• 한국해양환경ㆍ에너지학회지
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• 제7권4호
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• pp.159-163
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• 2004

본 연구는 한국의 서남해 연안의 새우 양식장을 대상으로 pH, 염분, 용존산소, 암모니아질소 및 황화수소와 같은 새우 양식장의 수질과 저질을 조사한 후, 새우 양식장의 수질과 저질을 개선할 수 있는 방안을 모색하고자 하였다. 즉, 맑은 날씨와 흐린 날씨로 구분하여 현장의 새우 양식장에서의 용존산소의 일 변화를 측정한 결과, 정도의 차이는 있었으나 정오부터 오후 6시까지 증가하다가 점점 감소한 후 새벽 6시 경에 최소값을 보인 후 다시 점점 증가하는 경향을 보였다. 이와 같은 결과는 새우 양식장의 관리가 취약한 새벽녘에 용존산소의 부족으로 인해 새우가 질식사 학 수 있으며, 계속적인 저 산소는 저질을 악화시켜 암모니아질소나 황화수소의 농도를 증가시킬 수 있음을 시사하므로 지나치게 용존산소가 낮은 경우와 용존산소가 지나치게 높은 경우에는 인위적 또는 자동적으로 용존산소를 조전할 필요가 있는 것으로 판단되었다. 또한, 현장의 새우 양식장에서의 암모니아 질소는 새우 양식장의 수질 기준을 초과하는 0.172-2.298 ppm으로 높게 나타나고 있었고, 황화수소 농도도 새우 양식장의 농도 기준을 훨씬 상회하는 0.075 ppm까지 나타나고 있어 암모니아질소의 생성 억제와 황화수소의 발생 억제가 새우 양식장의 수질관리에 있어 중요한 요인임을 알 수 있었다.

• Fisheries and Aquatic Sciences
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• 제25권4호
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• pp.214-230
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• 2022

Loss and damage have become a vital contemporary issue in climate change studies and actions in developing countries. However, studies are scant on this in the fisheries sector around the world. In Bangladesh, there is no study on the loss and damage in fisheries dependent communities. This study assesses economic and non-economic loss and damage to coastal shrimp farms due to cyclone Bulbul in Gabura Union of Shyamnagar Upazila, Satkhira district, using a mixed method approach. Results show that all shrimp farms' dependent communities are affected by cyclone Bulbul to some extent. About 14%, 57%, and 29% of the farms were totally, heavily and moderately damaged due to farm inundation and dyke damage. The estimated mean loss and damage per shrimp farm was worth USD 4,633. Around 31% and 72% of the farms' fencing nets and traps were lost, which was worth USD 333 per farm. There were also loss and damage to other resources such as houses, solar panels, livestock and agricultural crops where the estimated mean loss and damage per household was worth USD 3,170. This study reported that the rich shrimp farmers encountered proportionately more economic loss and damage than their poor counterparts. However, this does not mean that the poor suffered less. The current study found a range of non-economic loss and damage in different aspects of the shrimp farmers' household members such as unbearable mental pain, deterioration of health, physical injuries, disabilities, etc. and access to services (e.g., inadequate food, lack of safe drinking water, lack of medical facilities, disruption of education systems), social infrastructure (e.g., damage of roads and markets) and disturbance of cultural functions. The findings suggest that urgent short- and long-term actions may be taken to save the aquaculture farms and dependent livelihoods from economic and non-economic loss and damage to cyclones in future.

• Journal of Microbiology and Biotechnology
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• 제17권3호
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• pp.511-515
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• 2007

White-spot syndrome virus (WSSV) is a devastating, infectious virus affecting shrimp. Although sensitive techniques involving PCR have been developed to assist farmers in screening shrimp (brood stock) for WSSV prior to stocking ponds, such practices have not yet been applied in Korea. Despite the rationality of implementing screening, there has been some doubt as to whether the stocking of WSSV-PCR-negative fly epidemiologically decreases white-spot disease outbreaks. Here, we report a retrospective analysis of data from shrimp farms in the western coast of Korea where WSSV-PCR-negative brood stocks were used to stock rearing ponds. A total of 366 shrimp from Heuksan Island were sampled for WSSV with PCR. Of the tested shrimp, 7.2% (28 brood stocks) were identified as WSSV positive; only WSSV-PCR-negative shrimp were used for brood stocks. Total unit production (final shrimp production/ the area of the ponds) was higher, at 1.96, in ponds where WSSV-PCR-negative shrimp were used, as compared with 1.02 in other ponds in Korea in 2004. This retrospective analysis of WSSV in Korea may be useful to the shrimp aquaculture industry, suggesting a testable hypothesis that may contribute to the eventual control of WSSV outbreaks.

