• Title/Summary/Keyword: fish farming environment

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Community structure of Macrobenthic Fauna under Marine Fish Culture Cages near Tong-yong, Southern Coast of Korea (통영 인근 가두리 양식장 지역의 저서동물군집구조)

  • PARK Heung-Sik;CHOI Jin-Woo;LEE Hyung-Gon
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.33 no.1
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    • pp.1-8
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    • 2000
  • Benthic environments and composition of macrobenthic fauna around the marine fish culture cages were studied to clarify the effect of fish farming near Tongyong from August, 1995 to february, 1996. Sediment grain size and bottom dissolved oxygen under the fish cages were similar to that of a control site, but organic content was higher under the cages. Fewer species were found under the fish cages than under the control site, but conspicuously higher density was obtained under cages. Capitella capitals, Nebalia bipes were dominant infauna, and Asterina pertinifera and Astelias amurensis were dominant epifauna under the fish cage whereas Lumbrineris longifolia and Anphioplus sp. dominated in the control site. Diversity index showed seasonal variation under the fish cages, but showed little variation at the control site. The benthic fauna under the fish cages showed different community structures from the control site. As results, the fish culture cages affected the benthic environment and the community structure of benthic fauna by input of the organic content and biological effects such as dead shells.

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Big Data Analysis on Oyster Growth and FLUPSY Environment (개체굴 성장 데이터와 양식 FLUPSY 환경 데이터의 빅 데이터 분석)

  • Yoo, Hyun-Joo;Zhang, Sung-Uk;Jung, Sun-Jin
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.7
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    • pp.106-111
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    • 2020
  • In the era of the fourth industrial revolution, the application of big data analysis technology is crucial in various industries. In this regard, considerable research is necessary to improve aquafarming productivity, particularly in fish culture, which is one of the primary industries in the world. In this study, a sample experiment using a flop was conducted to improve oyster productivity in fish farms, and a flush was installed in an environment similar to aquaculture farms. Thereafter, the temperature data of the water environment where the formation of burrows considerably improved were collected; the growth rate of burrow seeds was also measured. The gathered experimental data were examined by time series data analysis. Finally, a system that visualizes the analysis results based on big data is proposed. In accord with the results of this study, it is expected that more advanced research on the productivity improvement of oyster aquafarming will be performed.

The Effect of Remodeling Replacement of Photovoltaic Power Generation System in Fish Farm : Analysis of Energy Saving Effect through Simulation (수조식 양식장의 태양광발전시스템 리모델링 교체 효과: 시뮬레이션을 통한 에너지절감효과 분석)

  • Choi, Hyunseok;Na, Jonghyuk;Lee, Hyunyoung;Noh, Jayeop
    • Current Photovoltaic Research
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    • v.9 no.1
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    • pp.11-16
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    • 2021
  • In the past, marine pollution caused by radioactivity and wastewater discharge caused mass destruction. As an alternative, the land farming system became common and operational. In recent years, safety and environmental problems caused by declining population due to aging of fishermen and underdeveloped facilities have always been lurking, so improvement is urgently needed. As part of the new renewable energy 3020 plan announced by the government in 2017, a new model was proposed to improve the environment as well as save energy when the roof of a water tank farm was remodeled into a solar power system. Study, when the existing roof was remodeled and replaced with a water tank farm in Busan as an empirical model, the energy saving rate was analyzed by comparing the actual electricity consumption and power generation.

