• 수산해양기술연구
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• 제48권4호
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• pp.469-478
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• 2012

To manage, sort, and grade fishery resources, it is necessary to measure their morphometric characteristics. This labor-intensive task involves performing repetitive operations on land and on a research vessel. To reduce the amount of labor required, a vision-based automatic measurement system (VAMS) for the measurement of morphometric characteristics of flatfish, such as total length (TL), body width (BW), and body height (BH), has been developed as part of a database management system for fishery resources management. This system can also measure the mass (M) of flatfish. In the present study, we describe a morphological image processing algorithm for the measurement of certain characteristics of flatfish. This algorithm, which involves preprocessing, edge pattern matching, and edge point detection, is effective in cases where the flatfish being measured has a deformed tail and is randomly oriented. The satisfactory performance of the proposed algorithm is also demonstrated by means of experiments involving the measurement of the BW, TL and BH of a flatfish when it is straightened (BW : 117mm, TL : 329mm, BH : 24.5mm), when its tail is deformed, and when it is randomly oriented.

• 수산경영론집
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• 제53권4호
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• pp.15-26
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• 2022

This paper analyzed the price stabilization before and after the fisheries outlook project for seaweed, flatfish, and abalone. First, the stabilization effect was analyzed through the price variation coefficient before and after the observation project. In terms of the variation coefficient, there was no effect that the price was stabilized through the seaweed outlook project. However, it can be seen that flatfish and abalone have a price-stabilizing effect. Second, as a result of analyzing the price stabilization effect through the improved ARMA-T-GARCH model, it was confirmed that seaweed was not statistically significant while flatfish and abalone had a price stabilization effect by statistically significantly reducing volatility of real prices after the introduction of the fisheries outlook project. Third, as a result of analyzing the factors affecting price stability, it was found that the price of seaweed was stabilized after the WTO, but the Japanese earthquake expanded the price volatility. In the case of flatfish, it was analyzed that the price stabilized after the WTO and the Great Japanese Earthquake. Finally, the price of abalone has stabilized since the WTO and the Great Japanese Earthquake.

• 한국식품영양학회지
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• 제11권6호
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• pp.662-666
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• 1998

The effects of 0.5∼1.0% acetic acid, 0.5% laurice acid, or 0.5% monolaurine against Vibrio cholerae non 01 in flatfish strips stored at 15$^{\circ}C$ were assessed. Control strips were dipped in diatilled water only for 3 min. All treatments significantly (P<0.05) reduced the levels of V. cholerae at initial day. The counts of V. cholerae in flatifish treated with either lauric acid or monolurine were a significantly different (P<0.05) from those of acetic acid treatment after 2 days of storage. The counts of V. cholerae in treatments of 0.5% laurice acid after dipping in 1.0% acetic acid for 3 min were lower than those of treatments with 0.5% luarice acid for 3 min after dipping in 0.5% acetic acid for 3 min. Treatments with 0.5% monolurine for 3 min were not effective in lowering (P<0.05) the counts of V. cholerae after 3 days compared to the control.

• 한국식품위생안전성학회지
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• 제23권4호
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• pp.324-329
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• 2008

본 논문에서는 식품 중 퀴놀론계(QNs) 합성항균제(marbofloxacin, norfloxacin, danofloxacin, ciprofloxacin, enrofloxacin, difloxacin, sarafloxacin, oxolinic acid 그리고 flumequine) 9종을 분석하기 위하여, 액-액 추출 과정을 거쳐서 형광검출기가 장착된 액체크로마토그래피를 이용하여 QNs를 효율적으로 동시 분석하는 방법을 확립하였다. 컬럼은 Zorbax Eclipse XDB-C8($150\;mm{\times}4.6\;mm,\;5{\mu}m$), 이동상 용매는 200mM ammonium acetate buffer (pH 4.5)와 ACN로 기울기 용리를 사용하였으며, 유속은 1.5 ml/min, 그리고, 주입량은 $10{\mu}l$로 설정하여 분석하였다. 확립된 분석조건으로, 표준검정 곡선은 $10-500{\mu}g/kg$의 농도범위에서 상관계수가 0.9989 이상의 양호한 직선성을 나타내었으며, 회수율은 50, 100 그리고 $500{\mu}g/kg$의 농도에서 89.6-106.5%로, 향상된 추출효율을 나타내었다. 검출한계는 $1-16{\mu}g/kg$이었고, 정량한계는 $3-47{\mu}g/kg$이었으며, 일내(intra-day)와 일간(inter-day) 정밀도(CV%)는 0.2-15.0%, 0.5-11.7%이었다. 따라서, 확립된 분석방법은 광어 및 계란 중의 QNs을 효과적으로 분석하는데 이용될 수 있을 것으로 사료된다.

