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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Fisheries and Aquatic Sciences
Journal Basic Information
Journal DOI :
The Korean Society of Fisheries and Aquatic Science
Editor in Chief :
Volume & Issues
Volume 24, Issue 6 - Nov 1991
Volume 24, Issue 5 - Sep 1991
Volume 24, Issue 4 - Jul 1991
Volume 24, Issue 3 - May 1991
Volume 24, Issue 2 - Mar 1991
Volume 24, Issue 1 - Jan 1991
Selecting the target year
Population Dynamics of Mabled sole Limanda yokohamae(
) in Tokyo Bay, Japan
PARK Jong-Soo ; SIMIZU Mako-to ;
Korean Journal of Fisheries and Aquatic Sciences, volume 24, issue 1, 1991, Pages 1~8
Population dynamics of Matted sole Limanda yokohamae(
) in Tokyo bay, Japan has been studied by virtual population analysis (VPA) for multi cohort and experimental fishing. Based on the biological data, the present parameters of the Limanda yekohamae stock at the Tokyo bay, Japan were estimated as follows: natural mortality coefficient(M) were 0.313 for male and 0.250 for female, terminal fishing mortality coefficient(F) were 2.190 for male, and 0.798 for female, rate of exploitation(E) was
. From the result of virtual population analysis for multi cohort, the population size were estimated from 3,5000,000 to 9,200,000 fishes, according to the result of experimental fishing, estimated stock size were 2,400,000 to 8,700,000 fishes. Stock size difference of the two methods were about two times in 1987, however, other years has been showed from 0.8 to 1.5 times. Both method has been showed same increase and decrease tendency of the c. p. u. e. and catches. From the isopleth diagram plot by Beverton and Holt's yield per recruit, the catches could be increase two times for female, 1.3 times for male than present aspects by the fishing management. And further, as reducing fishing effort, extension of mesh size and rising the length at first caputre, are reasonable in order to manage the stock at the optimum level.
Effect of the Tidal Sea Level Change on the Unconsolidated Sediment in Gwangyang Bay
CHO Tae-Chin ;
Korean Journal of Fisheries and Aquatic Sciences, volume 24, issue 1, 1991, Pages 9~20
The characteristics of the unconsolidated sediment in Gwangyang bay was analyzed from the core samples. The porosity of the sediment showed irregular variation with respect to the sedimentation depth, which indicated that sediment weight-induced consolidation was not significant. Numerical analysis for the mechanical and hydraulic behavior of the unconsolidated sediment due to the tidal sea level change was processed. Because of the delayed excessive pore pressure change in the very low permeable mud medium, the magnitude of the excessive pore pressure for the duration of the minimum sea level exceeded the total stress from the sea water weight, which resulted in the negative (tensional) effective stress below the top surface. The in-situ effective stress, obtained by superposing the tensional effective stress on the solid weight-induced compressive stress, was remained to be tensile (quick-sand condition) near the top surface of the mud deposit. The occurrence of the quirk-sand condition provided a theoretical evidence for the insignificant consolidation and the irregular porosity variation of the sediment. When the sand is distributed on the top surface of the mud layer, the quick-sand condition occurred below the sandy mud layer and the downward movement of sand particles was facilitated.
Self-purification Capacity of Eutrophic Buk Bay by DO mass Balance
CHOI Woo-Jeung ; NA Gui-Hwan ; CHUN Young-Yell ; PARK Chung-Kil ;
Korean Journal of Fisheries and Aquatic Sciences, volume 24, issue 1, 1991, Pages 21~30
In Summer, oxygen-deficient water masses were developed extensively in the closed eutrophic bays such as Chinhae Bay which results in mass mortality of marine organisms and severe decrease the production of the bay every year. Under the circumstances, this study was performed to investigate the oxygen depletion relating to eutrophication, and also to evaluate self-purfication capacity of Buk Bay by dissolved oxygen mass balance in 1988. The mean concentration of total inorganic nitrogen, phosphate phosphorus and chlorophyll-a were
respectively, which were over eutrophication criteria. Oxygen-deficient water mass was formed in July with the minimum concentration of 2.08ml/l(mean) at the bottom of all stations and recovered slowly in August. The decay and reaeration coefficient calculated from dissloved oxygen sag curve were 0.222/day and 0.018ml/l/day, respectively. To maintain above 4ml/l of oxygen to prevent oxygen-deficient water mass, it is recommendable to supply as much as 0.856ml/l/day of dissolved oxygen or should be reduced the same mass loading of BOD from watershed by the construction of wastewater treatment plant.
