• Ocean Science Journal
• /
• v.42 no.1
• /
• pp.31-39
• /
• 2007

Distributional characteristics of dinoflagellate cysts in surface sediments were investigated in relation to environmental factors in the eastern part of Geoje Island, Korea. Samples were collected from 10 stations in February of 2004 and water temperature and salinity were measured in February, May, September and November of 2004. Total 30 taxa of dinoflagellate cysts were identified representing 19 genera, 28 species and 2 unidentified species. Among these dinoflagellate cysts, Brigantedinium spp. of which relative proportion in th e total dinoflagellate cysts was 23.5%, was the most abundant at all stations except St. 1, and was followed by Spiniferites bulloideus (8.6%), Lingulodinium machaerophorum (8.2%) and Diplopsalis lenticula (6.7%). In addition, ellipsoidal cysts of the genus Alexandrium (Alexandrium catenella - tamarense type) and Gymnodinium catenatum, known to be causative organisms for PSP, occurred with high concentrations. Scrippsiella trochoidea was also found; however, its cyst concentration was low. Generally, species composition in the study area was similar to these reported from Jinhae Bay and Busan Harbor and several dinoflagellate cysts reflected the eutrophic condition. Cyst distribution in th e eastern part of Geoje Island seems to be influenced by the Tsushima Warm Current flowing from the southwest. The mean water temperature was $12.0^{\circ}C$ in February, $14.7^{\circ}C$ in May, $20.9^{\circ}C$ in September and $17.2^{\circ}C$ in November, which was most favorable for Alexandrium spp. growth. The abundances of dinoflagellate cysts rang e d from 528 to 2,834 cysts/g dry sediment. Higher concentrations were recognized in sediments of west area of the Jisimdo than at other stations. The cyst composition of this area was closely related to these of Jinhae Bay and Busan Harbor from which currents flow into this area. Higher cyst concentration in the west area of Jisimdo might be due to formation of the gyre.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.15 no.1
• /
• pp.35-41
• /
• 1982

Phaeophytin, COD, ignition loss and sulfide contents in the superficial bottom muds in Jinhae Bay, one of the most productive bays in the southern coastal waters of Korea, were measured in the summer season 1981 to investigate the eutrophication level and the origin of pollutants, Phaeophytin contents were $7.6-48.2{\mu}g/g$, COD 9.7-38.5 mg/g, ignition loss $8.1-14.2\%$ and sulfide 0.05-1.07 mg/g. Horizontal distributions in quantities of aforementioned four parameters were almost sane patterns; that is, the further from the mouth of the bay, the more quantities were found. The worst area was the western part of Gajo-do, where density of shellfish farms was the highest in the whole bay. COD and sulfide contents in the western part of Gajo-do were much more than maximum level of the eutrophicated zone, say 30 mg/g in COD and 0.2 mg/g in sulfide. Such great quantities of organic matters and sulfide in the innermost part of the bay would be mainly due to excrements from shellfishes and fouling organisms, but not owing to the influence of pollutants discharged from Masan, Jinhae harbour and its vicinity.

• Journal of Environmental Science International
• /
• v.7 no.1
• /
• pp.8-19
• /
• 1998

The dicriminant function was introduced to understand the cause and establish the prediction method of red tides occurring In Jinhae Bay. Korea. Two sea re91ons of Masan and Haengam Bays and Dang- dong and Wonmun Bays had different types of causes and patterns for red tides. In Masan and Haengam Bays, the red tides concentrically occurred during June and September. For example, in .lune the red tides occurred from physical and meteorological factors, which are related to the stratification and the increase in planktons. However in August the red tides occurred from the water quality environment, based on these conditoins. Futhermore, in September the red tides were caused by the balance between the meteorological and water quality environmental factors. In contrast to those, In Dangdong and Won-mun Bays, the red tides mainly occurred during July and October and the frequency of occurrence was not as much as Masan and Haengam Bays. Especially, in August and September most meteorological and physical factors or water quality environmental factors appeared to contribute to the occurrence of red tides. This indicates that red tides do not easily occur as they are controlled by various environmental factors particularly in these regions The discriminant functions were applied to predict red tides which they were actually occurred In Masan and Haengam Bays in June. The results showed that they were successful for the prediction of red tide at Haengam Bay but not at Masan Bay. The reason for their discrepancy in Masan Bay could have come from using a slight higher value of pH or COD in May, instead of its value in June.

• Journal of Environmental Science International
• /
• v.16 no.8
• /
• pp.959-971
• /
• 2007

The three-dimensional eco-hydrodynamic model was applied to estimate the autochthonous COD caused by production of phytoplankton in Jinhae Bay. A residual current was simulated, using a hydrodynamic model, to have a sightly complicated pattern in the inner part of the bay, ranging from 0.001 to 5 cm/s. In the outer part of the bay, the simulated current flowed out to the south sea with a southward flow at a maximum of 25 cm/s. The results of the ecological model simulation of COD levels showed high concentrations, exceeding 4 mg/L, in the inner bay of Masan, an area of wastewater discharge, and lower levels, approaching less than 1 mg/L, closer to the outer part of the bay. The simulation results of Autochthonous COD by two methods using ecological modeling, showed high ratio over 70% of total COD. Therefore, it is more important to consider nutrients than organic matters in the region for control COD standard.

