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Oh D.-J.,Jeju Biodiversity Research Institute | Oh B.-S.,South Sea Fisheries Research Institute | Jung M.-M.,Jeju Fisheries Research Institute | Jung Y.-H.,Jeju Biodiversity Research Institute
Mitochondrial DNA | Year: 2010

We cloned and sequenced the complete mitochondrial DNA (mtDNA) of three tilefishes (Branchiostegus albus, Branchiostegus argentatus, and Branchiostegus japonicus) to characterize and compare their mitochondrial genomes (mitogenomes). The mitogenomes of B. albus, B. argentatus, and B. japonicus were 16,532, 16,550, and 16,541 bp long, respectively, and all consisted of 37 genes (13 protein-coding genes, 2 ribosomal RNA, and 22 transfer RNA (tRNAs)), which are typical for vertebrate mtDNA. As in other bony fishes, most genes were encoded on the H-strand, except for the nad6 and eight tRNA genes that were encoded on the L-strand. Among the 13 protein-coding genes of all three tilefishes, 2 reading-frame overlaps were found on the same strand: atp8 and atp6 overlapped by 10 nucleotides, and nad4L and nad4 overlapped by 7 nucleotides. The identity of the nad4 gene between B. albus and B. argentatus was the lowest at 87%. Conversely, the identity of the nad6 gene between B. albus and B. japonicus was the highest at 99%. Most tRNA genes were similar in length among the three species, while the tRNA-Ser(AGY) of B. japonicus was 9 bp longer than those of B. albus and B. argentatus. The control region of the mitogenome spanned 853, 862, and 856 bp in B. albus, B. argentatus, and B. japonicus, respectively. A maximum likelihood tree constructed using 11,035 sites contained five independent groups with bootstrap values of 100% in support of their divergence. All three tilefishes examined were clustered with the Pomacanthidae species in Group II. © 2010 Informa UK, Ltd. Source

Choi H.G.,South Korean National Fisheries Research and Development Institute | Moon H.B.,South Korean National Fisheries Research and Development Institute | Choi M.,South Korean National Fisheries Research and Development Institute | Yu J.,South Korean National Fisheries Research and Development Institute | Kim S.S.,South Sea Fisheries Research Institute
Environmental Monitoring and Assessment | Year: 2010

The level and extent of organic contaminants along the Korean coast were estimated through the mussel watch program, established in 2001. Mussels and oysters were collected at 20 sites along the Korean coast in 2001 and at 25 sites from 2002 to 2007. The mussel tissues were analyzed for PCBs, organochlorine presticides, PAHs, BTs, and PCDD/Fs. PCBs, PAHs, BTs, and PCDD/Fs were ubiquitous contaminants along the Korean coast, showing mean detection frequencies of more than 95% over 7 years. The concentrations of organic contaminants in mussels along the Korean coast were relatively low or moderate compared with foreign studies. Concentrations of DDTs, PCBs, and PCDD/Fs were below the action or maximum levels for humans established by USFDA and EU. Elevated concentrations above the 85th percentile were found for PCBs, PAHs, BTs, and PCDD/Fs at sites near industrial complexes or big harbors, for HCHs at sites near non-industrial complexes, and for DDTs at sites near both non-industrial and industrial complexes. Using two nonparametric tests to assess temporal trends, the Spearman test revealed that BTs and PCDD/Fs had significant decreasing trends at four sites (Gwangyang Bay, Cheonsu Bay, Garorym Bay, and the Incheon coast) and at six sites (Hupo coast, Guryongpo coast, eastern part of Geojedo, Gunsan coast, Garorym Bay, and Asan Bay), respectively. © 2009 Springer Science+Business Media B.V. Source

Lee Y.G.,Chonnam National University | Jeong D.U.,Chonnam National University | Lee J.S.,Chonnam National University | Choi Y.H.,South Sea Fisheries Research Institute | Lee M.O.,Chonnam National University
Marine Pollution Bulletin | Year: 2016

Seawater monitoring and geochemical and benthic foraminiferal analysis of sediments were conducted to identify the effects of hypoxia created by a mussel farm on benthic foraminifera in a semi-closed bay. Extremely polluted reductive conditions with a high content of organic matter (OM) at >12.0% and oxygen minimum zones (OMZs) with dissolved oxygen (DO) <0.4mg(ring operator)L-1 were formed below the mussel farm in the northwest area of Gamak Bay, and gradually diffused toward the south. Highly similar patterns of variation were observed in species diversity, abundance frequency, and benthic foraminiferal assemblage distributed from Elphidium subarcticum-Ammonia beccarii in the northwest area through E. subarcticum-A. beccarii-Trochammina hadai, E. subarcticum-A. beccarii-Elphidium clavatum, and E. clavatum-Ammonia ketienziensis in the southern area. These phenomena were caused by hydrodynamics in the current water mass. It was thought that E. subarcticum is a bioindicator of organic pollution caused by the mussel farm. © 2016 Elsevier Ltd. Source

Lee Y.G.,Chonnam National University | Choi Y.H.,South Sea Fisheries Research Institute | Jeong D.U.,Chonnam National University | Lee J.S.,Chonnam National University | And 3 more authors.
Marine Pollution Bulletin | Year: 2016

Tidal current survey as well as geochemical and benthic foraminiferal analyses of sediment cores were conducted in an abalone farm and a Zostera bed to understand the degree to which the abalone farm facilities installed along a channel in a shallow sea affect the benthic environment and ecology. In the abalone farm, Ammonia beccarii-Pseudoparrella naraensis-Elphidium somaense-Rosalina globularis-Trochammina hadai and P. naraensis-E. somaense-A. beccarii-T. hadai assemblages appeared owing to an increase in the total nitrogen content from the biodeposits. The Zostera bed consisted of A. beccarii-P. naraensis-Buccella frigida-T. hadai assemblage owing to the gradual expansion of a brackish shallow-water environment by the rapidly decreasing current speed, and it may have flourished. Moreover, the total sulfur, Zn, Cr, and Cu contents in the sediments decreased remarkably more than those of the pre-abalone farming did, caused by the vigorous activity of Zostera marina physiology. © 2016. Source

Hwang H.K.,South Sea Fisheries Research Institute | Park K.I.,Kunsan National University | Park S.W.,Kunsan National University | Choi M.S.,Kunsan National University | And 3 more authors.
Bulletin of the European Association of Fish Pathologists | Year: 2012

The red sea bream Pagrus major is a commercially important aquaculture fish species that inhabits the southern coasts of Korea and Japan. During the last decade, abnormally low winter temperatures have been recorded along the south coast of Korea, resulting in the mass mortality of P. major in cage culture farms. Therefore, to determine the effect of low temperatures on the physiology of P. major, changes in the serum biochemical parameters of red sea bream exposed to low temperature shock were investigated. Juvenile P. major were reared in water at temperatures of 7°C, 10°C, or 13°C, and concentrations of serum protein, glucose, aspartate aminotransferase (AST), sodium (Na), chloride (CI), potassium (K), and Cortisol, were measured for 15 days. Serum glucose, AST, and Cortisol concentrations were significantly higher at cold temperatures, whereas serum protein and K concentrations were reduced. In particular, significant differences in the serum concentrations of protein, glucose, and Cortisol were observed in response to cold water shock, suggesting that these parameters are clinically relevant for assessing the effects of cold water shock in P. major. Furthermore, new cage culture management techniques for fish species are needed in the southern waters of Korea during winter to avoid mass mortality. Source

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