Suspended Sediment Budget in Gwangyang Bay through the Yeosu Sound
KIM Dae-Choul ; KANG Hyo-Jin ;
Korean Journal of Fisheries and Aquatic Sciences, volume 24, issue 1, 1991, Pages 31~38
Suspended sediment budget in Gwangyang Bay was investigated using the data of suspended sediment concentration and vertical distribution of tidal currents at the mouth of the bay in the Yeosu Sound (Yeosu Haeman) . At the mouth of the bay suspended sediment concentration shows much higher value of approximately 17.80mg/l on the average near the bottom than the concentration near the surface where the average is 4.7mg/l. Tidal currents also show an asymmetry in magnitude between flood and ebb. Near the surface ebb is stronger than flood, while flood is stronger than ebb near the bottom. Due to the higher concentration and stronger flood current near the bottom, transport of suspended sediment near the bottom plays a major role to the sediment budget in the bay, and the bay is in net-depositional environment. The western part of the bay seems to gain the suspended sediment of approximately
, which corresponds to a sedimentation rate of about 1.15m/1,000years.
Primary Production in the Osyter Farming Bay
LEE Byung-Don ; KANG Hyung-Ku ; KANG Yong-Joo ;
Korean Journal of Fisheries and Aquatic Sciences, volume 24, issue 1, 1991, Pages 39~51
The primary production of phytoplankton in oyster farming bays were seasonally measured by
method in Hansan-Koje Bay and Kamagyang Bay for one year period. In Hansan-Koje Bay, mean daily prima production was
, and it was relatively high in summer and low in winter. Annual primary production was estimated to be
. Mean chlorophyll a content was
, and it was relatively high in summer. In Kamagyang Bay, mean daily prima production was
. and it was maximum in summer and minimum in fall. Annual primary production was estimated to be
. Mean chlorophyll a concentration was
, and it was maximum in summer and relatively high in winter. Considering the water area of the two osyter farming bays, annual carbon production by phytoplankton were 9,450 ton in Hansan-Koje Bay and 37,000 ton in Kamagyang Bay. In general pattern of primary production in these bays, high production occurs in summer with increasing trend since spring.
The Effect of Dissolved Oxygen on the Estival Mass Mortality of sea squirt, Halocynthia roretzi(Drasche)
NA Gui-Hwan ; LEE Chae-Sung ; CHOI Woo-Jeung ;
Korean Journal of Fisheries and Aquatic Sciences, volume 24, issue 1, 1991, Pages 52~58
Mass mortality of Halocynthia roretzi has been occurred in culturing grounds of southern coast of Korea during the long period of summer drought and the unusal high water temperature in 1988. Especially Halocynthia roretzi was damaged severely in 2 years group. Therefore we verified these phenomena by observing the environmental factors of culturing grounds and by evaluating oxygen consumption rate in indoor experiment. In culturing grounds, the mortality rate was high in Namhae Mizo area where water temperature was the highest and the lowest in dissolved oxygen concentration as low as 3.76m/l in field observation. In indoor experiment, the higher the water temperature, the more mortality was occurred and the salinity above 30 had no effect on its mortality. In oxygen consumption rate experiment, the smaller needs more oxygen than larger one, i. e., oxygen demand per unit weight was higher in 2 years group than that of 3 years. The theoretical and the actual minimum oxygen demands(MOB) for preventing asphixation was 3.7ml/kg/h at
and 6.3ml/kg/h gat
, But actual MOD was 4.3ml/kg/h at
in indoor experiment. It seemed that mass mortality of Halocynthia roretzi in summer was caused by metabolism disorder due to insufficient oxygen level influenced by the high water temperature and the high density of Halocynthia roretzi, which results in the paucity of oxygen especially in 2 years groups.
