• 수산경영론집
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• 제45권1호
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• pp.95-107
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• 2014

This study is aimed to analyze the economic performance of black rockfish aquaculture by standardizing cost structures by region and farming size. The result of survey on farming and sale condition in each region, stocking density, survival rate, juvenile price, and unit production was the highest at Yeosu and Tongyeong, Heuksando showed the lowest. While rearing period was the longest at Tongyeong, the shortest region was Yeosu and Wando. In farming cost structure by region, amount of feeing was the highest at Tongyeong and Yeosu, and the lowest was Heuksando. Cost of medicine was high in Wando and Taean region, Yeosu and Hecksando was low. In case of farm size, feed cost ratio was high in the order of medium(0.75ha), small(0.25ha) and large(1.25ha) size. Standard production cost at every farm size of Heuksando showed the lowest among these regions. Taean and Yeosu was middle, and Tongyeong and Wando was the highest. According to the income, profit rate and investment return of farm size in all regions, as the bigger farm size, the higher income and profit rate was revealed. However, in case of Wando, Taean, and Heuksando which regions has high investment return, medium farm size was higher than large size. The result of economic analysis according to various factors, economic feasibility of black rockfish aquaculture in marine floating cage was showed significant changes by rearing and market condition.

• 한국수산과학회지
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• 제21권1호
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• pp.30-34
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• 1988

본 연구는 1987년 9월 8일, 9일 양일간에 걸쳐 24시간 동안 곤리도 금성수산 방어 가두리 양식장에서 해산어류 양식장${\cdot}$가두리의 방양한도를 산정하는데 기초자료로 쓰일 수 있는 용존산소 수지를 해석해 보기 위하여 실시하였다. 가두리에 수용된 당년생 방어 2,800kg이 1일간 소비하는 산소량은 $3.09g/m^3$였고, 가두리 안의 수체에 의하여 소비되는 산소량은 $1.24g/m^2{\cdot}day$였으며, 수중 식물성 플랑크톤에 의해 생산공급된 산소량과 대기로 부터 해수중으로 녹아 들어간 산소량의 합계는 수중 유기물의 분해와 플랑크톤의 호흡을 포함하는 수조자체의 산소소비량의 $43\%$를 감당하는 수준이었고, 그 나머지 $57\%$와 사육어가 소비하는 다량의 산소는 가두리 안밖으로 교류하는 해수유동에 의하여 공급되고 있었다. 이 어장의 가두리에 수용할 어체량은 해수교환율에 의해 결정되는 듯이 보이며, 어장내의 조류에 대한 가두리 배치방식에 따라 해수교환율이 달라지게 될 것이므로 가두리마다의 해수유통에 따라 수용량을 조정할 필요가 있다 하겠다.

• 한국해양생명과학회지
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• 제7권2호
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• pp.163-170
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• 2022

본 연구에서는 해상가두리 양식장에서 북방전복과 둥근전복속 교잡종(왕전복♀^*둥근전복♂)의 생물지표를 분석하여 교잡육종의 결과를 평가하고자 하였다. 생존율은 북방전복과 유사하였으나, 성장(각장)은 교잡종에서 약 10% 빠른 것으로 분석되었다. 패각의 호흡공 기형율은 교잡종이 북방전복보다 약 6% 낮았으며, 패각 함몰 및 부식율은 교잡종이 약 15% 낮았다. 생화학적 조성에서는 조단백질의 경우 교잡종에서 약 3.1% 높았으며, 이를 제외한 나머지에서 유사한 값을 나타냈다. 소화, 흡수 및 해독기능을 수행하는 간췌장의 조직학적 평가에서는 교잡종에서 좋은 결과를 보였다. 이러한 결과로 보아 둥근전복속 교잡종은 추후 양식 환경에 접목하였을 때 높은 양식 생산력을 가질 것으로 판단된다.

