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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Fisheries and Aquatic Sciences
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Journal DOI :
The Korean Society of Fisheries and Aquatic Science
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Volume & Issues
Volume 49, Issue 5 - Oct 2016
Volume 49, Issue 4 - Aug 2016
Volume 49, Issue 3 - Jun 2016
Volume 49, Issue 2 - Apr 2016
Volume 49, Issue 1 - Feb 2016
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Changes in the Physiochemical Quality of Sailfin Sandfish Arctoscopus japonicus Sauces Fermented with Soybean Koji or Rice Koji during Storage at Room Temperature
Jun, Joon-Young ; Lim, Yeong-Seon ; Lee, Mi-Hyang ; Kim, Byoung-Mok ; Jeong, In-Hak ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 101~108
DOI : 10.5657/KFAS.2016.0101
We investigated changes in the physiochemical quality of sailfin sandfish sauces fermented with two kojis during long-term storage at room temperature. Four fish sauces, including a control, were prepared by salt-fermentation with soybean koji (S-koji) or rice koji (R-koji) after autolysis. During storage, for 12 months, the color and levels of amino acids, total volatile base nitrogen (T-VBN) and organic acids but not moisture, salt or total nitrogen levels or pH differed markedly according to fish sauce type. The total nitrogen level was highest in S-koji, but there was no difference in the rate of increase in amino acid levels among the four fish sauces during storage. The T-VBN, of autolysis and S-koji were significantly higher than those of the control and R-koji during the entire storage period (P<0.05). The initial organic acid level did not differ among the four fish sauces, whereas it was notably higher in R-koji than in the other sauces at the end of storage. Hunter L, a and b values decreased in all fish sauces with increasing storage time. In conclusion, soybean koji may enhance the levels of nitrogen compounds as well as T-VBN in fish sauce, while rice koji reduced the formation of excess T-VBN and increased organic acid levels during storage at room temperature.
Defecation of Norovirus from the Oyster Crassostrea gigas by Depuration Following Translocation of the Growing Area
Yu, Hongsik ; Park, Yong Su ; An, Sera ; Park, Kunbawui ; Shim, Kil Bo ; Song, Ki Cheol ; Lee, Tae Seek ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 109~115
DOI : 10.5657/KFAS.2016.0109
The efficacy of depuration following growing area translocation for the defecation of norovirus was evaluated under experimental conditions using oysters Crassostrea gigas previously subjected to bioaccumulation of this virus at a waste treatment plant discharge site. Three trials were assayed in an open experimental system with a commercial oyster farm located in a shellfish growing area approved by the Korean Shellfish Sanitation Program. Real-time reverse-transcription polymerase chain reaction (RT-PCR) was used to quantify viruses in the digestive glands of oysters. The final viral loads in oysters after 12 days remained under the detection limit (10 copies/g digestive gland) of the real-time RT-PCR. This reduction trend showed two-phase removal kinetics, with an initial slow reduction or slight increase in viruses during the first 2 days of depuration and subsequent stabilization with 0.12 to 2.64 log unit norovirus copies/g digestive gland per 2 days of depuration for the remaining time.
Virulence Factors and Antimicrobial Susceptibility of Vibrio parahaemolyticus Isolated from the Oyster Crassostrea gigas
Kim, Sukyung ; An, Sera ; Park, Bomi ; Oh, Eun-Gyoung ; Song, Ki Cheol ; Kim, Jung-Wan ; Yu, Hongsik ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 116~123
DOI : 10.5657/KFAS.2016.0116
This study investigated the prevalence of Vibrio parahaemolyticus in the oyster Crassostrea gigas, which is commonly consumed raw. The presence of virulence factors and the antimicrobial susceptibility of isolates were also investigated. The overall prevalence rate of V. parahaemolyticus in oysters was 37.5% (36/96) and the range of concentrations was 30-11,000 MPN/100 g. PCR-based assays indicated that 9.6% (11/115) of the isolates were positive for the thermostable direct hemolysin-related hemolysin gene (trh), while none of the isolates were positive for the thermostable direct hemolysin gene (tdh). The Multiple Antibiotics Resistance (MAR) index was measured for 16 common antimicrobial agents and 46.1% (53/115) of the isolates had a MAR index > 0.2. The MAR index ranged from 0.07 to 0.73. The highest MAR index was observed with strain s150608, isolated in June 2015, which exhibited resistance to 11 antimicrobial agents. Our results demonstrate that oysters are high-risk sources of V. parahaemolyticus, although no antimicrobial agent was being used to promote growth or to treat bacterial infections in the sampled oyster-growing areas.
