• 한국식품영양과학회지
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• 제44권5호
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• pp.725-731
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• 2015

감마선 조사된 건조수산품 8종을 electron spin resonance(ESR) 측정법에 의한 조사 처리 여부 가능성을 알아보았다. 연체류 3종(꼴뚜기, 오징어, 한치) 및 건조어류 5종(가자미, 갈치, 꽁치, 디포리, 쥐포)의 비 조사 시료와 감마선 조사(1, 5, 10 kGy) 시료를 어육과 골수를 제거한 후 뼈를 건조한 다음 시료로 사용하였다. 그 결과 모든 건조수산품은 조사선량이 증가함에 따라 유의적으로 ESR signal intensity가 증가하였으나 조사 유래 특이 라디칼인 hydroxyapatite는 뼈가 포함된 꽁치, 가자미, 갈치 시료에서 비 조사 및 조사 시료와의 뚜렷한 차이를 나타내어 조사 여부 확인이 가능하였다. 또한 HA ratio를 비교해볼 때 갈치가 가자미 및 꽁치에 비해 hydroxyapatite 라디칼의 생성률이 가장 높은 것으로 확인되었으며 조사선량이 증가할수록 증가하였다. 그러나 꽁치는 5, 10 kGy, 가자미와 갈치는 모든 조사 처리구에서 확인이 가능한 반면, 연체동물인 꼴뚜기, 오징어, 한치의 경우 조사 유래 특이 라디칼이 확인되지 않았다. 따라서 본 연구에서는 8종의 건조수산품 중 연체류를 제외한 뼈를 포함한 건조어류 가공품에 대하여 ESR 적용 가능성을 확인하였다.

• 수산해양기술연구
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• 제52권3호
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• pp.183-190
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• 2016

This study carried out an experiment to find out the reaction of hairtail, Trichinus lepturus to the colors of LED light as a basic study on the development of the trolling gear and a method to enable the day-night operation. We used hairtails caught around Seongsan-po, Jeju Island by set nets and hairtail angling. The seven hairtails of the average length 68.9 cm (SD 9.2 cm) and the average weight 135.9 g (SD 47.9 g) were adapted themselves in the experimental water tank, 15 m Self-Governing 1.7 m in height and 1.5 m in depth, and then they were studied. We conducted experiment at the Ocean and Fisheries Research Institute in Jeju Special Self-Governing Province, from November to December 2015, and the sea surface temperature was between 16.5 and $19.5^{\circ}C$. The four colors of LED light, blue, white, green and red, were set up to transmit downward from the marginal area of tank. The 1 meter depth light intensity of LED colors is as follows: $0.09w/m^2/s$ (blue), $0.18w/m^2/s$ (white), $0.04w/m^2/s$ (green) and $0.007w/m^2/s$(red) To know the optimum LED color light, we selected one with better reaction rate after comparison of two colors simultaneously and the selected color was again compared to the other color in a tournament style two times a day (day and night) and ten times totally. The reaction rates were shown as the frequencies of hairtail appearance for 5 minutes in the lighting zone after turning on the LED lights. The reaction rate of the blue was at 97% unlike the red 3% (p < 0.001). The blue was at 75% unlike the green at 25% (p < 0.001). The blue was at 67% unlike the white at 33% (p < 0.001). Therefore, the color of light source showing the highest reaction rate was the blue.