Numerical Experiments on the Hydrodynamic and Diffusion in Estuary by using Two-level Model
KIM Cha-Kyum ; LEE Jong-Sup ;
Korean Journal of Fisheries and Aquatic Sciences, volume 24, issue 1, 1991, Pages 59~69
Two-level numerical models are formulated to predict the flow pattern, SS(suspended solids) distribution and the behavior of discharged fresh water in estuary, and are applied to the Suyoung River estuary in Pusan, Korea. To verify the application of the models, field observations of tidal current, salinity and 55 were performed during the period of spring tide. Computed upper level velocities by two-level model are in better agreement with observed values than single model. Apart from the magnitude of the velocities, the predicted flow fields at upper level are similar to those obtained at lower level. Upper level velocities in river channel during ebb spring tide are about 2 times stronger than those during flood spring tide due to the discharging flow rate from the Suyoung River. Two-level model results on the salinity and 55 distribution at upper level are compared with the observed ones at the surface. Computed salinity distributions are in good agreement with the observed values, but computed 55 distributions show
ppm higher values than the observed ones.
Mass Mortality of Arkshell, Anadara broughtonii SCHRENCK Seedlings with Marine Ecological Characteristics
CHUN Young-Yull ; NA Gui-Hwan ; CHOI Woo-Jeung ;
Korean Journal of Fisheries and Aquatic Sciences, volume 24, issue 1, 1991, Pages 70~78
Both long period of summer drought and unusual high water temperature in 1988 caused the harmfull effect to the aquacultural organisms in south coast of Korea. One of those was the mass mortality of arkshell seedlings in Jinhae Bay. The purpose of this study was to verify the effects of environmental factors on arkshell seedlings by investigating not only water quality and food organisms in culturing grounds, but also meteorological conditions. Water temperature in November was higher at
than mean water temperature and the concentration of total inorganic nitrogen and N/P ratio were
0.98, respectively which indicated the exhaustion of nutrients, especially nitrogen in the study area. In analysis of phytoplankton population structure, species diversity index(H) , equitability-index(e), species richness
were low, but dominance
was high at the value of 98.4 and dominant species was Nitzschia pungens. In conclusion, it seems that mass .mortality of arkshell seedlings in November was resulted from the metabolism disorder with poor food organism under the unstable marine environment.
A Study on the relationships between the epiphytic microbes and the blight of Porphyra species from the coastal waters of the Yellow Sea, Korea 1 . Species composition and standing stocks of epiphytic diatom and ambient water phytoplankton
KIM Joong-Rae ; SHIN Yoon-Keun ; LEE Geon-Hyoung ; LEE Won-Ho ;
Korean Journal of Fisheries and Aquatic Sciences, volume 24, issue 1, 1991, Pages 79~88
To study the distribution patterns of epiphytic diatom on Porphyra species and ambient water phytoplankton, samples were collected in the Gaeya Island, Kyukpo, and Mokpo of the Yellow Sea from February 1989 to March 1990. Foully species of epiphytic diatoms were observed. Of these, the dominant species of epiphytic diatoms are Limophora dalmatica, L. abbreviata, Melosira nummuloides, Paralia sulcata, Achnanthes javanica var, subconstricta, Grammatophora oceanica, Navicula sp., Synedra sp., Pinnularia sp., Fragilaria striatula, Cocconeis scutellum var. parva. Licmophora dalmatica predominated troughout the study period. Phytoplankton standing stocks were relatively larger than those of other coastal areas in the Yellow Sea, Korea. Distribution patterns of epiphytic diatoms and the ambient water phytoplankton in Gaeya Island were similar to those of Kyukpo, but different from Mokpo.