• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.391-392
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• 2001

남극 크릴(Antarctic krill, euphausia superba)은 남극해의 생태계 피라미드의 하위부분을 차지하고 있지만 동물플랑크톤과 고래, 어류, 펭귄, 조류 등의 상위 포식자들을 연결하는 중요한 연결고리의 역할을 하고 있다. 많은 생체량과 남극해 전체에 골고루 분포하고 있는 크릴은 생태계 자체의 연구뿐만 아니라 수산자원 연구의 중요한 부분을 차지하고 있으므로 분포 위치, 자원량에 대한 연구가 최근 들어 활발히 진행되고 있다. (중략)

• Bulletin of Food Technology
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• v.12 no.1
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• pp.12-25
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• 1999

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 1998.06a
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• pp.101-102
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• 1998

• Korean Journal of Food Science and Technology
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• v.22 no.2
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• pp.172-176
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• 1990

Electrocondensation method using aluminum electrodes was developed to remove excess amount of fluoride contained in Antarctic krill. Fluoride amount was reduced differently according to fluoride forms (total, ionic and bound) and sections (whole, muscle flesh and chitinous) of the Antarctic krill during electrocondensation process. Total, ionic and bound fluoride could be reduced by 56%, 35% and 60% of the initial amount contained in the whole body, respectively and reduced by 49%, 57% and 34% of the initial amount in the muscle flesh, respectively by electro condensation process for 120 min. In the case of chitinous section of the Antarctic krill, 68% of total fluoride could be decreased by this process for 120 min.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.29-30
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• 2000

최근, 전자 및 컴퓨터 기술이 눈부신 발달과 더불어 개발된 과학어군탐지기는 해양생물자원을 신속하고도 정확히 평가하는 수단으로서 인정받아 실용화 단계에 있다. 그러나, 계량어군탐지기를 이용한 자원량 추정기술을 보다 더 정도 높고, 효율적인 방법으로서 정착하기 위해서는 선결해야 할 문제점이 몇 가지 있다. 먼저 대상생물의 식별로서 조사하고자 하는 생물과 다른 해양생물과를 식별하는 것이며, 나아가 같은 생물에 있어서도 분포수심, 유영 자세 등에 의해서도 자원의 추정정도가 다르므로 이에 대한 연구가 필요 불가결하다. (중략)

• Journal of Animal Environmental Science
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• v.17 no.1
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• pp.33-38
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• 2011

Economic development involves increase in life expectancy as well as human health care. Consequently, demand for fish meal and fish oil is rapidly growing. In particular, Krill (Eupausia superba) oil product is in high demand due to its rich unsaturated-fatty acid, and thus stable supplies are necessary in the krill oil market. It is required for captured krills to be immediately frozen and stored during ship transport, since proteins of the krill are quickly denatured in natural temperature condition. However, the transportation cost has been sharply increased, which encourages researchers to involve in studies for development of efficient oil extraction process. In this study, a solid/liquid separation technique on boat for the krill oil was developed through triple separation tests using only a separator or using either brush or crusher prior to the separator. The separation tests revealed that the efficiency were 46.2, 60.2 and 60.4 % by the separator, combination with brush, and combination with crusher, respectively. In addition, it was found that byproduct, extracted cake, derived from the separation process could be used as a feed stuff. These results suggest that smashing using the brush or crusher prior to the separator is more efficient than using only the separator.

• Ocean and Polar Research
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• v.26 no.4
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• pp.679-684
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• 2004

To determine if Antarctic krill employ body shrinkage as one of its overwintering mechanisms in the field, Euphauia superba and Euphausia crystallorophias were collected during fall and winter in and around Marguerite Bay through US Southern Ocean GLOBEC field programs during fall and winter 2001 and 2002. The relationships between the body length and weight of both krill species were exponentially correlated with no significant differences between the two species (p>0.05). The ratio between eye diameter and body length of individual krill was examined in an expectation that it could be used as an indicator of the body shrinkage as previously suggested by Shin and Nicol (2002). These ratios were significantly different between the two krill species. Especially, E . crystallorophias had bigger eyes than E. superba. In both krill species, eye diameters were highly correlated with body lengths (regression coefficients ${\geq}0.70$). For E. crystallorophias, no significant differences of the ratio of eye diameter/body length were detected between fall and winter. Even though the ratios for E. superba were seasonally varied, it was not clear whether body shrinkage was an actual and critical overwintering mechanism for the krill population found in this study area. These results suggest that some individuals of E. superba might experience the body shrinkage during a part of their liff, but this morphological index alone (eye diameter/body length) may be insufficient to unambiguously separate the shrunk krill from the non-shrunk ones in the field-collected animals.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.58 no.4
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• pp.352-358
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• 2022

