Marine Environmental Characteristics in the Coastal Area Surrounding Tongyeong Cage-Fish Farms

Jang, Yu Lee; Moon, Hyo‐Bang; Lee, Won‐Chan; Kim, Hyung Chul; Kim, Gi Beum

doi:10.7846/jkosmee.2015.18.2.74

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…The shallow Tongyeong-Geoje coastal area is occasionally affected by water mass exchange in the open western Pacific Ocean and the East China Sea. Many fish and oyster farms are located in this area (up to 263,525 m 2 in Tongyeong coast in 2013, according to Statistics Korea) 23 , discharging waste into the seawater 24 . Harmful algal blooms, especially of Cochlodinium polykrikoides , have frequently occurred in this area over the last two decades from July to August.…”

Section: Introductionmentioning

confidence: 99%

The water depth-dependent co-occurrence patterns of marine bacteria in shallow and dynamic Southern Coast, Korea

Cui

Chun

Baek

et al. 2019

Sci Rep

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To investigate the interactions between bacterial species in relation to the biotic and abiotic environmental fluctuations, free-living (FL), nanoparticle-associated (NP), and microparticle-associated (MP) bacterial community compositions (BCCs) were analyzed. A total of 267 samples were collected from July to December 2016 in the dynamic and shallow southern coastal water of Korea. The variations in BCC mostly depended on planktonic size fraction. Network analysis revealed water depth-dependent co-occurrence patterns of coastal bacterial communities. Higher interspecies connectivity was observed within FL bacteria than NP/MP bacteria, suggesting that FL bacteria with a streamlined genome may need other bacterial metabolites for survival, while the NP/MP copiotrophs may have the self-supporting capacity to produce the vital nutrients. The analysis of topological roles of individual OTUs in the network revealed that several groups of metabolically versatile bacteria (the marine Roseobacters, Flavobacteriales , Desulfobacterales , and SAR406 clade) acted as module hubs in different water depth. In conclusion, interspecies interactions dominated in FL bacteria, compared to NP and MP bacteria; modular structures of bacterial communities and keystone species strongly depended on the water depth-derived environmental factors. Furthermore, the multifunctional, versatile FL bacteria could play pivotal roles in dynamic shallow coastal ecosystems.

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Section: Introductionmentioning

confidence: 99%

The water depth-dependent co-occurrence patterns of marine bacteria in shallow and dynamic Southern Coast, Korea

Cui

Chun

Baek

et al. 2019

Sci Rep

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“…As previously mentioned, currents move organic matter originating from aquaculture fish farms to adjacent waters [71]. The fish farms in Tongyeong are employed in coastal waters with fast currents due to the efficient removal of the excessive organic matter [33]. As currents relocated organic matter, dinoflagellate cysts in the surface sediments were also transferred in the direction of the current movement; therefore, cysts accumulated at the outer stations, resulting in higher cyst abundance.…”

Section: Relationship Between Sediment Environments and Dinoflagellate Cyst Assemblages In Eutrophic Sedimentsmentioning

confidence: 99%

“…Typically, 40% of organic matter that flux into coastal sediments is degraded at the benthic boundary layer and 60% is buried in the aquaculture farm sediments [29]. Previous studies showed that a variety of organic matter from the aquaculture farms impacts the sediment and water column environments [30][31][32][33]. Therefore, to investigate the coastal region in which eutrophication driven by organic matter from aquaculture farms could cause algal blooms, the phytoplankton community in the water column and the dinoflagellate cyst community in modern sediments should be evaluated using environmental variables.…”

Section: Introductionmentioning

confidence: 99%

“…Studies on characterizing organic matter-driven pollution such as chemical fluxes of sediment boundary layers in fish farms [29] and the spatial and temporal distribution of nitrogen compounds [33] have been intensively performed, whereas the distribution of dinoflagellate cysts was only investigated once by Pospelova and Kim [34], who assessed the correlation of dinoflagellate cyst distribution with sediment environmental conditions. However, their study was confined to dinoflagellate cyst assemblages.…”