• 수산경영론집
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• 제29권1호
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• pp.121-137
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• 1998

This study was conducted to examine the economic evaluation of the newly developed fish meal analog (BAIFA-M) in Korean rockfish feed. A raw fish feed (MP) and two commercially formulated diets (EP) were employed to compare weight gain (WG), feed conversion ratio (FCR) and survival rate (SR) from the sea cage culture system. By using the economic model in the practical sea cage culture system, feed cost, production cost and gross profit per kg production, rate of profit to gross revenue (RPGR), and internal rate of return (IRR) were calculated based upon the results of the experiment and the information of the private aquaculture farm (Young Chang) in Tong young, Korean. IRR criteria is one of the popular economic feasibility analysis methods applicable far aquaculture industry. This is an economic evaluation method to compare the given interest rate or the discount rate with IRR which can be calculated by the difference between the present value of the benefit stream and of the cost stream. The benefits of using EP on WG, FCR, SR, and production cost will be emphasized in this study. Fish averaging 20$\pm$3.6g (Mean$\pm$SD) were randomly distributed in each small cage (6m$\times$6m) as groups of 2,000 fish. By using 3 large size cages (12m$\times$12m), 12 small cages were constructed, and only 9 small cages were employed for three replicates of each diet treatment. To compare with MP diet, two sinking EP diets were designed by our laboratory and produced by the local feed company who wanted to promote these EP diets for the mass cage culture of Korean rockfish in the future. Two EP diets contain white fish meal and/or BAIFA-M as the main animal protein sources : WFM diet, maximum 43% of white fish meal : BAIEA- M diet, 30% of white fish meal nab replaced by BAIFA- M from WFM diet. Results are summarized in Table 1. Fish fed MP diet showed significantly lower SR than does fish fed two EP diets(P<0.05). However, there Were no significant difference on FCR among fish fed three practical diets. Table 1. Average feed conversion ratio (FCR), accumulative average survival rate (SR) and economic evaluation data far three practical diets. As we expected, BAIFA-M diet is more economical than WFM diet as well as MP diet. Feed cost and production cost per kg production from BAIEA - M diet were lower than those from WFM and MP diets. Moreover, gross profit per Kg production, RPGR and IRR from BAIFA- M diet were higher than those from WFM and MP diets. This economic evaluation study clearly indicated that MP diet should be replaced by the commerical formulated EP diets as soon as possible in the near future because MP diet is not economical in the practical sea cage culture system.

• 해양환경안전학회지
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• 제16권4호
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• pp.381-386
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• 2010

본 연구에서는 경남 통영 욕지도에 참치양식용 내파성 가두리 설치시 Cochlodinium polykridoides 적조 발생에 대한 적정 침강 깊이를 설정하기 위하여 장시간 동안 C. polykrikoides의 수직이동 현상을 조사하였다. 욕지도 근해의 식물플랑크톤 총 세포밀도는 월별에 따라 매우 큰 변동폭을 보이고 있으며, 대부분 규조류가 우점종으로 출현하고 있다. 여름철 와편모조류의 종 조성을 보면 Gymnodinium sp.가 총 19회로 가장 많은 출현 횟수를 보였고, 특히 C. polykrikoides도 총 8회로 나타났다. 또한 Karenia brevis 및 Fibrocapsa japonica와 같은 유독성 적조생물도 출현하여 이 지역에서 식물플랑크톤에 대한 장기적 모니터링이 필요할 것이다. 일출과 일몰에 따른 Chl-a 농도의 변화와 총 세포수의 변화는 상호 유의한 상관성을 나타내어 부침식 가두리 양식장은 표층으로부터 최소한 3m 침강시켜야 C. polykrikoides 적조로 인한 피해를 현저히 감소시킬 수 있을 것이다.

• 수산해양기술연구
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• 제51권2호
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• pp.155-162
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• 2015

Abalone (Haliotis discus hannai) is a shellfish that feeds on kelp and, as a product, it can often achieve a high market value. However, the dissolved oxygen (DO) levels in coastal waters in Korea have been negatively impacted by pollution from many anthropogenic sources. Herein, a computational fluid dynamics (CFD) software package was used to analyze the distribution of the DO concentration within an abalone containment structure. A finite volume approach was used to solve the Reynolds-averaged Navier-Stokes equations combined with a $k-{\varepsilon}$ turbulence model to describe the flow. The distribution of DO was determined within the control volume domain, and the transport equations of the pollutants were interpreted using a CFD model. The CFD analysis revealed that more than 60% and 30% of the relative oxygen concentration in one and two containers, respectively, was maintained when the flow acts along the six sheets of polyethylene plates. Therefore, it is clear that the abalone plate shelters should be placed parallel to the flow.

