• Environmental Analysis Health and Toxicology
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• 제24권4호
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• pp.311-320
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• 2009

The short term (24-hr) and long term (21 days) effects of copper, cadmium, fenbendazole and sulfathiazole on the survival of the Korean fairy shrimp Branchinella kugenumaensis were evaluated. The 24-hr median lethal concentrations ($LC_{50}$) of copper, cadmium, fenbendazole, and sulfathiazole were 39, 512, 182, and 31,818 ${\mu}g/L$, respectively. The toxicity of copper is highest among 4 chemicals used in this study, while sulfathazole the lowest. After the long term (21 days) exposure experiment, the $LC_{50}$ copper, cadmium, fenbendazole, and sulfathiazole were 1.12, 2.1, 0.1, 6.6 ${\mu}g/L$, respectively. The long term effects of antibiotics were highly enhanced while the short-term effects were not strong. The sensitivities of B. kugenumaensis to copper and cadmium were higher than or comparable to those of other freshwater branchiopods (Streptocephalus spp., Thamnocephalus sp.), and far higher than the marine species (Artemia sp.). There were significant effects on the survival of B. kugenumaensis after long term exposure to relatively lower concentrations of copper, cadmium, fenbendazole and sulfathiazole. Therefore, B. kugenumaensis seems quite a good candidate species for the ecotoxicological assessments of freshwater environments.

• 센서학회지
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• 제30권3호
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• pp.154-164
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• 2021

RAS(Recirculating aquaculture system) 방식 또는 바이오플락 기술를 사용한 흰다리 새우의 육상 양식을 통해서 새우 개체의 생존율과 고밀도 생산율을 향상시키기 위한 양식의 원리 및 장치 구성, 국내외 수질 모니터링 센서, 현재의 양식 모니터링 시스템의 문제점 파악 및 미래의 양식 모니터링을 위한 대책을 분석 하였다. 흰다리 새우 양식을 위해서는 수조별 온도, pH, DO, 염도 측정이 기본적으로 필요하며, 암모니아성 질소, 질산성 질소, 아질산성 질소, 생장 관리를 위한 이온성 물질의 측정이 필요하다. 특히 센서재질에 있어서는 SUS304도 부식이 되는 고염도 환경에서 견딜수 있어야 하며, 고탁도 및 부유물질에 의한 생물 부착에 견딜 수 있는 센서가 사용되어야 한다. 또한 내구성 및 측정값 신뢰도, 가격 경쟁력 있는 센서 및 시스템 공급이 필요하다. 바이오플락 양식 환경에서는 고염분, 고부유물 환경에서 견딜 수 있는 센서의 내구성과 데이터 안정성, 신뢰도가 무엇보다 중요하다. 향후 흰다리 새우 및 수산 양식을 위한 최적 양식환경을 확보하기 위해서는 양식 생육 환경 현장의 수질을 측정하고 적정 환경을 결정하며, 자동제어 시스템을 이용하여 제어하고 축적된 데이터를 활용 및 분석하여 지능적으로 관리하는 기술을 개발하는 것이 필요하다.

• Environmental Analysis Health and Toxicology
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• 제22권2호통권57호
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• pp.171-175
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• 2007

Indigenous species means a species that is likely, due to historical presence, to occur at a specified site for some portion of its life span. Therefore, indigenous species can be useful as an indicator to assess environmental risk caused by hazardous chemicals in a specific site. So far a few toxicity studies using freshwater species which are indigenous to Korea have been carried out. In this study, a freshwater shrimp (Neocardina denticulata) indigenous to Korea was used for acute toxicity test of heavy metals. Neocardina denticulata were exposed to cadmium chloride $(CdCl_2)$, copper chloride $(CuCl_2)$ and zinc chloride $(ZnCl_2)$ using automatic flow-through system for 96 hours. The 96h LC50s were calculated as 0.043 $(0.042{\sim}0.045)mg\;CdCl_2/L,\;0.104(0.098{\sim}0.113)mg\; CuCl_2/L\;and\;2.021\;(1.633{\sim}2.594)mg\;ZnCl_2/L$. When compaired with some international standard species such as medaka(Oryzias latipes), Neocardina denticulata had high sensitivity. Therefore, this study suggested that Neocardina denticulata have possibilities for a sensitive test species to test heavy metal toxicity in aqua-system.