Comparison of the Biological Activities of Electrodialysis-desalted Bioactive Compounds from the Halophyte Suaeda japonica
Park, Hyeon-Ho ; Ko, Seok-Chun ; Jung, Won-Kyo ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 124~130
DOI : 10.5657/KFAS.2016.0124
To effectively remove salts from Suaeda japonica, extracts, an electrodialysis system was developed. The biological activities of non-desalted (NDS) and desalted S. japonica (DS) extracts were compared. The DS extract exhibited superior polyphenolic (6.26%) and carbohydrate (28.56%) contents. The IC
values of the DS extract against DPPH radicals and hydrogen peroxide were 0.22 and 0.68 mg/mL, respectively, which was higher than that of the NDS extract. Neither the DS nor the NDS extract was cytotoxic in RAW 264.7 macrophages. Additionally, the DS extract had a higher NO inhibitory effect compared to the NDS extract in lipopolysaccharide (LPS)-activated RAW 264.7 macrophages. These data indicate that DS extracts have greater biological activity than do ND extracts, and application of the electrodialysis process may be useful in marine bioresource applications.
Memory-improving Effects of Fermented Sea Tangle Saccharina japonica in Normal Mice
Ryu, Jehkwang ; Jo, Young-Hong ; Chang, Seong-Jun ; Lee, Bae-Jin ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 131~136
DOI : 10.5657/KFAS.2016.0131
Marine organisms are sources of many bioactive compounds, such as essential fatty acids, essential amino acids, vitamins, and minerals, making them useful candidates for the production of safe bioactive substances. They also synthesize glutamic acid, which can be used to produce γ-aminobutyric acid (GABA), the major inhibitory neurotransmitter in the central nervous system (CNS), via fermentation with Lactobacillus brevis BJ-20. This study investigated the degree to which fermented sea tangle (FST) inhibits enzymes such as acetylcholine esterase (AChE) and prolyl endopeptidase (PEP) and affects memory of normal mice using the T-maze test. FST inhibited more than 90% of AChE at 1 mg/mL and 50% of PEP at 8 mg/mL. Oral FST (100 mg/kg) significantly improved performance of normal mice on the T-maze. Therefore, sea tangle fermented with L. brevis BJ20 effectively contributes to memory improvement and might be a useful functional food ingredient.
Screening and Purification of an Antimicrobial Peptide from the Gill of the Manila Clam Ruditapes philippinarum
Seo, Jung-Kil ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 137~145
DOI : 10.5657/KFAS.2016.0137
This study screened the biological activity of an acidified gill extract of the Manila clam Ruditapes philippinarum including antimicrobial, hemolytic, membrane permeabilization, and DNA-binding activity, and purified the antimicrobial material. The acidified gill extract showed potent antimicrobial activity against Bacillus subtilis and Escherichia coli without significant hemolytic activity, but showed no membrane permeabilization or DNA-binding ability. An antimicrobial material was purified from the acidified gill extract using C
reversed-phase and cation-exchange high-performance liquid chromatography (HPLC). Treatment of the purified material with trypsin completely abolished all of the antibacterial activity against Bacillus subtilis, suggesting that the purified material is a proteinaceous antibiotic. The molecular weight of the purified material was 2571.9 Da, but no primary structural information was obtained due to N-terminal blocking. A future study should confirm the primary structure. Our results suggest that the Manila clam gill contains proteinaceous antibiotics that have a role in first-line defense. This information could be used to better understand the Manila clam innate immune system.