• 수산경영론집
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• 제29권2호
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• pp.77-96
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• 1998

Fisheries products in Korea generally go through three markets, namely the wholesale market at production site (Market A), the wholesale market at consumption site (Market B), and the retail market (Market C), from producers to end consumers. As the products move from Market A through Market B to Market C, the marginal gap of prices asked in these markets demonstrates an apparent relationship. The producers, middlemen, consumers, and governmental departments concerned may influence the marketing prices of fisheries products. This study employing the cointegration theory tries to investigate whether causality of the price-setting among these markets exists and, if any, what it is. The authors have focused their attention on fisheries markets in Pusan, analyzing the long-run equilibrium relationship and causality between the prices of hairtail and squid among markets at different levels. Data used in this study cover the period f개m August 1984 to December 1997 fer hairtail, and the period from May 1989 to December 1997 for squid. The main findings of the study may be summarized as follows: First, regardless of the price time-series of hairtail and squid in individual market, the first difference is necessary fur satisfying the stationary conditions since each time-series is a first integration. This means homogeneous integration of time-series, which is a requirement of the long-run equilibrium of prices at different markets, is satisfied. Second, the study of the long-run equilibrium relationship between the prices at Market A and Market B shows that a long-run equilibrium relationship does exist for selling prices of the two species at Market A and Market B. Third, the ECM (error correction model ) used here to describe the long- and short-run dynamics of price change demonstrates that, in the case of squid, the price change in Market A will lead to a corresponding price change in Market B in the long-run period. In the short-run, however, the price at Market H is not only influenced by the price change in Market A but influence the price at Market A as well, that is, the Prices between Market A and Market B have a feedback effect. It should be stressed that the limitation in data collection, which cover only two species of hairtail and squid, is likely to cause a sampling bias. Nonetheless, we may conclude that a dynamic relation in the formation of prices does exist in view of the transaction amount of species at different markets. It is believed that the conclusion drawn from this study would not only contribute to a long-lasted debate on the direction of causality of price-setting among academic circle and fishing community, but would provide a useful standard for the policy makers in charge of the price-setting of fisheries products as well.

• 한국어류학회지
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• 제17권3호
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• pp.173-186
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• 2005

한국과 대서양산 갈치 (Trichiurus lepturus) 2지리적 집단으로부터 genomic DNA를 분리 추출하였다. 선택된 8개의 RAPD primer를 이용하여 common, polymorphic 그리고 specific fragment를 얻어냈다. 2지역으로부터 primer간 banding patterns 의 복잡성이 두드러지게 나타났다. DNA fragment 의 분자적 크기는 150 bp에서부터 3,000 bp까지 커다란 차이를 나타내었다. 본 연구에서 한국산 갈치 집단에서는 947개의 fragment가 나타났고, 대서양산 갈치 집단에서는 642개의 fragment 가 확인되었다. 또한 한국산 집단에서는 148개의 specific fragment (15.6%) 가 확인되었으며, 대서양산 갈치집단에서는 61개의 specific fragment (9.5%)가 발생되었다. 한국산 갈치집단에서는 638개의 common fragment가 나타났으며, 이는 primer 당 평균적으로 79.8개의 fragment 로 확인되었다. 또한 대서양산 갈치집단에서는 429개의 common fragment 가 확인되었고, 평균해서 primer 당 53.6개의 common fragment 가 나타났다. 한국산 갈치집단과 대서양산 갈치집단의 polymorphic fragment는 각각 76개와 27개로 확인되었다. 모든 갈치시료의 평균적인 bandsharing value를 기초로 해서 한국산 갈치집단의 similarity matrix를 조사해 본 결과 0.784 로부터 0.922까지 나타났고, 대서양산 갈치집단의 값은 0.833로부터 0.990까지 확인되었다. 결과적으로 대서양산 갈치집단내 개체의 bandsharing value 평균값은 한국산 갈치집단의 평균값보다 높게 나타났다. 8개의 primer를 사용하여 얻어진 dendrogram은 cluster 1 (KOREAN 01~KOREAN 11) 및cluster 2 (ATLANTIC 12~ATLANTIC 22)와 같이 2개의 유전적 클러스터로 나뉘어졌다. 한국산 갈치집단내의 10번째 개체(KOREAN no. 10)와 11번째 개체(KOREAN no. 11) 사이가 가장 가까운 유전적 관계(genetic distance = 0.038)를 나타내었다. 궁극적으로 볼 때 한국산 갈치집단의 1번째(KOREAN no. 01)와 대서양산 갈치집단의 16번째(ATLANTIC no. 16) 개체 사이가 가장 먼 유전적 거리(genetic distance = 0.708)를 나타내었다.