• 한국가정과교육학회지
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• 제12권2호
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• pp.47-64
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• 2000

The purpose of this study was to search the calcium and iron rich foods in Korean people. The food sources presented in the current home economics textbooks of middle and high school were investigated. And 40 kinds of calcium and iron rich foods were selected by the quantity in 100g edible portion. one serving size and according to 1997 food supply data. Also 3 major food groups of calcium and iron supply in Korean were identified, and 10 rich foods for each food groups were selected. The results were summarized as follows. 1. The food sources of calcium 1) The food sources of calcium presented in the home economics textbooks of middle and high school are milk and dairy products. small fishes such as anchovy icefish and dried strip and green vegetables etc. 2) The calcium rich foods by 100g edible portion were in order of skim milk powder river snail sesame sea mustard. whole milk powder. snapping turtle loach sea tangle(dried) opossum shrimp and sea lettuce(dried). And the calcium rich foods by the calcium content in one serving were in order of river snail snapping turtle opossum shrimp loach spiny lobster skate skim milk powder small alaska pollack freshwater crab condensed milk whole milk powder skate ray and milk. 3) The 3 major calcium supply food groups in Korean were vegetables fish and shellfishes and milk and dairy products. 4) The calcium supply foods according to the quantity of food supply in 1997 was in order of sea mustard, milk anchovy chinese cabbage soybean skin milk powder laver shrimp welsh onion and maize. The vegetables were the important sources of calcium in Korean. 2. The food sources of iron 1) The food sources of iron which are commonly presented in the textbooks of middle and high school were meat liver egg(egg yolk) and green vegetables etc 2) The iron rich foods on the basis of the iron content in 100g edible portion were in order of surf clam marsh clam laver(dried)( sea lettuce(dried), crayfish pelilla seed little neck clam orient hard clam, venus clam, and freshwater carab. And the iron rich foods by the iron content in one serving were in order of surf clam marsh clam crayfish little neck clam orient hard clam freshwater crab venus clam hen cockle green confertii(fresh) pen shell and spiny lobster. 3) The 3 major iron supply food groups in Korean were cereals an cereal products fishes and shellfishes and vegetables. 4) The iron supply food according to the quantity of food supply in 1997 was in order of soybean sea mustard maize rice meat edible viscera laver wheat flour, pook, red pepper, egg and bovine meat.

• 한국식품과학회지
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• 제28권6호
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• pp.1111-1118
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• 1996

본 연구는 토하(Caridina denticulata denticulata)의 식품학적인 우수성을 밝히기 위하여 식품성분 중 맛과 밀접한 관계를 가지고 있는 함질소 엑스성분을 상세히 분석한 후 그 성분조정을 파악하는 한편, 이와 비교하기 위하여 바다에서 어획되는 젓새우(Acetes japonicus)에 대해서도 동일한 이화학 성분들을 분석하여 그 성분 차이를 검토함으로써 토하에 대한 맛의 특성을 구명하고자 하였다. 토하는 1994년 12월부터 1995년 11월 사이에 전남 나주군에서 양식된 것을, 그리고 젓새우는 1994년 12월과 1995년 11월 전남 신안군에서 어획된 것을 시료로하여 엑스분질소, 유리아미노산, oligopeptide류, 핵산관련물질, betaine류, 4급 암모늄염기, 구아니시노화합물 등을 분석하였다. 토하는 젓새우보다 엑스분질소, 유리아미노산, oligopeptide류, 핵산관련물질의 함량이 높은 편이었고, 젓새우는 토하보다 homarine, trimethylamine oxide, trimethylamine이 높은 편이었으며, creatine과 creatinine은 토하와 젓새우에서 미량으로서 큰 차이가 없었다. 토하의 중요한 유리아미노산으로는 arginine, lysine, glutamine, glutamic acid, pheylalanine, leucine, alanine, asparagine, glycine 등이었고, 젓새우의 중요한 유리아미노산은 arginine, glutamic acid, proline, glutamine, lysine, leucine, glycine, alanine, taurine 등이었다. 그리고 methionine, glutamine, valine 등은 토하와 젓새우에서 그 함량이 같은 수준이었다. 토하에서 가장 함량이 많은 핵산관련물질은 AMP였으며, 젓새우에서는 inosine이었다. 이상의 결과로부터 토하는 맛을 나타내는데 중요한 역할을 하는 대부분의 함질소 엑스성분들의 함량이 젓새우보다 높았기 때문에 식품학적으로 더 우수한 가공원료라고 판단되었다.

• The Korean Journal of Ecology
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• 제23권2호
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• pp.113-116
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• 2000

Different phenological patterns of leaf and fruit fall among native and non-native riparian species provide a spatially and temporally heterogeneous series of alternative food resources for detritivores. Relatively little is known about qualitative differences among these different riparian species. Rates of litter inputs, decomposition, and retention for different sources of riparian litter require long-term documentation. Species of freshwater shrimps, crabs. insects. and gastropods are known to consume a wide range of litter inputs but how these dynamic food webs function under changing climatic and land-use conditions is unknown, especially in tropical streams. On-going studies in the Luquillo Experimental Forest. Puerto Rico provide an example of how inputs of fronds and fruits from palms (Prestoea montana) serve as important foods and microhabitat for species of freshwater crabs and shrimp. Native riparian species such as Prestoea montana are commonly distributed in the Luquillo Mountains especially along steep slopes and stream banks. After tropical storms with high winds, the large fronds from these native riparian trees provide important inputs of leaf litter to the stream food web. In some streams, the input of ripe fruit from non-native trees such as Java plum (Syzigium jambos) also provides a major source of detrital food resources, especially during periods when fruit fall from native species of palms may be limited.

