• 한국수산과학회지
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• 제18권3호
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• pp.214-218
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• 1985

서울 근교의 유통과정에서 생선 및 생선 통조림을 선발하여 히스타민, 총 휘발성 염기 및 트리메틸아민의 함량을 계절에 따라 조사하였다. 생선의 경우 히스타민은 육중에 $1.7{\sim}6.0mg\%$을 함유하였고 계절에 따른 차는 별로 나타나지 않았으나 10월에 구입한 염장 고등어가 $11.2mg\%$으로 가장 높았다. 총 휘발성 염기는 계절에 관계없이 $17{\sim}40mg\%$로 비교적 유사한 값을 보였고 트리메틸아민도 $3.5{\sim}7.0mg\%$으로 시료에 따라 큰 차이가 없었다. 생선 통조림의 경우 10월에 구입한 고등어 통조림에서 히스타민 $19.6mg\%$, 총 휘발성 염기 $56.3mg\%$, 트리메틸아민 $8.4mg\%$로서 다른 제품에 비해 약간 높은 경향을 보였으나 시료와 계절에 따른 큰 차이는 없었다. 결론으로 서울 지방에서 현재 유통되는 생선 및 생선 통조림은 히스타민과 관련되는 독성 문제는 없는 것으로 판단 되었다.

• 한국수산과학회지
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• 제46권4호
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• pp.393-398
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• 2013

The purpose of this study was to determine how an ornamental fish, such as the fighting fish, Betta splendens would respond to the use of freshwater live-prey, such as rotifers Brachionus calyciflorus and water fleas Moina macrocopa. Ingested quantity, digestive velocity and somatic growth were compared between larvae fed a freshwater rotifer and those fed boiled yolk. Food efficiency and somatic growth were compared between larvae that were fed freshwater water fleas and those fed a micro-diet developed for flounder ($250{\mu}m$, I-hwa Ltd.). The number of rotifers ingested by larvae reached a maximum of 191 per day. However, based on the number ingested per hour and the digestive velocity of consumed rotifers, the maximum ingestible and digestible number of rotifers was calculated to be 272 per day. A maximum of 67 individuals (mean, 49.8 individuals) could be completely digested within the 1-h period from 90 to 180 min after feeding. Somatic growth was enhanced in larvae that were fed rotifers compared to those fed boiled yolk. Larvae exhibited greater growth at rotifer densities of 30 and 40 per mL than at lower densities. Among the water-flea (M. macrocopa and Bosmina sp.) and micro-particle diets, feeding with M. macrocopa resulted in the greatest somatic growth of larvae during the water-flea feeding stage.

• 한국수산과학회지
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• 제50권3호
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• pp.311-318
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• 2017

Four species of sea turtles (Chelonia mydas, Caretta caretta, Dermochelys coriacea, and Eretmochelys imbricata) have been recorded in Korean waters. However, nationwide surveys on the distribution and occurrence of each species have rarelybeen conducted in Korean waters. In this study, we comparatively analyzed the trends in occurrence of sea turtles and their morphological characteristics based on 148 reliable observations and stuffed specimen data and suggested Korean names for each species. Chelonia mydas (57 cases, 58.8%) and C. caretta (52 cases, 31.5%) were dominant species, and occupied > 90% of all observations. Most of observations of sea turtles in Korean waters were obtained through stranding (61 cases) and incidental catches (62 cases). A coastal set net was the main fishing gear for incidental catches (82%). Sea turtles were found mainly around Jeju-do and the Korea Strait from June to November. Most C. caretta found were adults, whereas most C. mydas were juveniles. Additionally, we provide detailed morphological characteristics of C. mydas (n=8) and C. caretta (n=4) using stuffed specimens. Finally, based on a literature search, we suggest appropriate Korean names, such as "Pureunbada-geobuk" for C. mydas, "Bulgeunbadageobuk" for C. caretta, "Jangsu-geobuk" for D. coriacea, and "Maeburibada-geobuk" for E. imbricate.