Study on Growth Characteristics of Sargassum fulvellum in the Integrated Multi-trophic Aquaculture (IMTA) System

  • Kim, Young-Dae;Park, Mi-Seon;Min, Byung-Hwa;Jeong, Seong-Jae;Kim, Hyung-Chul;Yoo, Hyun-Il;Lee, Won-Chan;Choi, Jae-Suk
    • Journal of Environmental Science International
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    • v.23 no.10
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    • pp.1703-1718
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    • 2014
  • An eco-friendly integrated multi-trophic aquaculture (IMTA) farming technique was developed with the goal of resolving eutrophication by excess feed and feces as fish-farming by-products. A variety of seaweed species were tried to remove inorganic nutrients produced by fish farming. However, there have been few trials to use Sargassum fulvellum in an IMTA system, a species with a relatively wide distribution across regions with various habitat conditions, great nutrient removal efficiency and importance for human food source and industrial purposes. In this regard, our study tried to examine feasibility of using S. fulvellum in an IMTA system by analyzing growth characteristics of the species in an IMTA system comprising of rockfish (Sebastes shlegeli), sea cucumber (Stichopus japonocus) and the tried S. fulvellum (October 2011 - November 2012). We also monitored environment conditions around the system including current speed, water temperature and inorganic nutrient level as they may affect growth of S. fulvellum. S. fulvellum in the IMTA system, which were $15.72{\pm}5.67mm$ long at the start of the experiment in October 2011, grew to a maximum of $1093{\pm}271.13mm$ by May 2012. In September, seaweed growth was reduced to a minimum of $280{\pm}70.43mm$ in length. Then, S. fulvellum began to grow again reaching $325{\pm}196.19mm$ by November 2012. Wet weight of the seaweed was $4.01{\pm}1.89g$ at the start of the experiment and reached a maximum of $109.26{\pm}34.23g$ in May. The weight gradually declined to a low of $15.12{\pm}8.40g$ in September 2012. Weight began to increase once more, rising to $39.27{\pm}21.69g$ by November. During the experiment, the average velocity at the surface and the bottom was 6.5 cm/s and 3.4 cm/s, respectively. The water temperature ranged $5.0-23.5^{\circ}C$, which was considered suitable for growing S. fulvellum. Results of the study indicated no significant differences in inorganic nutrients between pre- and post-IMTA installation. It was thus concluded that S. fulvellum can be a suitable seaweed species to be used in an IMTA system.

Trimethoprim Resistance of Vibrio parahaemolyticus Isolated from the Fish Farm (어류 양식장에서 분리한 Vibrio parahaemolyticus의 trimethoprim 내성)

  • Oh, Eun-Gyoung;Yu, Hong-Sik;Shin, Soon-Bum;Son, Kwang-Tae;Park, Kun-Bawui;Kwon, Ji-Young;Lee, Tae-Seek;Lee, Hee-Jung
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.41 no.5
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    • pp.324-329
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    • 2008
  • Vibrio parahaemolyticus species, which cause acute gastroenteritis in humans, were isolated from farmed fish and seawater and their antimicrobial-resistance pattern and factor were investigated. They exhibited the highest resistance to ampicillin (88.9%), followed by trimethoprim (51.9%) and rifampin (22.2%). The relatively high resistance to trimethoprim was unexpected because trimethoprim was not commonly used in fish farming in Korea. R plasmid related resistance was identified by the treatment of novobiocin (7 ug/mL) and it was named as pVPBW1. A putative trimethoprim resistance gene in 2.0 kb fragment of pVPBW1 was also confirmed.

Potential of fascaplysin and palauolide from Fascaplysinopsis cf reticulata to reduce the risk of bacterial infection in fish farming