• 한국산학기술학회논문지
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• 제15권10호
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• pp.6084-6091
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• 2014

본 논문은 변동성 비대칭 모형인 GJR GARCH 모형을 이용하여, 수산물 시장에서의 가격변동성과 거래량간의 실증분석을 수행하였다. 실증분석을 위한 연구는 제주지역에서 양식 생산되고 있는 넙치를 분석대상으로 하였다. 주요 연구결과로, 우선 기존의 연구결과와 유사하게 본 연구에서도 양식넙치의 가격변동성에 대한 "변동성 군집(volatility clustering)" 현상이 나타나고 있음을 보였다. 다음으로 양식넙치의 거래량과 가격간에 유의적인 음(-)의 관계가 나타나 일반적인 공급의 법칙이 성립되고 있음을 증명하였다. 마지막으로는 양식넙치의 가격변동성이 거래량의 변동성에 비대칭적으로 반응함으로써 거래물량을 인위적으로 조절할 수 있는 정부정책(비축사업, 수급안정화사업 등)의 유용성을 결론으로 제시하였다.

• Food Science and Biotechnology
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• 제15권3호
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• pp.462-465
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• 2006

In order to extend the shelf life of sliced raw flatfish, the antimicrobial effects of natural essential oil from mustard and a mixture of ginger and mustard essential oils were tested at various temperatures. In addition, volatile components of the mixed essential oils were analyzed using gas chromatography and gas chromatography mass spectrometry. The viable cell counts of Vibrio parahaemolyticus treated with mixed essential oils from ginger and mustard was 0.7-1.3 log CFU/g lower than those of other treatments during storage at $5^{\circ}C$. During storage at $20^{\circ}C$, the viable cell counts of V. parahaemolyticus, V. vulnificus 01, and V. vulnificus 02 treated with the essential oils increased slightly from 6.53-6.64 log CFU/g at initial stages to 6.77-7.72 log CFU/g after 24-hr of storage, however they were 1.38-1.97 log CFU/g lower than those of the control group (8.74-9.10 log CFU/g). These results show that the growth of V. parahaemolyticus and V. vulnificus inoculated on sliced raw flatfish could be inhibited by treatment with natural essential oils from ginger and mustard at $5^{\circ}C$ of storage. However, the antibacterial effects of the essential oils on Vibrio species observed in this study were not sufficient to merit their use in sliced raw flatfish at temperatures exceeding $20^{\circ}C$.

• 농업과학연구
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• 제48권4호
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• pp.815-829
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• 2021

The purpose of this study is to construct a flatfish outlook model that is consistent with the "Fisheries outlook" monthly publication of the fisheries outlook center of the Korea Maritime Institute (KMI). In particular, it was designed as a partial equilibrium model limited to flatfish items, but a model was constructed with a dynamic ecological equation model (DEEM) system, considering biological breeding and shipping times. Due to limited amounts of monthly data, the market equilibrium price was calculated using a recursive model method as the inverse demand. The main research results and implications are as follows. As a result of estimating young fish inventory levels, the coefficient of the young fish inventory in the previous period was estimated to be 0.03, which was not statistically significant. Because there is distinct seasonality, when estimating the breeding outcomes, the elasticity of breeding in the previous period was found to exceed 0.7, and it increased more as the weight of the fish increased, in addition, the shipment coefficient gradually increased as the weight increased, which means that as the fish weight increased, the shipment compared to the breeding volume increased. When estimating shipments, the elasticity of breeding in previous period was estimated to respond elastically as the weight increases. The price flexibility coefficient of the total supply was inelastically estimated to be -0.19. Finally, according to a model predictive power test, the Theil U1 was estimated to be very low for all of the predictors, indicating excellent predictive power.

