• Korean Journal of Fisheries and Aquatic Sciences
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• v.10 no.1
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• pp.37-47
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• 1977

Korea started the Atlantic tuna fishery from 1964 by means of longline, then added bait-boats in 1972. Both fisheries have given the top priority to catch yellowfin tuna(Thunnus albacares). The paper reviews available catch, effort and biological data, estimates some population parameters in order to understand the status of the Atlantic yellowfin tuna as a whole. The main findings are summarized as follows: 1. The total of 476 million hook-equivalent fishing effort was thrown to catch yellowfin tuna in 1974, among which one thired was shared by longliners. 2. The dominant age group becomes younger in both surface and longline fisheries. 3. The recent mortality coefficients were calculated as 1.5 for total mortality and 0.7 for fishing mortality. 4. The weight at recruitment was 2.7 kg in 1973 which was smaller than the regulation size(3.2kg) proposed by ICCAT. 5. The maximum sustained yield was calculated to 95-145 thousand metric tons, which was the level of recent catch. Therefore, it is apparent that the present yellowfin tuna fishery should continue to receive close attention.

• Journal of Fisheries and Marine Sciences Education
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• v.9 no.2
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• pp.222-235
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• 1997

On the basis of the seven species of fish caught by fishing boats with one crewmen belonging to the Iwawada Fisheries Cooperative of Chiba Prefecture, the fishing boats were classified by species with high market values, and the results obtained were reclassified by discriminant function. As a result, the fishing boats were classified into six groups. These six groups are : G1 featuring the main catches of yellowtails ; G2 flounders ; G3 skipjack tunas, G4 squids ; G5 demersal fish, and G6 other miscellaneous species. Furthermore, principal component analysis were carried out on fish catches of the seven species in terms of the value obtained from a catch from the scores of the first, second, third and fourth principal components. The results of analysis show that fishing boats with one crewman can be broadly classified into three groups ; i.e., Groups G1/G2, Groups G3/G4/G5 and Group G6.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.32 no.1
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• pp.68-74
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• 1999

The optimum conditions for selective .elimination of salt from tuna boiled extract (TBE) by electrodialysis were determined. The desalination conditions of TBE were determined at various pH's, concentrations and volumes of TBE. The ion-exchange membrane with a molecular weight cut off 100Da was used for desalting of TBE. The desalination times on $1\%$ and $10\%$ of TBE concentrations were 40 min and 240 min, respectively. The electrodialysis process could removed above $95\%$ of the initial salt content in $1\%$ and $10\%$ of TBE concentrations. The desalination of TBE at pH 4.0 was $14\%$ higher than that at pH 9.0 The amount of water transferred by the electrodialysis was determined. The electrodialysis process could remove above $90\%$ of the initial salt content in $5\%$ TBE for 80 min. The initial volume and the permeate did not have significant effects on desalination time and ratio. The key parameters for the desalination of TBE were pH and concentration of TBA.

• Korean Journal of Food Science and Technology
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• v.34 no.5
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• pp.885-888
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• 2002

Prevalence of food allergic disease was examined by identifying the most common foods implicated in allergic reactions in Korea. Patients were subjected to test determining the amount of specific IgE antibody in serum against food allergens by CAP system. A total 9054 CAP analyses on egg white, egg yolk, cow milk, ${\alpha}-lactalbumin,\;{\beta}-lactoglobulin$, casein, wheat, rice, buckwheat, soybean, peach, crab, shrimp, pork, beef, chicken, tuna, salmon, mackerel, and food mix were undertaken. The results were considered to be positive when CAP value was same and/or greater than +2 (0.7 U/mL). Positive results of CAP analyses were 11.3% (1022/9054 cases), consisting of 336 on egg white, 266 on cow milk, 95 on egg yolk, 76 on soybean, 69 on ${\alpha}-lactalbumin$, 61 on casein, 58 on ${\beta}-lactoglobulin$, 39 on buckwheat, 12 on wheat, 3 on beef, 2 on crab, and 1 on rice, shrimp, pork, chicken or mackerel, and 0 on peach, tuna or food mix. Egg, cow milk, soybean, buckwheat, and wheat were identified as the most common allergic foods in Korea, showing an average of two different food sources for allergy per patient.

• Journal of Radiation Industry
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• v.2 no.1
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• pp.21-26
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• 2008

Although seafood cooking drips were the byproducts from the fishery industry it was known that the cooking drips had many nutrients and could be used as functional materials. Previously, the physiological properties of cooking drips were shown to be increased by a gamma irradiation. But, there was no report on the safe for the genotoxicity on the irradiation. In this study, the genotoxicity of the cooking drips from Hizikia fusiformis, Enteroctopus dofleni and Thunnus thynnus was evaluated by the Ames test (Salmonella typhimurium reversion assay) and the SOS chromotest. The results from all samples were negative in the bacterial reversion assay with S. typhimurium TA98, TA100. No mutagenicity was detected in the assay, both with and without metabolic activation. The SOS chromotest also indicated that the gamma-irradiated seafood cooking drips did not show any mutagenicity. Therefore, this study indicated that gamma irradiation could be used for the hygiene, functional properties and processibility of seafood cooking drips.