• 한국수산과학회지
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• 제26권4호
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• pp.363-368
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• 1993

어획량의 단기 예측은 자원관리에 있어 중요한 항목이지만 전통적인 개체군 모델은 수산자원 관리에 있어 실제적으로 요구되는 예측력이 크게 부족하다. 다종 또는 생태계 모델도 요구되는 매개변수의 수가 많아 실제적 적용이 어렵다. 반면에 단변수 시계열 분석법은 시계열 자체에서 변동성에 관한 특성을 추정하여 이를 토대로 장래 변동성을 예측함으로 최소한의 자료를 가지고 비교적 정확한 단기예측이 가능하므로 유용성이 높다. 본 연구에서는 ARIMA 시계열 모델을 $1971{\sim}1988$년 간의 한국근해의 월별 갈치어획량 자료에 적용하였다. 여기서 나온 예측치와 분석에 포함되지 않았던 $1989{\sim}1990$년 간의 어획량과 비교하였다. 분석 결과 예측치와 실제어획량이 잘 일치하였으며(r=0.938) 평균상대오차는 $59.5\%$였다.

• 수산해양기술연구
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• 제52권3호
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• pp.220-231
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• 2016

Yield-per-recruit (YPR) analysis is used to provide management guidance for the efficient use of a fish cohort. However, the individual fish price per unit weight of small yellow croaker (Larimichthys polyactis) or hairtail (Trichiurus lepturus) increases dramatically by size in Korea. Therefore, age-based production value-per-recruit (PPR) analysis has recently been developed (Zhang et al., 2014). Since age determination requires a substantial amount of money and time and it is even impossible for some fish species, it is difficult to obtain age information to apply the age-based PPR model. Thus, we attempted to develop an alternative method, which uses length data rather than age information, called the length-based PPR analysis. The results revealed that length-based PPR analysis was much more conservative for stock management than the YPR analysis. Furthermore, the PPR analysis was more economically beneficial than the YPR analysis, which can prevent the fish stock from the economic overfishing. In conclusion, the length-based PPR analysis could be a proper approach for stock assessment in the case that the individual fish price per unit weight increases dramatically by size, and this analysis is useful to obtain vital management parameters under data-deficient situation when traditional stock assessment methods are not applicable.

• 수산해양기술연구
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• 제38권1호
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• pp.1-10
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• 2002

1. 제주해협에서는 6월에 가장 낮은 생물량 분포를 나타내었고, 가을철(11월)에 가장 높은 생물량 분포를 보이면서 높은 2차 생산력을 보이는 것으로 사료된다. 2. 해황 및 습중량과의 관계에서 가장 높은 분포를 나타내는 정점은 각각 정점 14와 11로 그 출현위치는 해협의 중앙부분이고, 한국남해연안역 및 제주도 북부연안역에는 다소 낮은 생물량분포를 보이고 있으며, 생물량 분포가 높게 나타나는 해역의 특징은 patch의 형태로 분포하였다 반면 한국남해연안역에 비하여 제주도 북부연안역에높은 생물량 분포를 나타냄으로써 제주해협에서의 갈치어장 형성위치와 생물량 분포와의 관계가 밀접하게 나타날 것으로 판단된다. 그리고, 가을 의 해황 특성인 서로 다른 이질수괴의 경계역인 안상부 해황의 중심에 높은 생물량을 나타냈다. 3. 제주해협에서 patch의 형태로 생물량 분포가 높게 나타나는 해역의 외측에 좋은 갈치어장이 형성되었다.

