• Title/Summary/Keyword: Offshore aquaculture

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An Economic Feasibility Study of Mackerel Offshore Aquaculture Production System (고등어 외해가두리양식의 경제성 분석)

  • Kim, Do-Hoon
    • The Journal of Fisheries Business Administration
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    • v.43 no.3
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    • pp.23-30
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    • 2012
  • This study aimed to analyze the economic feasibility of Mackerel offshore aquaculture production performance in Jeju region, Korea. Based on the collected biological, costs and market price data, farming revenue and expenses during the farming period were evaluated, and the net present value and the internal rate of return of a 10-year cash inflow and cash outflow were estimated to determine the economic feasibility of Mackerel offshore aquaculture production system. Model results indicated that the Mackerel offshore aquaculture production performance would have high profitability under the current production and market situation. This is because of the relatively high survival rate, relatively low feed conversion ratio and good market prices. However, sensitivity analyses of main important biological and economic variables showed that the economic viability of Mackerel offshore aquaculture production system would be highly vulnerable to production and market condition changes.

A Study on a Legislation Plan for Introduction of Offshore Aquaculture Fisheries Regime (외해양식어업제도의 도입을 위한 입법방안 연구)

  • CHA, Cheol-Pyo;LEE, Kwang-Nam;KIM, Min-Ju
    • Journal of Fisheries and Marine Sciences Education
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    • v.21 no.3
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    • pp.335-346
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    • 2009
  • Offshore-aquaculture is a new idea, has emerged as an alternative method, which can minimize the damage to the natural disaster due to the environment pollution by the fish farming activities in the coast and overcome the problems of vicious cycle in fish farming management. On the other hand, as the current fish farming laws and institutions focus on the support for offshore-aquaculture, having the limit to revitalizing and supporting the fish farming business in the open sea, it is necessary to amend the laws and institutions related to fish farm. We should be establish in connection with offshore-aquaculture, after the study aims at examining the foreign laws and institutions in such countries as USA and Norway, establishing the methods for the future laws and institutions of open sea fish farm through the analysis of the issues and controversies in the process of enactment in Korea.

A Study on the Investment Decision of Offshore Aquaculture under Risk (위험 하에서의 외해가두리양식업 투자의사결정에 관한 연구)

  • Kim, Do-Hoon;Choi, Jong-Yeol;Lee, Jung-Uie
    • The Journal of Fisheries Business Administration
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    • v.39 no.2
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    • pp.109-123
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    • 2008
  • This study is aimed to establish an investment decision model for offshore aquaculture project of rock bream in Korea using a certainty equivalent method (CEM) based on the expected utility theory and to investigate its economic viability under risk and uncertainty. In the analysis with CEM, the effects of risk attitude and risk level on investment and risk premium were examined and the impacts of various risk and uncertainty factors on the investment decision were also assessed. In addition, the outcomes were compared to those evaluated by the traditional net present value (NPV) method. Results show that risk premium grew as the investors became more risk averse and uncertainty level (the variance of NPV) increased. Consequently, the certainty equivalent value was predicted to decrease from the value assessed by the traditional NPV method.

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A Study on the Building of Tuna Farming in Floating Offshore Wind Power Generation Field at East Sea (동해 부유식 해상풍력발전단지 내 참다랑어 양식장 조성에 관한 연구)

  • Choi, Gun Hwan;Kim, Mi Jeong;Jang, Ki Ho;Kim, Hyo Seon
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.33 no.5
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    • pp.179-186
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    • 2021
  • We need measures that can come up with alternative about fishery living zone and enhance local acceptance for responding to the increase in the proportion of renewable energy production and construction of 12GW Offshore wind power according to Korea's Renewable Energy 3020 initiative and Korean-version New Deal. In this study, We suggest that differentiation plans of co-location model in connection with offshore wind power generation suitable for the East Sea. The East Sea is an optimal site for building of a floating offshore wind power generation(FOWPG) field. It is expected that economic effects like energy production, aquatic resource development and tourism industrialization by farming bluefin tuna which is high valued fish and suitable for offshore aquaculture on public waters in FOWPG field. And we can confirm that budget reduction, smart management by sharing operation management technology and increase in fishermen income.

The Numerical Modeling and Sliding Mode Control of A New Submersible Fish Cage

  • Lee, Hyunsu;Won, Sung Jae;Ahn, Kyoung Kwan
    • Journal of Drive and Control
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    • v.14 no.3
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    • pp.18-24
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    • 2017
  • The purpose of this paper is to develop a new submersible fish cage operated by a pneumatic system for offshore aquaculture. Although some researchers have investigated modeling and control of fish cages, such cages consist of variable ballast tanks that with closed cylinders and thus present a maintenance issue. In solving the issue the new submersible fish cage investigated consists of bottom-opening cylinders. Accordingly, we designed a mathematical model of the concept and applied Sliding Mode Control for nonlinear angle control. Some experiments conducted under assumed conditions indicate that the angle of the system converges to zero under all conditions and the control has the stability to balance the fish cage.

Effect of an Offshore Fish Culture System on the Benthic Polychaete Community (외해가두리 양식이 저서다모류군집에 미치는 영향)

  • Jung, Rae-Hong;Yoon, Sang-Pil;Kim, Youn-Jung;Lee, Won-Chan;Hong, Sok Jin;Park, Sung-Eun;Oh, Hyung Taik
    • The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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    • v.18 no.4
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    • pp.195-205
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    • 2013
  • Excessive input of organic matters from fish cage farming has been considered as one of the major factors disturbing benthic ecosystem, especially in semi-enclosed coastal waters. Recently offshore aquaculture in the vicinity of Jeju-do has been introduced to minimize that kind of negative impact. This study was conducted to investigate the ecological impacts of offshore aquaculture on the macrobenthic polychaete communities. A total of ten sampling works were carried out for 28 months, spanning from 10 days after starting giving feed to 3 months after stopping giving feed. During the study period, mean current velocity was quite strong with the range of 50 cm/s to 70 cm/s. TOC of surface sediment was constantly low. Significant changes in polychaete community were detected just three months after starting giving feed, which were the increase of the number of species and density at all stations. Up to 18 months after the start of farming, the amount of feed provided played an important role in the fluctuation of the number of species and density, especially at 0 m and 10 m stations. After reducing the amount of feed provided, dominance of some opportunistic species within 10 m distance from fish cages still lasted to the end of aquaculture. However, opportunistic species disappeared 3 months after the end of farming, which indicated the sign of recovery from the disturbance. From these results, the amount of food input and the period of cultivation were critical factors disturbing polychaete community and ensuing changes in this offshore and oligotrophic waters as well. In addition, study on the changes of polychaete community structure before and after fish farming showed more detailed changes in benthic ecological state than geochemical approach did.