  • Mai, Tepoerau;Toullec, Jordan;Wynsberge, Simon Van;Besson, Marc;Soulet, Stephanie;Petek, Sylvain;Aliotti, Emmanuelle;Ekins, Merrick;Hall, Kathryn;Erpenbeck, Dirk;Lecchini, David;Beniddir, Mehdi A.;Saulnier, Denis;Debitus, Cecile
    • Fisheries and Aquatic Sciences
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    • v.22 no.12
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    • pp.30.1-30.11
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    • 2019
  • Marine natural products isolated from the sponge Fascaplysinopsis cf reticulata, in French Polynesia, were investigated as an alternative to antibiotics to control pathogens in aquaculture. The overuse of antibiotics in aquaculture is largely considered to be an environmental pollution, because it supports the transfer of antibiotic resistance genes within the aquatic environment. One environmentally friendly alternative to antibiotics is the use of quorum sensing inhibitors (QSIs). Quorum sensing (QS) is a regulatory mechanism in bacteria which control virulence factors through the secretion of autoinducers (AIs), such as acyl-homoserine lactone (AHL) in gram-negative bacteria. Vibrio harveyi QS is controlled through three parallel pathways: HAI-1, AI-2, and CAI-1. Bioassay-guided purification of F. cf reticulata extract was conducted on two bacterial species, i.e., Tenacibaculum maritimum and V. harveyi for antibiotic and QS inhibition bioactivities. Toxicity bioassay of fractions was also evaluated on the freshwater fish Poecilia reticulata and the marine fish Acanthurus triostegus. Cyclohexanic and dichloromethane fractions of F. cf reticulata exhibited QS inhibition on V. harveyi and antibiotic bioactivities on V. harveyi and T. maritimum, respectively. Palauolide (1) and fascaplysin (2) were purified as major molecules from the cyclohexanic and dichloromethane fractions, respectively. Palauolide inhibited QS of V. harveyi through HAI-1 QS pathway at 50 ㎍ ml-1 (26 μM), while fascaplysin affected the bacterial growth of V. harveyi (50 ㎍ ml-1) and T. maritimum (0.25 ㎍). The toxicity of fascaplysin-enriched fraction (FEF) was evaluated and exhibited a toxic effect against fish at 50 ㎍ ml-1. This study demonstrated for the first time the QSI potential of palauolide (1). Future research may assess the toxicity of both the cyclohexanic fraction of the sponge and palauolide (1) on fish, to confirm their potential as alternative to antibiotics in fish farming.

A Study on the Crevice Corrosion for Ferritic Stainless Steel (페라이트 스테인리스강의 틈부식에 대한 연구)

  • Baik Shin-Young
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.10 no.1 s.20
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    • pp.51-54
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    • 2004
  • In recently days, the breed fish farm is increased in the beach side for farming fish. In such a farm, the heater is requested for preventing freezing in cold season. The heating material are requested high corrosion resistance and strength for endurance high corrosive salt and pressure. In case of low corrosion resistance and/or strength, the heating element shall be broke down and eventually make spillage or leaking contaminated salt. In the most cases, crevice corrosion is localized form of corrosion usually associated with a stagnant solution on the micro-environmental level. In this study, the crevice corrosion of Ferritic type 430 stainless steel is investigated. The size of specimen is $15{\times}20{\times}3mmt$. Test solution is 1N H2SO4 + 0.05N NaCl. The artificial crevice gap size is $0.24{\times}3{\times}15mmL$. Crevice corrosion is measured under applied voltage 300mV(SCE) to the external surface. the result of this study showed that 1) the induced time for initiation of crevice is 750seconds, 2) potential is dropped in the crevice from the top of gap opening from -320 to -399mV. The result confirmed that the potential drop(IR mechanism) in the crevice is one of mechanism for crevice corrosion.

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Antibacterial Effect of Bacteria Isolated from the Plant Rhizosphere against Pathogenic Bacteria of Fish (식물근권에서 분리한 세균의 어류질병세균에 대한 항균활성 효과)