• 인터넷정보학회논문지
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• 제18권4호
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• pp.89-97
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• 2017

본 논문은 스마트 교육을 위한 청소년의 우울과 휴대폰 의존도, 부모의 양육행동, 또래관계의 구조적 관계를 확인하고자 하였다. 또 청소년의 우울과 휴대폰 의존 관계에서 부모양육행동과 또래관계의 매개적 효과를 확인하였다. 본 연구는 한국아동, 청소년패널 조사(KCYPS) 6차년도 중1패널의 자료 중 총 1897명의 청소년 응답과 보호자의 설문데이터를 분석대상으로 하였다. 자료분석을 위해 SPSS와 Amos프로그램을 사용하였다. 대상 변인들의 상관 및 기술통계분석을 위해서 SPSS을 사용하였고 부모의 양육행동의 경로분석과 매개효과 검증을 위해 구조방정식을 이용하였다. 검증결과, 청소년의 우울과 부모의 양육행동은 청소년의 휴대폰 의존도에 직접적인 영향을 미치는 것으로 나타났다. 그리고 청소년의 우울은 부모의 양육행동을 통해 간접적인 영향을 미치는 것으로 나타나 부분 매개효과를 확인할 수 있었다. 하지만 또래관계의 매개효과는 나타나지 않았다. 이상의 결과로부터 청소년의 휴대전화 의존을 예방하기 위한 방안과 스마트 교육 개발시 유의점에 등에 대해 논의하였다.

• 수산경영론집
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• 제32권2호
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• pp.73-89
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• 2001

The market conditions of sea mustard is changing by overproduction, decreasing price, Import of blanched and salted sea mustard from China into Korea domestic market and increasing market share of sea mustard of China in Japan. In addition, the price support program in sea mustard aquaculture must be modified due to the restriction of domestic support by international organization such as WTO. There are two ways to solve those problems. First is that finding a way to solve the overproduction of sea mustard. One of possible ways is the production adjustment by Marketing Order. Second is that finding an alternative way to replace price support program. The possible way is Direct Payment instead of purchase stockpile system. To introduce marketing Order, outlook center, organization of self-management, production adjustment through output control measure, improvement of market structure, and education/publicity arc necessary. Also, to implement marketing order, setting a model business by government is required. There are two steps for implementation of marketing order. First step is to construct Order Committee including organization of producer, people related marketing. However, this committee must run by government for certain short-term. Second step is to improve quality of product and acceleration of demand. At visual point that enforcement of the first step is completed, government has process that government transfers Order Committees self-correcting. It is desirable that government only conduct the support acts such as quality improvement and acceleration of demand. Also, at early stage it is necessary to have aid system for marketing order For example, we can expect that income increase by production adjustment in long run. However, in short run the income of producer may decrease so, it is required to compensate his economic lose. For compensation, The useful means that can be utilized is direct payment. Direct payment is not continued policy. Also, when production adjustment policy such as Marketing Order has effective results, Direct Payment as an assistant measure must be reduced or abolished. Therefore, when production adjustment acts as an effective tool to control overproduction, Direct Payment system.

• 한국수산과학회지
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• 제37권6호
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• pp.469-477
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• 2004

This study examined distributional patterns of Asterias amurensis in Tongyeong, the central South Sea of Korea. The density of the sea star was estimated at 10 chosen sites in the inner and the outer parts of the Tongyeong coast from December 2000. The mean density of the species in this area was $2.4ind./m^{2}$. The seasonal surveys conducted at 3 arbitrary chosen sites (i.e., sea cage, reef and soft sediment) also showed that the abundance of the species at the sea cage site $(density:\;3.6\;ind./m^{2};\;biomass:\;250.7\;gwwt/m^{2})$ was significantly higher than at the reef site $(density:\;1.7\;ind./m^{2};\;biomass:\;63.5\;gwwt/m^{2})$ and the soft sediment site $(density:\;0.4\;ind./m^{2};\;biomass:\;18.9\;gwwt/m^{2})$. Densities were higher at sea cages areas than at reefs and soft bottom sites. At sea cage site, A. amurensis population exhibited a strong aggregated distributional pattern. In contrast, at reef and soft bottom sites, A. amurensis population showed a random distributional pattern. The spatial difference in prey species and its abundance was the primary factor determining the spatial heterogeneity of the sea star in its behavior characteristics. Experiments on the feeding preference indicated that A. amurensis had a strong selectivity on its prey, but this selectivity varied between populations living in different sites. In particular, A. amurensis populations at the reef site showed a strong selectivity on various sessile and mobile animals living in reef areas, suggesting that these animal groups may play a role as "windows for the survival of A. amurensis". These results suggest that the distribution of A. amurensis in Tongyeong is closely associated with abundance of prey species and the bottom composition.