• Journal of Forest and Environmental Science
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• 제31권3호
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• pp.225-234
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• 2015

Mangroves are important coastal ecosystems and are located at the inter-tidal zones of tropical and sub-tropical belts. The global mangrove forests are declining dramatically because of the conversion of forests to shrimp farming, over-exploitation, pollution and freshwater diversion. The Bangladesh Forest Department initiated mangrove afforestation throughout the coastal belts of Bangladesh in 1966 to provide better protection for the coastal communities. Up to 1990, 120,000 ha of mangroves had been planted and it is one of the largest coastal afforestaton programs in the world. The objective of this study is to exploit the spatial extent of mangrove plantation and their dynamics of changes over the last two decades using multispectral Landsat imagery. The study area covers the coastal areas of Bangladesh that is extended over the eastern part of Sundarbans up to Teknaf, the southern tip of mainland Bangladesh. Mangrove plantations were interpreted visually on computer screen and interactive delineation of forest boundary was done. The mangrove plantation area has been estimated as 32,725, 47,636 and 43,166 ha for the year of 1989, 2000 and 2010, respectively. Mangrove deforestation by human activity has increased almost six times in the recent decade in comparison to the previous one. The mangrove forest loss due to coastal erosion has slightly declined in the 2000s. Mangroves have been lost primarily because of agricultural expansion. The result of this investigation will be helpful to understand the dynamics of mangrove plantation and the main drivers of changes in this coastal ecosystem.

• 한국식품과학회지
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• 제41권5호
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• pp.490-497
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• 2009

본 연구에서 확립한 분석법으로 총 393건의 시료를 분석한 결과 넙치에서 아목시실린 9건, 장어에서 옥소린산 4건과 플루메퀸 1건이 검출되었다. 아목시실린의 검출농도는 0.009-0.078 mg/kg의 범위를 나타내었고, 옥소린산의 검출농도는 0.02-0.20 mg/kg의 범위를 나타내었다. 플루메퀸은 잔류허용기준(0.5 mg/kg) 이하의 농도로 장어 1건(0.03 mg/kg)에서 검출되었다.

• 한국수산과학회지
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• 제3권1호
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• pp.71-76
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• 1970

낙동강에서의 징거미 (M. nipponensis)의 상대 성장을 암수별로 조사한 결과 두흉갑장과 체장의 회귀 관계는 암수사이에 유의의 차가 없었으나 제2보각의 각절은 뚜렷한 차이가 있었고 그 회귀 관계는 다음과 같다. 1. 두흉갑장(X)과 체장(Y) : Y=2.68996X+1.14784 in female. Y=2.73121X+1.10827 in male 2. 두흉갑장(X)과 기절(Y) : Y=0.16910X-0.06422 in female Y=0.19410X-0.06075 in male 3. 두흉갑장(X)과 좌절(Y) : Y= 0.48524X-0.10812 in female. Y= 0.69052X-0.28616 in male 4. 두흉갑장(X)과 장절(Y) : Y=0.51217X-0.04088 in female. Y= 1.9792X-0.98258 in male 5. 두흉갑장(X)과 완절(Y) : Y=0.87701X-0.33919 in female. Y=2.00091X-1.64116 in male 6. 두흉갑장(X) 전절(Y) : Y= 1.04672 X-0.50727 in female. Y=2.67663X-2.40488 in male 7. 두흉갑장(X) 과 지절(Y) : Y=0.26366 X+0.15743 in female. Y=1.04866 X-0.67781 in male

• 한국환경보건학회지
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• 제45권3호
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• pp.285-294
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• 2019

Objectives: For suitable risk management of the domestic aquatic environment, it is necessary to conduct toxicity tests using species native to Korea. In the present study, we performed toxicity ring tests using endemic freshwater arthropoda Neocaridina denticulata and evaluated its validity and reproducibility as an international standard test species. Methods: To evaluate the sensitivity levels of N. denticulata to hazardous chemicals, toxicity values for several chemicals were compared with other standard test species. Intra- and inter-laboratory acute toxicity tests were performed both within a single laboratory and among four laboratories respectively using 3,4-Dichloroaniline, which is generally used as a reference test substance in fish toxicity tests. In addition, intra- and inter-laboratory coefficient of variations (CVs) were calculated to evaluate reproducibility based on the estimated toxicity values. Results: The sensitivity of N. denticulata to several chemicals was found to be similar with D. manga, indicating that the species is valid as a test species. The CVs of the intra- and inter-laboratory tests were 22.946% with four qualified runs and 8.828% among the four laboratories, respectively. Conclusions: N. denticulata serves in an important role in the food chain of Korean aquatic ecosystems and also inhabits several other Asian countries. Since the validity and reproducibility of the species were confirmed as a toxicity test species in this study, further efforts are needed to establish N. denticulata as the international standard test species for the appropriate risk assessment of aquatic ecosystems at home and abroad.