Effect of Dietary Proteins without Vitamin Premix Supplementation on the Growth and Body Composition of Juvenile Black Rockfish Sebastes schlegeli
Lee, HaeYoung Moon ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 146~153
DOI : 10.5657/KFAS.2016.0146
A feeding experiment was conducted to determine the nutritional value of various dietary protein sources without a vitamin premix supplementation in juvenile black rockfish, Sebastes schlegeli. Diets containing similar quantities of lipid and carbohydrate with 50% crude protein from fish meal (FM)/soybean meal (SBM)/corn gluten meal (CGM), FM only, casein/gelatin, high FM/low casein and low FM/high casein were fed to rockfish along with a commercial rockfish diet. The diet containing only 65.6% FM and the commercial rockfish diet produced significantly greater weight gain (WG) and feed efficiency (FE) than all other semipurified diets (SPDs); the economical diet with 52.8% FM, 10% SBM and 5% CGM produced lower WG than the diet containing FM and commercial rockfish diet, but FE and survival were similar both diets. Intermediate responses were observed for rockfish fed the SPD containing 32.8% FM and 27.4% casein, while SPDs containing 10% FM and 41.8% casein and 38.5% casein and 10% gelatin yielded the lowest WG and FE. Some differences in tissue indices and body composition of rockfish were induced by the diets containing various protein sources and levels without the vitamin premix supplementation.
Growth of Larval Rockfish Sebastes schlegeli Fed Moina macrocopa
Jeong, U-Cheol ; Jin, Feng ; Choi, Jong- Kuk ; Lee, Jeong-Tae ; Choi, Byeong-Dae ; Kang, Seok-Joong ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 154~160
DOI : 10.5657/KFAS.2016.0154
Several our studies have focused recently on the mass production of the freshwater Cladoceran Moina macrocopa which can substitute Artemia nauplii for the culture of larval marin fish. A 6 weeks experiment was conducted to investigate the effects of enrichment on the fatty acid composition of Moina macrocopa through feeding Schizochytrium sp. containing highly unsaturated fatty acids and to study the impacts of n-3-HUFA enriched Moina on improving survival rate and fatty acid compostion of larval rockfish Sebastes schlegeli. After feeding for 6 weeks, the Moina-fed fry resulted in a higher survival rate of 99.2% compared to the Artemia-fed fry 12.8%. In addition, the Moina-fed fry had the fast growth rate 45.6mm compare to the Artemia-fed fry 25.7 mm at the end of the experiment. The Moina-fed fry showed significantly higher level of 16.47% DHA than their Artemia-fed fry counterparts of the level of 3.97% with respect to DHA. PL, the cell membrane components in living food organisms, constituted 63.8% of the Moina, which was significantly higher than in the 40.1% of the Artemia. The present study indicate that Moina macrocopa can be used as Artemia substitute and improving the survival rate rockfish larvae through enchriment Schizochytrium sp.
Effects of Fermented Fecal Solid Diets on Growth of the Sea Cucumber Apostichopus japonicus
Jin, Feng ; Choi, Jong- Kuk ; Jeong, U-Cheol ; Md, Anisuzzaman ; Ryu, Chung-Ho ; Choi, Byeong-Dae ; Kang, Seok-Joong ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 161~167
DOI : 10.5657/KFAS.2016.0161
The effects of fermented fecal solid diets on the growth of the sea cucumber Apostichopus japonicus was investigated in a recirculating aquaculture system (RAS) during a 90-day experiment at 16.5-17.5℃, 32±0.5 psu salinity, pH 7.9-8.2, and 5.2-7.1 mg/L dissolved oxygen. The aim was to determine the feasibility of RAS fecal solid waste as a renewable feed for A. japonicus. In this study, unfermented fecal solid (UF), fermented fecal solid (FF), and commercial feed (CF) diets were used. The results showed that the growth rate did not differ significantly (P>0.05) between A. japonicus fed FF and CF; however, the growth rates of A. japonicus fed FF and CF were ~50% higher than that of those fed UF. Thus, utilization of fecal solid by A. japonicus may overcome the problem regarding accumulation of RAS waste. Use of a fermentation process would improve utilization of fecal solid as a renewable food source for A. japonicus.