• Journal of Nutrition and Health
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• v.40 no.2
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• pp.147-153
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• 2007

In this study, we investigated the anticancer activity of the fin of Thunnus Thynnus (TT). TT was extracted with methanol (TTM), and then further fractionated into four subfractions by using solvent partition method, affording hexane (TTMH), methanol (TTMM), butanol (TTMB) and aquous (TTMA) soluble fractions. We determined the cytotoxicity of these four fractions in four kind of cancer cell lines, such as HepG2, MCF-7, B16-F10 and HT29 by MTT assay. The TTMM showed the strongest cytotoxic effect at the concentration of 150 ${\mu}g/mL$, displaying 95% on the HepG2 cell lines and 82% on MCF-7 cell line. The morphological changes such as membrane shirinking and blebbing of cells were also observed by TTMM treatment in HT29 cell. In addition, we observed that quinone reductase (QR) activity was elevated by only TTMM and TTMH treatments in HepG2 cell. QR activity was increased to around 2.0 and 1.8 times in TTMM and TTMH treated HepG2 cell at 100 ${\mu}g/mL$, respectively, compared to that in control. Although further studies are needed, the present work could suggest that the fin of TT has a potential to be usable as a chemopreventive agent against cancer.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.35 no.3
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• pp.335-342
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• 1999

The purpose of present research is to develop and efficient numerical method for the calculation of potential flow and predict the wave-making resistance for the application to ship design of tuna purse seiner. Havelock was considered the wave resistance of a post extending vertically downwards through the water from the surface, its section by a horizontal plane being the same at all depths and having its breadth small compared with its length. This enables us to elucidate certain points of interest in ship resistance. However, the ship has not infinite draft. So, the problem which is investigated ind detail in this paper is the wave resistance of a mathematical quadratic model in a uniform stream. The paper deals with the numerical calculation of potential flow around the series 60 with forward velocity by the new slender ship theory. This new slender ship theory is based on the asymptotic expression of the Kelvin-source, distributed over the small matrix at each transverse section so as to satisfy the approximate hull boundary condition due to the assumption of slender body. The numerical results using the panel shift method and finite difference method are compared with the experimental results for wigley mono hull. There are no differences in the wave resistance. However, it costs much time to compute not only wave resistance but also wave pattern over some range of Froude numbers. More improvements are strongly desired in the numerical procedure.

• The Journal of Fisheries Business Administration
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• v.51 no.3
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• pp.17-31
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• 2020

The purpose of this study is to identify economic situation on scale of tuna distant longline fishery by analyzing its economies of scale using the cost function. To analyze its economics of scale, the deep-sea fishing statistics were used from 2012 to 2016. In detail, the number of panels for estimating the cost function was 68 tuna distant longline vessels from 2012 to 2016, and the total number of observations over the five years were 340. As a final model, the two-way fixed effect model based on the translog cost function was adopted through the F test, the Breusch-Pagan test and the Hausman test. As a result of the analysis, it was found that tuna distant longline fishery between 2012 and 2014 was diseconomies of scale, the fishery between 2015 and 2016 was economies of scale. However, the economic indicators of the scale from 2012 to 2016 were almost close to zero, indicating that the constant returns to scale, the optimal scale, were reached. Therefore, in the situation where the amount of fishery resources in the world continues to decrease, it is necessary to prepare a method to obtain economic benefits through scale maintenance and reduction rather than indiscriminate scale expansion.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.56 no.1
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• pp.1-10
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• 2020

In the previous study, a shooting trajectory assuming that the purse seine shooting trajectory is a circle was proposed based on the speed and direction of the movement of the fish school. However, in practice, a trajectory that is closer to an elliptical shape than a circular one is often formed. In this study, the existing circular trajectory and the elliptical trajectory methods were compared under the same conditions to confirm the effectiveness of elliptical shooting trajectory. In addition, changes in the eccentricity of ellipses were derived to assess which type of ellipse was appropriate as a shooting trajectory. When a high-speed fish school moves in a straight line, an elliptical shooting trajectory with the eccentricity of 0.7 to 0.9 will be reasonable, and for middle-low speed fish school, an elliptical shooting trajectory with the eccentricity of 0.4 to 0.6 will be more useful than a circle shooting trajectory.

• Journal of Nutrition and Health
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• v.16 no.3
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• pp.185-192
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• 1983

한국인과 한국산 가축의 selenium 영양상태를 파악하기 위하여 남한의 selenium 분포조사를 실시한 결과 전국 45개 지역 토양중 selenium 함량은 0.03 내지 0.24 ppm이였으며 중앙 동북 고산지대는 0.14-0.24 ppm으로 높았고 서해안 그리고 남해안은 0.03-0.06 ppm으로 비교적 낮았다. 전국 42개 지역에서 채취한 목초 (억새, 크로바 )는 0.036 ppm (0.02-0.13ppm )을 함유하고 있으며 콩, 보리, 쌀은 0.047, 0.033 그리고 0.033 ppm selenium을 각각 함유하고 있었다. 전국 23개 도시에 거주하는 204명의 사람에서 채취한 혈액에는 평균 $0.16\;{\pm}\;0.06{\mu}g/m1$ $(0.05-0.35{\mu}g/ml)$ selenium 함량을 갖었고 glutathione peroxidase 활성도는 평균 $13.0\;{\pm}\;1.7\;EU/mg$ homoglobin이었다. 남한에서 생산되는 곡류와 채소류에는 0.02 내지 0.04 ppm의 selenium을 함유하고 육류인 쇠고기, 돼지고기에는 $0.11\;{\pm}\;0.05$와 $0.14\;{\pm}\;0.03\;ppm$을 그리고 참치, 조기, 숭어, 마른멸치등에는 $0.50\;{\pm}\;0.02,\;0.42\;{\pm}\;0.09,\;0.20\;{\pm}\;0.02$ 그리고 $0.55\;{\pm}\;0.04\;ppm$ selenium을 각각 함유하고 있었다. 국민 1인당 하루 selenium 섭취량은 $42.3\;{\mu}g$이며 이중 71 %는 주로 곡류와 채소에서 충당하고 있다.