• 한국수산과학회지
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• 제44권6호
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• pp.695-700
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• 2011

Age, growth, and maturity of Trichiurus lepturus were estimated based on right-handed sagittal otoliths belonging to 1,031 fish collected from January to December 2007 in the East China Sea. The outer margins of the otolith were examined and showed that an opaque zone was formed once per year. Marginal increments in otoliths formed as annual rings between June and August, at the beginning of the spawning season. Fish growth was expressed by the von Bertalanffy growth equation, as follows: $L_t=494.0$ ($1-e^{-0.2453(t+-0.4822)}$) for females and $L_t=330.4$ ($1-e^{-0.4292(t+0.7513)}$) for males, where $L_t$ is the total length in mm and t is age in years. The growth rates of males and females were significantly different (P<0.05).The age composition ranged mostly between ages 2 and 4, and the oldest individuals were 4 years old in males and 6 years old in females. Finally, the age composition of largehead hairtail was compared with data from the 1970s and is discussed in the context of environmental changes.

• 수산경영론집
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• 제41권3호
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• pp.59-78
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• 2010

This paper tries to apply the asymmetrical price transmission(APT) behavior observed in the agricultural industry to supply chains of the domestic fishery industry by a statistical manner. The fore mentioned asymmetrical price transmission refers to when price movements in the later stage of the supply chain do not move in a normal or symmetrical manner corresponding to price movements in the earlier stage of the supply chain. Therefore, when the earlier stage price increase and the later stage price increases to a larger degree, it is called positive(+) asymmetry and the opposite behavior is called negative(-) asymmetry. The study examines the data from domestic producers of three fresh fish types, hairtail, mackerel, and cuttlefish, and tries to examine the price asymmetry between the producer or farm, wholesaler, and retail prices via an APT test utilizing unit root, cointegration, and error correction model. The study found, hairtail wholesale and retail pricing bas a negative asymmetric relationship while mackerel has a negative asymmetric pricing relationship at the producer and retail levels of the supply chain. In the case of cuttlefish, all levels of the supply chain showed negative asymmetrical behavior in the supply chain price transmission, meaning the earlier stage price changes are more rapidly and greatly inputted in the later stage of the supply chain pricing. We believe that the reason why the analysis results show negative price asymmetry is due to the uniqueness of fishery products having an important variable such as freshness. If price increases are greater and quicker than price decreases, then consumer demand, which is sensitive to price increases will decrease and subsequently result in the increase of inventory levels, reducing profits for retailers. Also, frozen hairtail, mackerel, and cuttlefish will act as substitute goods to fresh fishery products. Therefore, fresh fishery products have a high demand of price elasticity. When prices increase, demand quickly decreases. Therefore the profit of wholesalers and retailers to decrease, I think this is the main reason of APT in the supply chain of Korea' s fisheries industry.

• 수산해양기술연구
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• 제45권2호
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• pp.85-95
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• 2009

The fishing lamp is a fishing gear that gathers fish at night. But the cost of oil, which is used to light fishing lamp, has been risen significantly up to 30-40% of total fishing costs. Therefore it is very urgent to develop an energy economical fishing lamp in order to solve the business difficulties of fisheries. Under this background, this research aims at developing a fishing lamp for squid jigging and hairtail angling fishery using the LED, which has excellent energy efficiency and durability. The LED fishing lamp developed can be controlled to fix a fit direction of fish shoal deep because a fishing lamp can be adjustable up and down directions. One unit of fishing lamp has about an 80Watt capacity and the frame of fishing lamp is made of aluminium to emit generated heat of LED to outside. The LED lamp developed was highly durable, only 5.7% of emitting efficiency decreased for 18 months. The illuminance of a unit LED lamp was 2,070lux at 1m and 21lux at 10 m distance, and the intensity of LED lamp system emitted 2,580lux and 400lux at the respective distances. After development of this fishing lamp, 100 units are installed on operating fishing vessels. Experimental results show that energy consumption of squid jigging and hairtail angling was reduced by 40% and 87%, respectively. In conclusion, our methods showed elevated fishing power, compared with traditional fishing method: 37.7% for squid jigging and 24.5% for hairtail angling.