• Ocean and Polar Research
• /
• v.33 no.3
• /
• pp.235-253
• /
• 2011

The annual variation of mesozooplankton community in the Jangmok harbor of Jinhae Bay was studied in relation to environmental variables. Sampling was carried out weekly from January to December 2009. During the study periods, mesozooplankton community consisted of 44 taxa and the annual mean abundance was 8308 inds. $m^{-3}$. The maximum abundance was observed to be 50043 inds. $m^{-3}$ in August and the minimum in April with 1013 inds. $m^{-3}$. Of these, Penilia avirostris, cirripedia larvae, Evadne tergestina, Acartia omorii, Oikopleura s, Paracalanus parvus s. l., Eurytemora pacifica, Podon s, Oithona s, and Acartia steueri were observed as dominant species in Jangmok bay and they also contributed to 79% of total mesozooplankton. According to non-metric multidimensional scaling (nMDS) and cluster analysis based on the mesozooplankton community data from each season, the community was divided into three groups. The first group included appearence species in winter and spring season, which is mainly dominated the copepod such as A. omorii and E. pacifica. The second and third group was composed with observed species in summer and autumn, respectively. Based on the SIMPER (similarity percentages), P. avirostris in summer and cirripedia larvae in autumn were significantly dominated. Our results indicate that although the mesozooplankton abundances in Jangmok harbor fluctuated abruptly, its annual variation was strongly influenced by water temperature.

• Korean Journal of Ichthyology
• /
• v.23 no.1
• /
• pp.37-45
• /
• 2011

Seasonal variation in species composition and abundance of fish larvae assemblages in the south-western Jinhae Bay were investigated monthly in 2009. During the study period, 49 larvae species belonging to 24 families were collected. The dominant species were Clupea pallasii, Hexagrammos otakii, Konosirus punctatus, Engraulis japonicus, Parablennius yatabei, and Omobranchus elegansei. These six species accounted for 92.7% of the total number of individuals collected. The number of species, number of individuals, and species diversity indices fluctuated with the seasons. The peak number of species and individuals occurred in July and January, respectively. Principal component analysis(PCA) and correlation analysis showed that variation in monthly water temperature could act as an indicator of seasonal variation in community structure and abundance of the dominant species; in particular, those of C. pallasii, H. otakii, E. japonicus and P. yatabei corresponded with the water temperature.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.15 no.2
• /
• pp.99-104
• /
• 2009

The species composition and seasonal patterns in marine benthic algal community at intertidal zone in Jinhae Bay were investigated seasonally throughout 2007. A total of 45 species, 6 Chlorophyta, 10 Phaeophyta, and 29 Rhodophyta, were recorded, and dominant species were Ulva pertusa, U. conglobata, Sargassum horneri, Gelidium divaricatum, Gracilaria textorii, and Polysiphonia morrowii during study periods. The number of species were differed with seasons and stations; Higher number of algal species was 42 species in winter, whereas 33 species was lower in summer. The number of algal species were higher at station 1,7,8, while the lower value was at station 2, 3 than other stations. The differences of marine benthic algal composition at each station in MDS ordination due to the physical characteristics and local topography.

• Korean Journal of Ichthyology
• /
• v.12 no.4
• /
• pp.244-249
• /
• 2000

This study was conducted to obtain data for identification of species among elvers of anguillids, Anguilla japonica and A. anguilla and A. rostrata implanted in Korea for culture. The longer predorsal length and the fewer number of vertebrae distinguished elvers of A. rostracta from those of A. anguilla and A. japonica. A. japonica and A. anguilla were well discriminated each other in the statistical value of preanal length which the former showed shorter distance. It was remarked phylogenetically that the morphological changes according to growth in head and predorsal length of A. rostrata was different from other two species. So the elvers of A. japonica, A. anguilla and A. rostrata culturing in Korea can be distinguished by the vertebral counts, predorsal and preanal length.

• Korean Journal of Environmental Biology
• /
• v.26 no.3
• /
• pp.214-219
• /
• 2008

Changes in stress-associated biomolecules can be used as an important criterion for assessing the levels of environmental pollution because living organisms demonstrate contamination-stimulated stress responses. This study was conducted to determine the environmental status of Masan-Jinhae Bay, Korea, and its effects on marine organisms by investigating the endoplasmic reticulum (ER) dysfunction in the organs of the flat fish, Limanda yokohamae. ER dysfunction was evaluated via Western blot analysis of the ER stress proteins, immunoglobulin heavy chain binding protein (BiP) and C/EBP-homologous protein (CHOP), and the ER stress-associated protein caspase-12. The results showed that the amount of BiP and CHOP immunoreactivity in the flat fish from the bay area was much greater than that from the Gangneung, as a reference site. Similar to the ER stress proteins, the immunoreactivity of caspase-12 was also found to be elevated in the bay area when compared with that of Gangneung. These data suggest that the environmental status of Masan-Jinhae Bay induces the ER stress response, which is able to lead to phenotypic changes in marine organisms including fish.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.49 no.3
• /
• pp.270-281
• /
• 2013

Hydro-acoustic surveys with scientific echo sounder were carried out to estimate the total density and distribution of the juvenile cod in Jinhae bay, Korea. The surveys were conducted 4 times from May to June using 2 frequency method (38kHz and 120kHz) and beam trawl were used to investigate the species composition. Also the catch amounts of juvenile cod were compared with the cod density estimated by the hydro-acoustic method. It was confirmed that the juvenile cod was stayed in Jinhae bay in early June and There was the relationship between catch of juvenile cod and the estimated density by hydro-acoustic survey. The number of juvenile cod was consequently about 365,000 fish (CV 12.9%) in May and 113,000 fish (CV 9.2%) in May based on the hydro-acoustic data.