July 2016 in Journal of Marine Science and Technology
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Energy from tidal streams is a reliable renewable energy source worth exploiting. With increasing concern over the potential effects of ocean energy utilization on marine environment and organisms, several previous experimental studies have been conducted focusing on fish behavior and their collision risk with hydrokinetic turbines for power generation. This study is aimed at exploring the behavior of marine animals around marine current turbines (MCTs) in the sea environment by conducting a laboratory experiment based on similarity laws for the turbine tip speed and maximum marine animal swimming speed. Three rotation frequencies (0, 5 and 20 rpm) with two releasing areas (upstream and downstream areas) were considered in our experiment. Results showed that fish survival rate was 100 % after 48 h, and only one fish came into contact with the turbine hub and was inactive in front of it when the MCT was in a stationary state during our preliminary test of swimming endurance. Although both the initial releasing area of fish and the rotation speed of MCT have significant effects on fish passage count rate (PCR) via a turbine, there is no interaction between these two factors. PCR was generally higher when fish were put into the tank in the downstream area, irrespective of the turbine rotation. And the returning behavior in the downstream area was more frequently found compared with that in the upstream area, which indicates that the location of MCTs should be considered at the downstream of a channel in practice to reduce the potential risk of fish injury. The ratio of fish passing from the outer side (±3) of the turbine was larger, and a clear U-shaped distribution could be observed. The entering behavior almost disappeared (less than 1.3 %) when MCT rotated with a frequency of 20 rpm. It indicates the design of the rotation frequency of MCT should be more than 20 rpm. However, higher tip speeds and darkness conditions are not considered in our experiment. Based on the laws of similarity proposed in this study, it becomes possible to compare the experimental results with real sea results, to allow explanation and discussion of fish behavior around MCTs, through the parameters of flow velocity, turbine tip speed, and maximum fish swimming speed.

ACS Style

Junbo Zhang; Daisuke Kitazawa; Sayuri Taya; Yoichi Mizukami. Impact assessment of marine current turbines on fish behavior using an experimental approach based on the similarity law. Journal of Marine Science and Technology 2016, 22, 219 -230.

AMA Style

Junbo Zhang, Daisuke Kitazawa, Sayuri Taya, Yoichi Mizukami. Impact assessment of marine current turbines on fish behavior using an experimental approach based on the similarity law. Journal of Marine Science and Technology. 2016; 22 (2):219-230.

Chicago/Turabian Style

Junbo Zhang; Daisuke Kitazawa; Sayuri Taya; Yoichi Mizukami. 2016. "Impact assessment of marine current turbines on fish behavior using an experimental approach based on the similarity law." Journal of Marine Science and Technology 22, no. 2: 219-230.

Journal article
Published: 25 April 2015 in Mitigation and Adaptation Strategies for Global Change
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As a bio-mitigation strategy of aquafarming pollutants, the integrated multitrophic aquaculture (IMTA) system has been proposed and developed to mitigate the waste produced during co-cultivation. Although there have been considerable implementations of IMTA worldwide, its optimal design needs a further study. Through a numerical modeling approach, this study aims to facilitate decision-making when designing IMTA to more efficiently mitigate the negative change caused by aquaculture. An improved three-dimensional numerical model is adopted to simulate the dynamics of water current and organic waste in Gokasho Bay, Japan. Results show that (1) the maximum main surface water current velocity in Hazama-ura area is less than 10 cm s−1, where nutrient absorbers and/or suspended feeders can easily attach to a substratum; (2) southern-eastern direction water flow is dominant through the year suggesting that seaweeds (e.g., Laminaria japonica, Ulva ohnoi) or mussels (e.g., Mytilus edulis) are better arranged in the same direction; (3) horizontal distribution of organic waste on sea bottom indicates that when releasing sea cucumbers (e.g., Apostichopus japonicus), priority is given to the areas where the accumulated amount of particulate organic waste is high. Our case study provides a general idea on the optimal design of IMTA and can be scaled to the globe, especially regarding decision-making on locations for the extractive organisms. In conclusion, to improve the bio-mitigation efficiency of IMTA, location for nutrient absorbers and/or suspended feeders can be selected based on local water flow, and sea cucumbers need to be placed with a careful consideration of the waste distribution in local area.