Effect of Fish Farm Fecal Solid Diets on the Growth and Energy Budget of Juvenile Sea Cucumber Apostichopus japonicus
Jin, Feng ; Jeong, U-Cheol ; Choi, Jong- Kuk ; Md, Anisuzzaman ; Kim, Kyoung-Duck ; Choi, Byeong-Dae ; Kang, Seok-Joong ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 168~175
DOI : 10.5657/KFAS.2016.0168
We conducted a 90-day feeding experiment to evaluate the growth and energy budget of the sea cucumber Apostichopus japonicus. Sea cucumbers with a mean initial wet body weight of 3.03±0.06 g were fed one of the following three diets: an eel fecal solid diet, rainbow trout fecal solid diet, or a commercial diet at a water temperature of 17±1℃ and salinity of 32±1 psu. The results suggested that the diets affected the final body weight, specific growth rate (SGR), food ingestion, feces production ratio, and hence the growth and energy budget of the sea cucumbers. Sea cucumbers fed the eel and rainbow trout fecal solid diets showed poorer energy absorption, assimilation, and growth than those fed the commercial diet. The sea cucumbers fed the commercial diet had a significantly higher SGR and proportion of energy used for growth than those fed the other two diets. Sea cucumbers fed the rainbow trout fecal solid diet showed a comparatively higher ingestion rate and feces production ratio than those fed the commercial diet. The eel and rainbow trout fecal solid diets, therefore, were not suitable for sea cucumbers in intensive cultivation. Our findings will facilitate further development of more appropriate diets for culture of sea cucumber.
Monitoring of VHS and RSIVD in Cultured Paralichthys olivaceus of Jeju in 2015
Park, Hyun Kyung ; Jun, Lyu Jin ; Kim, Seung Min ; Park, Myoung Ae ; Cho, Mi Young ; Hwang, Seong Don ; Park, Shin Hoo ; Jeong, Hyun Do ; Jeong, Joon Bum ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 176~183
DOI : 10.5657/KFAS.2016.0176
In this study, disease surveillance was performed to monitor the prevalence of viral haemorrhagic septicaemia virus (VHSV) and red seabream iridovirus (RSIV) in olive flounder, Paralichthys olivaceus in 2015. The fish samples were collected in March (60 farms), May (55 farms) and July (52 farms) from different farms in Jeju. Reverse transcription polymerase chain reaction (RT-PCR) (VHSV) or PCR (RSIV) results showed that VHSV detected in 2 farms, but RSIV has not been detected in any farms. The sequences of the nucleocapsid protein (N) and glycoprotein (G) gene of the 2 VHSV isolates were successfully sequenced. Phylogenetic analysis was included VHSV isolates reported here together with a representative VHSV isolates available in GenBank. Phylogenetic analysis indicated that most of Korea VHSV isolates were closely related to the Japan and China genotype IVa which is clearly distinct from the North American genotype IVb.
Physiological Changes in the Cichlid Fish Maylandia lombardoi according to Various Calcium Concentrations in Rearing Water
Moon, Hye-Na ; Yeo, In-Kyu ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 184~189
DOI : 10.5657/KFAS.2016.0184
We investigated physiological changes in the freshwater cichlid, fish Maylandia lombardoi in response to different calcium concentrations in rearing water. Four different calcium concentrations (0, 2, 4 and 8 mM) were prepared in rearing water by the addition of ionized calcium (CaO) to examine the effect of various calcium concentrations in rearing water on physiological changes in the cichlid fish, M. lombardoi. Total calcium concentrations in plasma and body increased in a calcium concentration-dependent manner and reached the maximum at 8-mM calcium concentration. Stress-related cortisol was significantly decreased in the 8-mM group compared to the control group (0 mM). Lysozyme activity also significantly decreased in the 8-mM group. These results suggest that CaO in rearing water increases calcium uptake in fish and affects the body by decreasing stress and improving immunity in fish.
