Sea Technology

AUG 2017

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Page 26 of 76

26 st / August 2017 Acknowledgments This research was conducted as part of the project en- titled "Development of eco-friendly copper-alloy netting for anti-fouling and fish farming cages" funded by the Ministry of Ocean and Fisheries, South Korea. References For a list of references, contact Bokyu Hwang at bkh ST respectively. Thus, the anti-foulant fiber net grew the small- est amount of sessile organisms. However, the copper-alloy fish net, which has a self-antimicrobial effect, was found to have grown a similar amount of sessile organisms to the anti-foulant fiber net. Therefore, it is expected to provide a more environmentally friendly setting for the fish. Conclusion This study demonstrated that a copper-alloy net cage exhibits less internal volume deformation with current changes relative to a conventional fiber-net cage. Thus, the copper-alloy net cage was found to provide a more suit- able space for fish that would encourage growth and help prevent diseases, relative to conventional synthetic fiber net cages. Furthermore, although depth sensors and ultrasonic pingers have been used to measure the underwater shape of existing cage nets, these techniques are accompanied by various assumptions because they estimate the global shape or the spatial deformation by using the positional coordi- nates of a specific part to which the sensor is attached. In contrast, the use of a sonar system, as proposed in this study, can intuitively and clearly verify the overall shape of the underwater fish net and can closely observe the change in the cage shape due to external forces such as currents. In addition, the behavior of the fish can be observed through the net, enabling more diverse analyses. Our research team has successfully conducted offshore experiments to measure the underwater behavior of round cages using a copper-alloy net, and the results of these ex- periments are expected to contribute to the development of the offshore cage industry. Dr. Jihoon Lee is an associate professor at the Division of Marine Technology of Chonnam National Univer- sity, Yeosu, South Korea. He received a Ph.D. in marine technology from the Norwegian University of Science and Technology. His research interests are in the de- sign and development of fishery systems and facilities. Dr. Bokyu Hwang is an associate professor at the Department of Marine Science and Production of Kunsan National University, Kunsan, South Korea. He received a Ph.D. in fisheries acoustics from Tokyo University of Marine Science and Technology. His re- search interests are in fisheries acoustics. Dr. Mooyoul Choe is a researcher at Ocean Sys-Tech Co. Ltd. He received his Ph.D. in fishing gear systems from Pukyong National University. His research inter- ests are in the design and development of aquacul- ture facilities.

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