• 한국수산과학회지
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• 제30권5호
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• pp.744-752
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• 1997

광양만 대도주변 잘피밭 (eelgrass bed)에서 van Veen grab을 이용하여 1년간 (1994년 $1\~12$월) 매월 대형저서 동물을 채집한 결과, 총 60종이 채집되었으며, 이 중 갯지렁이류가 32종으로 가장 많이 채집되었다. 그 다음으로는 갑각류에 속하는 단각류, 십각류, 등각류 등의 순으로 채집되었다. 가장 많이 채집된 종은 Platynereis bicanaliculata, Cirratulus cirratus, Cirriformia tentaculata, Lumbrineris longifolia로써 전체 채집 개체수의 약 $63.7\%$ 정도를 차지하고 있었다. 그 외, Maldane cristata, Glycera chirori, Capitella capitata, Hemipodus yenourensis, Nephtys polybranchia, Ericthonius pugnax 등이 비교적 많이 채집되었다. 잘피밭에서 저서동물의 출현량은 계절 변동이 뚜렷하였는데, 채집 종수 및 개체수는 겨울에 최소치를 보였으나, 봄에 증가하기 시작하였고, 여름에 최대치를 보였다. 계절별 우점종을 살펴보면, 봄과 여름에는 Platynereis bicanaliculata, Cirriformia tentaculata, Lumbrineris longifolia가 우점하였으며, 가을에는 Cirratulus cirratus, Capitella capitate, Opisthobranchia 등이 우점하였다.

• Fisheries and Aquatic Sciences
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• 제18권2호
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• pp.211-220
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• 2015

We investigated the differences in the expression of the neurohormones kisspeptin (Kiss) and gonadotropin-inhibitory hormone (GnIH) and cytochrome P450 aromatase (P450arom), gonadotropin hormones (GTHs), and sex steroids in the goldfish Carassius auratus exposed to light-emitting diodes (LEDs). The expression levels of Kiss1, Kiss2, G-protein-coupled receptor 54 (GPR54), GTHs, GnIH, and P450arom were compared between the control (white light) and LED-treated goldfish. Furthermore, we measured the plasma levels of follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The levels of Kiss1 mRNA and protein; Kiss2, GPR54, and $GTH{\alpha}$ protein; GTH mRNA; and plasma FSH and LH in the hypothalamus and cultured hypothalamus cells were significantly higher in the green and purple LED treatment groups than in the other groups. These results suggested that red LEDs inhibit the sex maturation hormones, Kiss, GPR54, GTHs, and P450arom, and that GnIH plays a role in the negative regulation of reproductive function in goldfish.

• 한국수산과학회지
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• 제51권1호
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• pp.31-41
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• 2018

Seaweeds are composed of a variety of bioactive substances, including polysaccharides, pigments, minerals, peptides, and polyphenols. Among these substances, the arsenic content of seaweeds has been a significant cause for concern. The present study evaluated the toxicity of arsenic from three species of seaweed using a zebrafish Danio rerio model. The arsenic-rich extracts were obtained from Ecklonia cava (ECAE), Undaria pinnatifida (UPAE) and Hizikia fusiformis (HFAE) using a solvent of 50% methanol and 1% $HNO_3$. We investigated the toxicity of the arsenic-rich extracts in zebrafish embryos through survival rate, heart rate, yolk sac edema size, cell death, reactive oxygen species (ROS) production and real-time polymerase chain reaction (PCR). The hepatotoxicity of arsenic-rich extracts was assessed in the liver of adult zebrafish through real-time PCR and histopathology. The survival rates of embryos and adult zebrafish showed no significant changes at any concentration. At 100 ppm, embryos did not exhibit significant differences in heart rate, yolk sac edema size, cell death or ROS production. In addition, apoptosis-related genes in larvae and liver tissue were unaffected by treatment with arsenic-rich extracts. These data will help clarify that developmental changes, hepatic oxidative stress, and apoptosis are not associated with toxicity from arsenic-rich seaweed extracts in a zebrafish model.

• 대한수의학회지
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• 제53권1호
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• pp.49-54
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• 2013

To investigate the transmission pattern of geographical area and temporal trends of the 2010~2011 foot-and-mouth disease (FMD) outbreaks in Korea, and to explore temporal intervals at which spatial clustering of FMD cases space-time analysis based on georeferenced database of 3,575 burial sites, from 30 November 2010 to 23 February 2011, was performed. The cases represent approximately 98.1% of all infected farms (n = 3,644) during the same period. Descriptive maps of spatial patterns of the outbreaks were generated by ArcGIS. Spatial Scan Statistics, using SaTScan software, was applied to investigate geographical clusters of FMD cases across the country. Overall, spatial heterogeneity was identified, and the transmission pattern was different by province. Cattle have more clusters in number but smaller in size, as compared to the swine population. In addition, spatiotemporal analysis and the comparison of clustering patterns between the first 7 days and days 8 to 14 of the outbreak revealed that the strongest spatial clustering was identified at the 7-day interval, although clustering over longer intervals (8~14 days) was also observed. We further discussed the importance of time period elapsed between FMD-suspected notice and the date of confirmation, and emphasized the necessity of region-specific and species-specific control measures.