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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Fisheries and aquatic sciences
Journal Basic Information
Journal DOI :
The Korean Society of Fisheries and Aquatic Science
Editor in Chief :
Sungchul C. Bai
Volume & Issues
Volume 3, Issue 3_4 - Dec 2000
Volume 3, Issue 2 - Sep 2000
Volume 3, Issue 1 - Jun 2000
Selecting the target year
Rotifer Fauna of Natal Streams of Chum Salmon (Oshipcheon)
Song Min Ok ; Jin Deuk-Hee ;
Fisheries and aquatic sciences, volume 3, issue 2, 2000, Pages 71~77
Rotifers inhabiting Oshipcheon (Samcheog-city), one of the natal streams of chum salmon in the east coast, were studied taxonomically. As a result, 19 species/subspecies were identified, and of which five rotifers are newly recorded from Korea: Cephalodella forficula, Dicranophorus forcipatus, Notommata glyphura, Bryceella tenella, and Habrotrocha collaris. Among these Korean new records, Habrotrocha collaris is also new to Asia.
Influence of Daily Water Temperature Changes on Chemiluminescent Response of Phagocytes and Mortality in Cultured Gray Mullet (Mugil cephalus L.)
Kim Ki Hong ; Hwang Yoon Jung ; Kwon Se Ryun ; Huh Sung-Hoi ;
Fisheries and aquatic sciences, volume 3, issue 2, 2000, Pages 78~82
The influence of daily water temperature changes on chemiluminescent (CL) response of phagocytes, plasma glucose level and mortality in cultured gray mullet (Mugil cephalus) was investigated. Among three experimental temperature groups, the fish in group I and group II were maintained constantly at
, respectively, and those in group III were suffered daily elevation of water temperature from
for 5 hours, then restored again to
. After 1 week of maintaining at each experimental tank, the fish in group III showed significantly lower CL peak value (p < 0.01) and higher plasma glucose levels (p < 0.05) than those in group I and group II. The cumulative mortality of group III was
within 3 days after being subjected to acute handling stress. On the other hand, the cumulative mortalities of group I and group II were
, respectively. In conclusion, gray mullet farms, especially, in the vicinity of thermoelectric power plants should avoid stressing the fish during periods of high water temperature.
Identification of Cochlodinium polykrikoides against Gyrodinium impudicum and Gymnodinium catenatum in Field Samples using FITC Lectin Probes
Cho Eun Seob ; Kang Dong Woo ; Cho Yong Chul ;
Fisheries and aquatic sciences, volume 3, issue 2, 2000, Pages 83~87
We have investigated lectin binding patterns in order to apply binding records of previous laboratory experiments to field settings before the first ourbreaks of harmful algal bloom (HAB). Although cells were grown under different conditions, the binding patterns were the same as in the control. In addition, culture days was not associated with the binding patterns, when compared with the control. In nature, this results suggest that ECA, HPA and WGA lectin are able to discriminate between C. polykrikoides and G. impudicum, as well as ECA and SBA have a capability as a tool for differentiating between C. polyrikoides and G. catenatum, although these species are closely similar under the light microscope fiexed with Lugol solution.
Genetic Variation in Early Survival of Chum Salmon Families with Respect to Seawater Temperature
Choe Mi-Kyung ; Yeo In-Kyu ;
Fisheries and aquatic sciences, volume 3, issue 2, 2000, Pages 88~96
The present study estimated the variation of early survival of chum salmon families with respect to temperature and size after transfer to seawater. Heritability for seawater tolerance of half-sib families was also estimated at 45 days after hatching. Gametes were collected from 6 male and 18 female chum salmon to make 18 paternal half-sib families. Seawater tests were carried out at 3, 7 and
seawater and compared with freshwater. Survival was significantly affected by seawater temperature. The highest seawater tolerance was obtained in 45-day old chum salmon at
seawater and the lowest seawater tolerance was obtained at
. Overall survivals in seawater tolerance at
varied among families. There were significant variance in fry survival among females (P=0.0001), and among males (P=0.0001). The heritabilities of survival in seawater in chum salmon were estimated to be 0.32-0.34 for the sire components at 45 days after hatching in 1998.
The Fluctuation Characteristics of the Water Mass and the Current Structure of the Southeastern Region of The East Sea
Lee Chung Il ; Cho Kyu Dae ;
Fisheries and aquatic sciences, volume 3, issue 2, 2000, Pages 97~110
To investigate characteristics of water masses and current structures around Noto Peninsula located in south-east coastal region of the East Sea, observation results of CREAMS (Circulations Research of the East Asian Marginal Seas) cruise and data report of oceanographic observation (Japan Meteorological Agency) in June, 1995 and 1996 were used. Water mass showing characteristics of Tsushima Warm Current (TWC) exists over the continental shelf. The depth is shallower than 200m and its width and thickness are 190km and 200m, respectively. Minimum level of dissolved oxygen occurred at the layers of maximum salinity. In the current structure, a noteworthy phenomenon is that the positions of the high-salinity water (more than 34.6 psu) match well with the distributions of the southwestward flow. In June of 1995 and June of 1996, a southwestward flow were separated into two parts along line C and line G. Current directions derived from the temperature and salinity match well with the distributions of the geostrophic currents in the vertical sections. The isothermal lines and the isohaline, which exist horizontally along the coastal area of the Japan, change abruptly at the frontal area of the Noto Peninsula, then turn toward the center of the East Sea. The dynamic depth anomalies centering around the region far northwest of the Noto Peninsula were relatively high, compared to those of other regions. The isopycnic surface (sigma-t, 25.8) existed near the surface in the central part of the East Sea, but, at the depth of 100m, the isopycnic surface was found in the coastal waters.