• 한국어류학회지
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• 제28권4호
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• pp.229-238
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• 2016

본 연구는 능성어 부상란과 침강란의 아미노산 분석을 통하여 난의 생존에 필요한 요소를 구명하고, 사육환경 및 먹이에 따른 난질의 변화를 난의 생화학적 분석을 통하여 난질에 영향을 미칠수 있는 요소를 구명하기 위하여 수행하였다. 그 결과 육상수조에서 사육하는 것보다 해상가두리에서 사육할 때 난질이 우수하였고, 서로 다른 먹이를 공급한 후 배란을 유도하여 난의 특징을 조사하였다. 그 결과 배합사료만 공급하거나 배합사료와 생사료를 혼합급이한 것보다는 생사료만을 급이한 어미에게서 우수한 수정란을 얻을 수 있었다. 그리고 부상란과 침강란의 아미노산을 분석한 결과 부상란에서 유리아미노산의 함량이 높았으며, 배합사료만 급이하거나 배합사료와 생사료를 혼합 급이한 경우 보다는 생사료만을 공급한 경우 수정란의 유리아미노산의 함량이 높았다. 즉, 난질이 우수할수록 유리아미노산의 함량이 높았다.

• 한국패류학회지
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• 제30권3호
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• pp.273-279
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• 2014

The mass mortalities have been occurring of Korean scallop Patinopecten yessoensis from 1997's to now in Korea east sea. Cages behavior and interference effect (common name; curtain effect) between scallop cages were investigated in culture grounds on the eastern coastal waters of Korea for understand to mechanism of rising about mass mortalities of Korean scallop quickly. The first experiment was carried out in circulating water channel to assess inclination angel from relationship between velocity and cages interval, velocity with culture cages position. An angle of inclination of scallop culture cages were 94.6 to 92.3 degree under a several velocity which were from 0.1 m/s and 131.9 to 118.1 degree under 0.5 m/s with cages interval were 1 m, 94.3 to 91.0 degree under velocity is 0.1 m/s and 133.2 to 122.4 degree under 0.5 m/s with cages interval were 1.5 m and 94.6 to 96.4 degree under velocity is 0.1 m/s and 131.7 to 131.8 under 0.5 m/s with cages interval were 2 m. The second experiment was designed to prove the tank test. Velocities were measured inside and outside of the scallop culture ground at eastern sea of Korea. The velocity of inside of the culture was the slowest as 0.1m/s. In this result, interference between former cage and after cage was occurred.

• 수산해양기술연구
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• 제52권1호
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• pp.17-23
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• 2016

This study investigates the development of an automatic lightening buoy that can indicate an aquaculture cage at night or in rough weather. The energy for the light is generated by the linear motion of a magnet along with a coil inside the buoy as the waves cause the buoy to oscillate up and down. The principle of the magnet motion is different between the magnet and body of the buoy because the movement of the latter is dependent on the surface wave, while the former is affected by the damper. To obtain a quantitative performance of the buoy, the voltage as well as up and down motion produced by several waves were measured in the wave tank. A shorter wave period, i.e., faster motion, of the magnet produced a brighter light. It is expected that this study can aid in deciding the optimum design of a buoy capable of producing a bright light at any aquaculture site affected by sea or fresh water waves.

• 한국패류학회지
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• 제30권4호
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• pp.353-361
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• 2014

동합금이 사육 생물에게 미치는 생리적 영향을 조사하기 위해 화학적 조성이 다른 5종류의 금속판을 넣은 수조에서 사육한 북방전복을 대상으로 성패와 치패의 생존율, 호흡 및 배설률 그리고 기관별 중금속 축적률을 조사하였다. 생존율은 치패와 성패가 각각 27-60%와 63-83%로 성패가 더 높게 나타났다. 합금 조성에 따른 생존율의 뚜렷한 차이는 나타나지 않으나 중금속 축적률 그리고 영양적인 스트레스 등을 고려하면 동합금망은 전복 양성을 위한 가두리로서는 적합하지 못할 것으로 사료된다.