• 한국전자통신학회논문지
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• 제19권1호
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• pp.209-216
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• 2024

육상 새우 양식장은 연안 양식에 비해 생장 환경을 보다 안정적으로 제어할 수 있어 고품질의 대규모 생산에 유리하다. 최적의 새우 생장 환경을 유지하기 위해서는 물의 순환, 적정 수온 유지, 산소 공급, 사료 공급 등 다양한 요소들을 관리해야 한다. 특히, 적절한 수질 관리가 되지 못하면 새우 폐사로 이어지기 때문에 양식장에 24시간 사람이 상주하여 지속적으로 관리해야 하는 어려움이 있다. 본 논문에서는 이러한 문제를 해결하기 위하여 최소한의 인력으로 운영 가능한 육상 양식장 통합 모니터링 시스템을 제안한다. 제안된 시스템은 IoT 기술을 활용하여 육상 양식장의 실시간 영상, 펌프 상태, 수질 데이터, 에너지 사용 현황을 수집하여 서버로 전송한다. 관리자는 웹 인터페이스 및 스마트폰 앱을 통해 서버에 저장된 양식장의 상황을 언제 어디서나 실시간으로 확인하고 필요한 조치를 취할 수 있다. 따라서 관리자가 양식장에 상주할 필요 없이 현장 작업 시간을 크게 줄일 수 있다.

• 한국수산과학회지
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• 제56권1호
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• pp.133-139
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• 2023

The advantage of biofloc technology (BFT) in aquaculture is in the prevention of pathogenic transmission. In this study, we performed an investigation on viral, bacterial, and microsporidian parasite infections targeting a total of 194 whiteleg shrimp Litopenaeus vannamei reared in seven BFT-farms on the west coast of Korea in 2021. Hepatopancreatic and cuticular epithelium and pereiopods tissues of shrimp were tested for the four pathogens, Enterocytozoon hepatopenaei (EHP), Vibrio parahaemolyticus causing Acute Hepatopancreatic necrosis disease (VP_AHPND), white spot syndrome virus (WSSV), and hepatopancreatic parvovirus (HPV). The microsporidian parasite EHP was detected in the hepatopancreatic tissue of BFT whiteleg shrimp in the Ganghwa region, whereas no other pathogenic bacteria or virus was detected on the shrimp in the seven BFT-farms. As a result of bacterial flora in the rearing water of BFT whiteleg shrimp using DNA microbiome technology, V. chemaguriensis and V. alfacsensis were contained at 0.05% and 0.01%, respectively, but no VP_AHPND was detected. These findings will serve as a basis for supporting safe BFT-aquaculture of whiteleg shrimp.

• 스마트미디어저널
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• 제12권3호
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• pp.112-119
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• 2023

Shrimp farming has been becoming a new source of income for fishermen in South Korea. It is often necessary for fishers to measure the size of the shrimp for the purpose to understand the growth rate of the shrimp and to determine the amount of food put into the breeding pond. Traditional methods rely on humans, which has huge time and labor costs. This paper proposes a deep learning-based method for calculating the size of shrimps automatically. Firstly, we use fine-tuning techniques to update the Mask RCNN model with our farm data, enabling it to segment shrimps and generate shrimp masks. We then use skeletonizing method and maximum inscribed circle to calculate the length and width of shrimp, respectively. Our method is simple yet effective, and most importantly, it requires a small hardware resource and is easy to deploy to shrimp farms.