• Fisheries and Aquatic Sciences
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• 제5권1호
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• pp.64-74
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• 2002

The proper conditions for cold storage of milt in four species of flatfish were investigated. Various diluents were tested for the preservation of marbled sole, brown sole, starry flounder and olive flounder milt at $1\pm0.5^{\circ}C$ for 7 days. The most effective diluent was $1\%$ NaCl for marbled sole and Stein's extender for brown sole, starry flounder and olive flounder. After 7 days of storage in different dilution ratios (milt: diluent), marbled sole milt diluted with 1:3-10 and brown sole, starry flounder and olive flounder milt diluted 1:1-10 maintained good sperm activity index (SAI). SAI was affected by storage volume and presence of antibiotic. SAI was lower after 7 days storage in the volume of 1.5 mL than in 0.5 or 1.0 mL. SAI after 29 days storage was markedly enhanced by addition of antibiotic in marbled sole (400 ppm gentamicin, 400 ppm neomycin, 200-400 ppm streptomycin), brown sole (600 ppm gentamicin), starry flounder (1,000 ppm gentamicin) and olive flounder (200-1,000 ppm gentamicin, 200-400 ppm neomycin, 200-1,000 ppm streptomycin).

• Fisheries and Aquatic Sciences
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• 제5권2호
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• pp.87-96
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• 2002

The physico-chemical properties of fresh milt of marbled sole, Limanda yokohamae, brown sole, Limanda herzensteini, starry flounder, Platichthys stellatus and olive flounder, Paralichthys olivaceus among flatfishes, and the fine structure of their cryopresserved spermatozoa were investigated. The highest concentration of sperm among these four species was $3.60\pm1.35\times10^{10}/mL$ in marbled sole. Osmolality and pH of seminal plasma in four flatfish species were approximately 330 mOsm/kg and 7.6-8.1, respectively. Seminal plasma compositions showed interspecific differences. The sperm heads of marbled sole, brown sole and starry flounder were ellipsoidal and that of olive flounder was round. The numbers of mitochondria of these four species were eight in marbled sole, seven in brown sole and starry flounder, and six in olive flounder. Cross-sectional view of flagellum showed typical 9+ 2 structure in all species. Most of sperms cryopreserved with a proper method had no visible ultrastructural changes after freeze-thawing, compared with the fresh sperm, but in a few cases, swelling of their heads and midpiece regions were observed.

• Fisheries and Aquatic Sciences
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• 제14권1호
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• pp.62-69
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• 2011

The effects of actively stimulating devices (ASD) on juvenile flatfish escape were studied to increase escape rates from the cod end by encouraging fish to approach the net wall. Two kinds of ASD were designed: a fluttering net panel, i.e., a free-end flag-like net panel, and a double conical rope array. Escape responses of juvenile bastard halibut were observed in a circulating water channel using two model cod ends, one made with diamond-shaped 43-mm-mesh-size polyethylene (PE) as a high-contrast cod end and the other with polyamid (PA) mono-ply as a low-contrast cod end. Retention rate was significantly lower with the double conical rope-array ASD in the PE cod end than with conventional PE cod ends only or the fluttering net-panel ASD inside the PE cod end. Mean retention rate with the low-contrast PA cod end was also significantly lower than that with the high-contrast PE conventional cod end. Therefore, active fluttering devices using a double conical rope array together with less visible low-contrast netting in the cod end could help to reduce the bycatch of juvenile flatfish by weakening their optomotor response and actively driving fish to the side net panel.