Crossed Effects of Light and Temperature on the Growth and Maturation of Gametophytes in Costaria costata and Undaria pinnatifida
Na, Yeon Ju ; Jeon, Da Vine ; Han, Su Jin ; Maranguy, Cyr Abel Ogandaga ; An, Dae Sung ; Cha, Hyung Kee ; Lee, Jae Bong ; Yang, Jae Hyeong ; Lee, Hae Won ; Choi, Han Gil ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 190~197
DOI : 10.5657/KFAS.2016.0190
We examined for differences in the growth and fertility of microscopic stages between Costaria costata and Undaria pinnatifida in crossed temperature×irradiance (12, 17, 22℃×20, 60 μmol photons m
) and daylength×irradiance (8, 12, 16, 24 h×20, 60 μmol photons m
) experimental designs. After 13 days in culture, maximum gametophyte growths of the two species were obtained under the following combinations of factors: 17℃×60 μmol photons m
and 24 h daylength×60 μmol photons m
. C. costata gametophytes produced sporophytes about 6 days earlier than those of U. pinnatifida. Sporophyte densities were highest in the 12 h daylength×60 μmol photons m
combination after 20 days in C. costata (9.7 plants mm
) and 26 days in U. pinnatifida (9.1 plants mm
). However, optimal growth conditions for the microscopic sporophytes differed between species: 17℃×60 μmol photons m
for C. costata, 12℃×60 μmol photons m
for U. pinnatifida. Thus, C. costata gametophytes grew faster and produced sporophytes earlier than those of U. pinnatifida, even though the haploid gametophytes of the two species responded similarly to environmental conditions. Optimal growth temperatures for the microscopic sporophytes also differed between species.
Population Structure of Liparis tanakae (PISCES, Liparidae) from Korea Based on Morphological and Molecular Traits
Myoung, Se Hun ; Ban, Tae-Woo ; Kim, Jin-Koo ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 198~207
DOI : 10.5657/KFAS.2016.0198
Tanaka’s snailfish, Liparis tanakae (Gilbert and Burke, 1912), is distributed throughout the coasts of Korea. To clarify the population structure of L. tanakae, we analyzed the morphological and genetic variation among individuals sampled from three localities surrounding the Korean peninsula: Boryeong in the Yellow Sea, Jinhae in the Korea Strait and Pohang in the East Sea. Principal component analysis based on 20 morphometric characteristics revealed two slightly distinct groups (Boryeong vs. Jinhae and Pohang). However, canonical discriminant analysis clearly revealed three groups, separated according to locality. Pairwise differentiation index (F
) comparisons based on 762-base pairs mitochondrial cytochrome b gene sequences showed that Boryeong significantly differed from Jinhae and Pohang, but Jinhae and Pohang did not significantly differ from each other. Our findings suggest that Korean L. tanakae comprise at least two groups. Further studies using more sensitive DNA markers, such as microsatellite DNA, are required.
Re-identification of Two Tonguefishes (Pleuronectiformes) from Korea using Morphological and Molecular Analyses
Kwun, Hyuck Joon ; Kim, Jin-Koo ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 208~213
DOI : 10.5657/KFAS.2016.0208
The re-identification of two Korean tonguefishes, Cynoglossus interruptus and Symphurus orientalis, was carried out using eight specimens collected from Korean waters in 2007 and 2013. C. interruptus is characterized by having a single row of scales between rows connected to the supraorbital line and the middle lateral line, 107–113 dorsal fin rays, 86–89 anal fin rays, and 53–55 vertebrae. S. orientalis is characterized by having a 1-2-2-2-2 ID pattern, 97–100 dorsal fin rays, 83–89 anal fin rays, and 52–55 vertebrae. Molecular analysis using mitochondrial DNA Cytochrome Oxidase subunit I sequences showed that specimens of the two species corresponded well to Japanese C. interruptus and Taiwanese S. orientalis, respectively. Therefore, although several reports have raised questions regarding the distribution of C. interruptus and S. orientalis in Korean waters, morphological and molecular data confirm that these two species are indeed distributed in these waters.
Time-Frequency Feature Extraction of Broadband Echo Signals from Individual Live Fish for Species Identification
Lee, Dae-Jae ; Kang, Hee-Young ; Pak, Yong-Ye ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 214~223
DOI : 10.5657/KFAS.2016.0214
Joint time-frequency images of the broadband acoustic echoes of six fish species were obtained using the smoothed pseudo-Wigner-Ville distribution (SPWVD). The acoustic features were extracted by changing the sliced window widths and dividing the time window by a 0.02-ms interval and the frequency window by a 20-kHz bandwidth. The 22 spectrum amplitudes obtained in the time and frequency domains of the SPWVD images were fed as input parameters into an artificial neural network (ANN) to verify the effectiveness for species-dependent features related to fish species identification. The results showed that the time-frequency approach improves the extraction of species-specific features for species identification from broadband echoes, compare with time-only or frequency-only features. The ANN classifier based on these acoustic feature components was correct in approximately 74.5% of the test cases. In the future, the identification rate will be improved using time-frequency images with reduced dimensions of the broadband acoustic echoes as input for the ANN classifier.