• 유통과학연구
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• 제19권4호
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• pp.53-60
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• 2021

Purpose: This study focuses on exploring ways to improve the distribution method of shrimp farming so that it is eco-friendly and increases the distribution of shrimp. Research design, data and methodology: The experimental device installed in a biofloc shrimp culture in one area tested 10 times. Complex odor, concentration of H2S, water quality improvement effected by decomposition of organic substances, and degree of microbial activation measured. The data of the experimental results verified using the T-test technique, and the p value was determined based on the significance probability of 0.05. Results: This experimental device was effective in reducing odor and hydrogen sulfide in shrimp farms. With the improvement of water quality, dissolved oxygen increased due to the microbubble and cavitation action of air ejector and ultrasonic waves. In addition, the cultured microorganisms in the cultured water treated by the experimental device were remarkably proliferated compared to the raw water. Conclusions: The biofloc distribution method has a significant effect on improving water quality and reducing odor substances and will become a new eco-friendly and efficient distribution method for shrimp farming in the future.

• Asian-Australasian Journal of Animal Sciences
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• 제16권7호
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• pp.1025-1029
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• 2003

The effect studied was that of the feeding of shrimp by-product meal, as a source of eicosapentaenoic and docosahexaenoic acid, on growth performance and fatty acid composition of adipose tissue in growing pigs kept on small holdings in Central Vietnam. Shrimp by-product meal was exchanged with ruminant meal so that the diets contained either 0, 10 or 20% shrimp byproduct meal in the dry matter. The diets were fed on 6 different small-holder farms. The farmers fed a base diet according to their personal choice, but were instructed as to the use of shrimp by-product and ruminant meal. The diets were fed to the pigs from 70 to 126 days of age. There were three animals per treatment group per farm. The diets without and with 20% shrimp by-product meal on average contained 0.01 and 0.14 g docosahexaenoic acid/MJ of metabolisable energy (ME). Due to the higher contents of ash and crude fiber, the shrimp by-product meal containing diets had lower energy densities than the control diets. Eicosapentaenoic acid was not detectable in adipose tissue; the content of docosahexaenoic acid was generally increased after consumption of shrimp by-product meal. In spite of the concurrent high intakes of ash and crude fiber, the feeding of shrimp by-product meal had a general stimulatory effect on growth performance of the growing pigs. The intake of docosahexaenoic acid or its content in adipose tissue was not related with average daily gain. It is suggested that shrimp by-product meal may contain an unknown growth enhancing factor.

• 해양환경안전학회지
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• 제21권2호
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• pp.130-139
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• 2015

본 연구에서 순천만 일대 새우 양식장 부근에서 이뤄지는 태양광 발전에 따른 소음영향평가방법을 진단하였다. 순천만 폐양식장에 태양광 발전시설이 설치되는 경우, 임계거리 17미터 이내에 위치한 새우양식장 $S_2$와 $S_3$(15미터 이격)은 소음에 대한 저감대책을 수립하지 않은 상태로 작업할 경우에는 악영향이 나타날 수 있다. 소음 스트레스를 감소시키기 위해 방음 판넬을 설치할 시, 본 연구에서 고려한 공사장비 최저효율(Case A), 일반효율(Case B), 최고효율(Case C)에 대한 수중소음 환경목표기준을 만족하는 것으로 나타났다. 건설 장비에서 발생되는 대기 소음이 수중으로 전파될 경우, 보다 합리적인 계산을 통해 수중 소음도 예측과 함께 주변 양식장에 미치는 누적 영향에 대한 심도 있는 평가 및 대책 수립이 필요하다.

• 한국어병학회지
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• 제33권1호
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• pp.71-75
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• 2020

A survey was conducted to investigate viral infections in 184 whiteleg shrimp (Litopenaeus vannamei) collected from nine farms and one wholesale fish vendor during 2018 and 2019. Gill and abdominal muscle of shrimp were tested for the presence of five viruses, viz. infectious hypodermal and haematopoietic necrosis virus, taura syndrome virus, infectious myonecrosis virus, yellow head virus genotype 1, and covert mortality nodavirus by reverse transcription-polymerase chain reaction (RT-PCR) and PCR. These viruses were not detected in any of 184 samples, screened under the study.