We explored the frequency response of krill target strength (TS) to understand the Antarctic krill (Euphausia superba) and ice krill (Euphausia crystallorophias) using the stochastic distorted-wave Born approximation (SDWBA) model. The results showed that the distribution of orientation and the fatness factor could significantly impact on the frequency response of TS. Krill TS is clearly depended on acoustic properties, which could affect to estimate the biomass of two krill species. The results provide insight into the importance of understanding TS variation to estimate the Antarctic krill and ice krill biomass, and their ecology related to the environmental features in the Southern Ocean.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.32 no.6
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• pp.737-747
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• 1999

To estimate biomass and distribution of the Antarctic krill (Euphausia superba), hydroacoustic survey was conducted on board of R/V Yuzhmorgeologiya, which was chartered by Korea Antarctic Research Program (KARP) group from 18 to 21 December 1998, in the northern part of the South Shetland Islands, Antarctic Ocean, The scientific echo sounder (towing body type) used was EK- 500 (SIMRAD, Norway) with echo integrator (BI-500) at 38 kHz frequency and recorded mean backscattering cross-section coefficient (SA) per 1 $mile^2$ of sea surface. Also, Bongo net sampling was carried out to determine the size of krill and CTD (Conductivity, Temperature and Depth) casting to understand physical structure. Water column was divided into 5 layers (22$\~$65 m, 65$\~$115 m, l15$\~$65 m, 165$\~$215 m and 215$\~$315 m) to know vertical distribution of krill biomass. The standard length of krill collected was between 30 mm and 51 mm, and adult krill had single mode (41 mm). Maximum horizontal length of krill patch was about 35 nautical mile and vertical thickness was about 275 m. High density of krill was appeared in frontal area between Circumpolar Deep Water (>$1^{\circ}C$) and very low temperature water mass (< $-0.5^{\circ}C$) that originate from Weddell Sea. According to the results calculated using target strength equation, krill density was totally higher in continental slope and open water areas than in coastal area. In the study area, krill seems to distribute in depth; density was low at first layer ($\={\rho}=17.0\;g/m^2$) and higher at fourth layer ($\={\rho}=40.19\;g/m^2$). The estimated krill biomass at total survey area and water column was about 2.77 million metric ion ($\={\rho}=151.0\;g/m^2$) and coefficient of valiance ( CV, $\%$) was 19.92. The proportions and biomass of krill biomass at each layer were as follows; layer 1 ($11.3\%$, 0.31 million metric ton, CV=16.24), layer 2 ($13.3\%$, 0.37 million metric ton, CV=34.91), layer 3 ($23.7\%$, 0.66 million metric ton, CV=41.5), layer 4 ($26.6\%$, 0.74 million metric ton, CV=27.84) and layer 5 ($25\%$, 0.69 million metric ton, CV= 26.83).

• Journal of the Korean Society of Food Science and Nutrition
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• v.16 no.4
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• pp.371-378
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• 1987

Free and total amino acids of before and after the heating of the small shrimps were analysed quantitatively, in order to confirm the role of amino acids as important precursors of cooked odor components. Differences of free amino acids contents of the three samples were slightly reconized but free amino acids contents of all sample decreased as about half by heating, It seems that decreased amino acids participate In volatile components of the Small Shrimps. (Sergia lucens Hancen, Euphausia Surperba and Euphausia pacifica Hancen). The amino-carbonyl model reaction was carried out, in order to confirm formation mechanism of volatile compounds of the small shrimps during cooking. The model systems constituted by diluted solutions. of glucose and amino acids (proline, taurine and betaine) the most containing in small shrimps. The volatile odor concentrates of model system were obtained by simultaneous distillation and extraction with Nickerson's apparatus. The odor concentrates of model systems(I, III) had not small shrimp-like odor and main compounds were 1,4,5,6-tetrahydro-2-acetopyridine and 2-acetyl pyridine. In model system II, hetero ring nitrogen and sulfur compounds identified in small shrimps were not did.