Acoustic Identification of Six Fish Species using an Artificial Neural Network
Lee, Dae-Jae ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 224~233
DOI : 10.5657/KFAS.2016.0224
The objective of this study was to develop an artificial neural network (ANN) model for the acoustic identification of commercially important fish species in Korea. A broadband echo acquisition and processing system operating over the frequency range of 85-225 kHz was used to collect and process species-specific, time-frequency feature images from six fish species: black rockfish Sebastes schlegeli, black scraper Thamnaconus modesutus [K], chub mackerel Scomber japonicus, goldeye rockfish Sebastes thompsoni, konoshiro gizzard shad Konosirus punctatus and large yellow croaker Larimichthys crocea. An ANN classifier was developed to identify fish species acoustically on the basis of only 100 dimension time-frequency features extracted by the principal components analysis (PCA). The overall mean identification rate for the six fish species was 88.5%, with individual identification rates of 76.6% for black rockfish, 82.8% for black scraper, 93.8% for chub mackerel, 90.6% for goldeye rockfish, 96.9% for konoshiro gizzard shad and 90.6% for large yellow croaker, respectively. These results demonstrate that individual live fish in well-controlled environments can be identified accurately by the proposed ANN model.
Effect of Typhoons on Contaminants Released from the Southern Sea around Fukushima of Japan
Hong, Chul-Hoon ; Kim, Jinpyo ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 234~240
DOI : 10.5657/KFAS.2016.0234
We examined the diffusion of contaminants released from the southern coast around Fukushima, Japan, during the passage of typhoons using a three-dimensional numerical model (POM) to track diffusing radioactivity (RA) released from the nuclear power plant at Fukushima following the accident caused by the giant tsunami event in March 2011. Radioactive contaminants released during the passage of typhoons may have significantly affected not only Japanese but also Korean coastal waters. The model domain covered most of the northwestern Pacific including marginal seas such as the East/Japan Sea and the Yellow Sea. Several numerical experiments were conducted case studies focusing on the westward diffusion from the southern coast of Japan of contaminants derived from the source site (Fukushima) according to various attributes of the typhoons, such as intensity, track, etc. The model produced the following results 1) significant amounts of contaminants were transported in a westward direction by easterly winds favorable for generating a coastal air stream along the southern Japanese coast, 2) the contaminants reached as far as Osaka Bay with the passage of typhoons, forced by a 5-day positive sinusoidal form with a (right-) northward track east of Fukushima, and 3) the range of contamination was significant, extending to the interior of the East/Japan Sea around the Tsugaru Strait. The model suggests that contaminants and/or radioactivity released from Fukushima with the passage of typhoons can affect Korean waters including the northeastern East/Japan Sea around the Tsugaru Strait, especially when the typhoon tracks are favorable for generating a westward coastal air stream along the southern Japanese coast.
Bloom of a Filamentous Green Alga Cladophora vadorum (Areschoug) Kützing and Nutrient Levels at Shangrok Beach, Buan, Korea
Ha, Dong Soo ; Yoo, Hyun Il ; Chang, Soo Jung ; Hwang, Eun Kyoung ;
Korean Journal of Fisheries and Aquatic Sciences, volume 49, issue 2, 2016, Pages 241~246
DOI : 10.5657/KFAS.2016.0241
A filamentous green alga Cladophora vadorum (Areschoug) Kützing, bloomed at Shangrok Beach, Buan, Republic of Korea, in September 2015. This alga is currently distributed worldwide. Concentrations of total nitrogen (TN), total phosphorus (TP), dissolved inorganic nitrogen (DIN), and dissolved inorganic phosphorus (DIP) were analyzed in the bloom area and compared to those of other areas in the vicinity. DIN and DIP concentrations were similar to those of other areas. However, TN and TP were as much as six and ten times higher than in other areas, respectively. As in other Cladophora species, the bloom of C. vadorum at Shangrok Beach in 2015 appears to have depended on the TP concentration in the seawater. This suggests that blooms in the area can be controlled by reducing TP.