Section: Introductionmentioning

confidence: 99%

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Eutrophication Driven by Aquaculture Fish Farms Controls Phytoplankton and Dinoflagellate Cyst Abundance in the Southern Coastal Waters of Korea

Kang

Kim

Moon

2021

JMSE

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We examined the dynamics of dinoflagellate cyst and phytoplankton assemblages in eutrophic coastal waters of Korea, adjacent to fish and shellfish farms. Water temperature showed seasonality, whereas salinity and pH remained relatively consistent. Dissolved inorganic nutrient levels were higher in September and at the inner stations, where aquaculture fish farms are located than those in May and at the outer stations. Canonical correspondence analysis and artificial neural network analysis revealed multiple environmental factors that affect the distribution of phytoplankton and dinoflagellate cysts. Diatoms dominated in the phytoplankton assemblages, while the protoperidinioid group dominated in the dinoflagellate cyst assemblages. Cyst abundance was higher at the outer stations than at the inner stations due to transport by fast currents, and phytoplankton abundance was positively correlated with cyst abundance. An increase in diatom abundance led to an increase in heterotrophic/mixotrophic cyst abundance, indicating that excessive uneaten food and urinary waste from the fish farms caused eutrophication in the study region and fast growth of diatoms, thereby contributing to the growth of heterotrophic/mixotrophic dinoflagellates and consequently, high abundance of heterotrophic/mixotrophic dinoflagellate cysts.

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“…The vast majority of red sea bream is produced in the coastal areas of Republic of Korea. Because red sea bream is cultured via the enclosure aquaculture method, it is directly exposed to the effects of natural environmental changes such as red tide occurrence and temperature change, unlike land-based culture, which involves cultivation inside the facility [12].…”

Section: Introductionmentioning

confidence: 99%

Oxidative Stress and DNA Damage in Pagrus major by the Dinoflagellate Karenia mikimotoi

Shin,

Seo,

Eom

et al. 2023

Toxins

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Karenia mikimotoi is a common species of red tide dinoflagellate that causes the mass mortality of marine fauna in coastal waters of Republic of Korea. Despite continuous studies on the ecophysiology and toxicity of K. mikimotoi, the underlying molecular mechanisms remain poorly understood. Red sea bream, Pagrus major, is a high-value aquaculture fish species, and the coastal aquaculture industry of red sea bream has been increasingly affected by red tides. To investigate the potential oxidative effects of K. mikimotoi on P. major and the molecular mechanisms involved, we exposed the fish to varying concentrations of K. mikimotoi and evaluated its toxicity. Our results showed that exposure to K. mikimotoi led to an accumulation of reactive oxygen species (ROS) and oxidative DNA damage in the gill tissue of P. major. Furthermore, we found that K. mikimotoi induced the activation of antioxidant enzymes, such as superoxide dismutase, catalase, glutathione peroxidase, and glutathione reductase, in the gill tissue of P. major, with a significant increase in activity at concentrations above 5000 cells/mL. However, the activity of glutathione S-transferase did not significantly increase at the equivalent concentration. Our study confirms that oxidative stress and DNA damage is induced by acute exposure to K. mikimotoi, as it produces ROS and hypoxic conditions in P. major. In addition, it was confirmed that gill and blood samples can be used as biomarkers to detect the degree of oxidative stress in fish. These findings have important implications for the aquaculture of red sea bream, particularly in the face of red tide disasters.

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Marine Environmental Characteristics in the Coastal Area Surrounding Tongyeong Cage-Fish Farms

Cited by 6 publications

References 7 publications

The water depth-dependent co-occurrence patterns of marine bacteria in shallow and dynamic Southern Coast, Korea

The water depth-dependent co-occurrence patterns of marine bacteria in shallow and dynamic Southern Coast, Korea

Eutrophication Driven by Aquaculture Fish Farms Controls Phytoplankton and Dinoflagellate Cyst Abundance in the Southern Coastal Waters of Korea

Oxidative Stress and DNA Damage in Pagrus major by the Dinoflagellate Karenia mikimotoi

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