  • Jeong, Ji-Woon;Park, So-Hyun;Kim, Dong-Hwi;Jeun, Yong-Chull;Heo, Moon-Soo
    • Journal of Life Science
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    • v.24 no.7
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    • pp.757-761
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    • 2014
  • Olive flounder (Paralichthys olivaceus) is an important aquaculture fish species in Jeju Island, South Korea. Due to the intensification of flounder fish farming, huge amounts of chemical antibiotics are used against several fish diseases. This has many harmful side effects on fish, as well as human consumers. Hence, an alternative to chemical antibiotic agents is needed for disease control. In this study, three strains of rhizobacteria (BRH433-2, TRH415-2, and THJ609-3) were isolated from the rhizosphere of plants. Assays of their antibacterial activity against fish pathogens, such as S. iniae, S. parauberis, V. anguillarum, and E. tarda, were performed with untreated broth culture (without cell separation), supernatant, and precipitated pellets separated by centrifugation. Among these, the cell suspension prepared from the precipitated pellet showed significant antimicrobial activity when compared with that of the untreated broth culture and centrifugal supernatant. These results indicate that the three isolated rhizobacterial strains exhibit antibacterial activity. Analysis of the 16S rDNA sequences of the BRH-433-2, THJ609-3, and TRH415-2 strains showed the highest similarity to Burkholderia gladioli (99.5%), Pseudomonas baetica (97.7%), and P. koreensis and P. baetica (98.4%), respectively. We suggest that the strains hold promise in disease management of fish.

Asymmetric Transmission between Producer and Wholesale Prices in Farmed Olive Flounder Market (양식넙치 산지-도매가격간 비대칭적 가격전이 분석)

  • Lee, Heon-Dong;Ma, Chang-Mo
    • The Journal of Fisheries Business Administration
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    • v.51 no.4
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    • pp.69-83
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    • 2020
  • The purpose of this paper is to empirically investigate whether asymmetric price transmission exists in the distribution stage of farmed olive flounder market. For the analysis, time series data were used for the producer prices of Jeju and Wando, and the wholesale prices of Incheon, Hanam and Busan. Through the Granger causality test, the causal relationship from the producer price to the wholesale price was derived and the asymmetric price transmission was analyzed using the autoregressive distributed lag model (ARDL). As a result of the analysis, it was found that there is a phenomenon of 'positive asymmetric price transmission' from the producer price to the wholesale price. This result can be one evidence that excess profits are received in the intermediate distribution stage, and can be said to be a result showing the incompleteness and inefficiency of the distribution structure of the farmed olive flounder. In the future, it is required to establish an information-sharing system in all stages of production, distribution, and consumption that can create a competitive environment for distribution participants and resolve information asymmetry. Also, it is necessary to review the distribution center specializing in live fish from the viewpoint of the establishment of new distribution channels and sales diversification strategy under the rapidly changing fisheries environment.

Aquaculture Recycling Effluent from a Pond System Treating Animal Excreta Ecologically (축산폐수 처리 연못시스템의 처리수 재활용 양어)

  • Yang, Hong-Mo
    • Korean Journal of Environmental Agriculture
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    • v.19 no.4
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    • pp.339-344
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    • 2000
  • Utilization of animal excreta in aquaculture can have potentials of high fish production and low maintenance costs for fish farming and it can reduce water pollution caused by animal waste disposal. Integration of wastewater treatment pond system with aquaculture has been utilized in many countries. Ecologically balanced pond ecosystem is formed through the stabilization of wastes, the growth of aquatic plants, and the cultivation of fish. The most appropriate fish for rearing in these ponds are those which can feed directly on phytoplankton, especially algae. Carp were introduced into a tertiary pond - water depth of 2.2 m, water surface area of $130\;m^2$, volume of $148\;m^3$ - of a pond system treating milk cow excreta. The carp production was $125g{\cdot}m^{-2}year^{-1}$ which falls into upper range of $18\;-\;137g{\cdot}m^{-2}year^{-1}$ of treated sewage-fed carp farming of other countries. Average $BOD_5$ and T-N of the pond was 19.8 and $21.0\;mg{\cdot}L^{-1}$ respectively, and the ecological environment of it was suitable for growth of carp. Several carp of 100g were introduced in August into a secondary pond of the treatment system, whose average $BOD_5$ and T-N was 27.9 and $30.8\;mg{\cdot}L^{-1}$ respectively. They were died within one week, which may be attributed to the depletion of dissolved oxygen at dawn. Effluents from primary treatment can be used in fish pond with dilution and those from secondary treatment can be directly funnelled into it. Waste stabilization pond treating animal excreta can be utilized for fish rearing when its water quality maintains secondary treatment level.

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