ACS Style

Junbo Zhang; Daisuke Kitazawa; Chenxing Yang. A numerical modeling approach to support decision-making on design of integrated multitrophic aquaculture for efficiently mitigating aquatic waste. Mitigation and Adaptation Strategies for Global Change 2015, 21, 1247 -1261.

AMA Style

Junbo Zhang, Daisuke Kitazawa, Chenxing Yang. A numerical modeling approach to support decision-making on design of integrated multitrophic aquaculture for efficiently mitigating aquatic waste. Mitigation and Adaptation Strategies for Global Change. 2015; 21 (8):1247-1261.

Chicago/Turabian Style

Junbo Zhang; Daisuke Kitazawa; Chenxing Yang. 2015. "A numerical modeling approach to support decision-making on design of integrated multitrophic aquaculture for efficiently mitigating aquatic waste." Mitigation and Adaptation Strategies for Global Change 21, no. 8: 1247-1261.

Journal article
Published: 01 April 2015 in Marine Pollution Bulletin
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Particulate organic waste, originating from fish cultured in cages, often brings about negative effects on the structure of bottom sediments. These effects result in deterioration of the aquatic environment. In the present study, a three-dimensional numerical model was coupled with developed submodels of fish cage drag and aquaculture waste diffusion to simulate the hydrodynamic environment and distribution of particulate organic waste. Numerical simulation results showed that fish cages exerted an influence on both the velocity and direction of water current; the reduction of water current velocity was a maximum of approximately 38%. The contribution of fish fecal matter was dominant during winter (ca. 80%), whereas waste fish feed was the main source in other seasons. The distribution of organic waste near the sea bottom indicated that organic waste not only loaded mainly on the sea floor just beneath the fish cages but also diffused towards the coastlines.

ACS Style

Junbo Zhang; Daisuke Kitazawa. Numerical analysis of particulate organic waste diffusion in an aquaculture area of Gokasho Bay, Japan. Marine Pollution Bulletin 2015, 93, 130 -143.

AMA Style

Junbo Zhang, Daisuke Kitazawa. Numerical analysis of particulate organic waste diffusion in an aquaculture area of Gokasho Bay, Japan. Marine Pollution Bulletin. 2015; 93 (1-2):130-143.

Chicago/Turabian Style

Junbo Zhang; Daisuke Kitazawa. 2015. "Numerical analysis of particulate organic waste diffusion in an aquaculture area of Gokasho Bay, Japan." Marine Pollution Bulletin 93, no. 1-2: 130-143.

Journal article
Published: 20 August 2011 in Journal of Fishery Sciences of China
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ACS Style

Junbo Zhang; Zhenlin Liang; Liuyi Huang; Yanli Tang; Chenxing Yang; Qinfeng Gao. Attractive effects of artificial reef models of different shapes, materials and spatial arrangements on Japanese sea-cucumber Apostichopus japonicas. Journal of Fishery Sciences of China 2011, 18, 899 -907.

AMA Style

Junbo Zhang, Zhenlin Liang, Liuyi Huang, Yanli Tang, Chenxing Yang, Qinfeng Gao. Attractive effects of artificial reef models of different shapes, materials and spatial arrangements on Japanese sea-cucumber Apostichopus japonicas. Journal of Fishery Sciences of China. 2011; 18 (4):899-907.

Chicago/Turabian Style

Junbo Zhang; Zhenlin Liang; Liuyi Huang; Yanli Tang; Chenxing Yang; Qinfeng Gao. 2011. "Attractive effects of artificial reef models of different shapes, materials and spatial arrangements on Japanese sea-cucumber Apostichopus japonicas." Journal of Fishery Sciences of China 18, no. 4: 899-907.