Ichthyotoxicity of a Harmful Dinoflagellate Cochlodinium polykrikoides: Aspect of Hematological Responses of Fish Exposed to Algal Blooms
Kim Chang Sook ; Bae Heon Meen ; Yun Seong Jong ; Cho Yong Chul ; Kim Hak Gyoon ;
Fisheries and aquatic sciences, volume 3, issue 2, 2000, Pages 111~117
To clarify the ichthyotoxic mechanisms of a harmful dinoflagellate Cochlodinium polykrikoides, hematological responses of the flounder Paralichthys olivaceus and red sea bream Pagrus major exposed to this algal bloom were investigated. The mortality of red sea bream was considerably larger than that of flounder, and the threshold lethal density of C. polykrikoides to the test fish was approximately 3,000 cells/ml. Blood
declined in proportion to the increasing density of algal cells. The blood
of moribund fish was about
of control test fish. Particularly, the fishes began to be killed when the blood
fell below 30-40 mmHg. However, the blood pH dropped almost 1.0 unit just before fish kill. Hemoglobin and hematocrit levels of fish exposed to C. polykrikoides of 5,000 cells/ml for 24 h and of moribund fish did not show great difference. The concentrations of plasma
were slightly elevated to different magnitudes except
and plasma osmolality was also increased in Cochlodinium-exposed fish. In the plasma cortisol level, these values of moribund flounder and red sea bream were 4- 5 times higher than those of control fish. These results suggest that the drop of blood
was may be one of the principal causes of fish kill by C. polykrikoides, and the changes of other hematological parameters were secondary responses elicited by the decrease in blood
Comparison of Lipid Classes and Fatty Acid Compositions among Eight Species of Wild and Cultured Seawater Fishes
Moon Soo-Kyung ; Choi Byeong-Dae ; Jeong Bo-Young ;
Fisheries and aquatic sciences, volume 3, issue 2, 2000, Pages 118~125
Lipid classes and fatty acid compositions of eight species of wild and cultured seawater fish in Korea were investigated. Total lipid (TL) contents of wild and cultured fish were
, respectively, except for rockfish and striped beakperch. Non-polar lipids (NL) in all fish samples comprised approximately
of the TL content. The proportion equation of NL content to TL content was y=0.9296x-0.4468 $(R^2=0.98l2, p<0.001)$. The most abundant NL class was triglyceride. The prominent fatty acids in all fish samples were 16: 0, 18: 1(n-9), 22 : 6(n-3) (docosahexaenoic acid, DHA), 16: 1(n-7), 20 : 5 (n-3) (eicosapentaenoic acid, EPA), 18 : 0 and 18 : 1(n-7). The polyunsaturated fatty acid (PUFA) group was the richest among the total fatty acids (TFA). DHA and EPA were comprised of approximately
of n-3 PUFA. There was a positive correlation between TFA content and n-3 PUFA content; y=0.292x-0.0055 $(R^2=0.9349, p<0.001)$. The n-3 PUFA content of the cultured fish was approximately twice as much as that of the wild fish. Therefore, cultured fish were proven to provide better sources of n-3 PUFA if compared to wild fish.
The Resting Eggs of Marine Cladocerans in the Intertidal Sea-bottom Sediments of Gomso Bay, Korea: Distribution and Evidence of Egg Banks
Jo Soo-Gun ; Park Jeong-Ok ; Suh Hae-Lip ;
Fisheries and aquatic sciences, volume 3, issue 2, 2000, Pages 126~134
We investigated the distribution of the marine cladoceran resting eggs in the intertidal sediments of Gomso Bay, Korea and compared the data with those in the subtidal sediments. The abundance of the eggs in the top 6cm of the sediments was higher than that in the other depths. The abundances of the eggs in seaward intertidal sediments below mean sea level (MSL) were higher than those in the sediments over MSL, but were not significantly different from those in the subtidal sediments. The distribution of the resting eggs of cladocerans in the intertidal sediments was affected by the grain-size and moisture content of sediments. The results of the present study suggest that the intertidal sediments as well as the subtidal sediments are a potential egg bank which plays important roles in population dynamics of zooplankton in coastal waters, in particular, recruitment of eggs into plankton.
Effect of Testosterone on the mRNA Levels of Gonadotropin Subunits in the Immature Rainbow Trout Pituitary
Kim Dae-Jung ; Aida Katsumi ;
Fisheries and aquatic sciences, volume 3, issue 2, 2000, Pages 135~142
In order to clarify the role of gonadal sex steroids in the synthesis of gonadotropin (GTH) subunits in immature rainbow trout, we examined in vitro and in vivo effects of testosterone (T) on the pituitary mRNA levels of GTH I
, GTH II
and a subunits by Northern blot analysis and on the pituitary content levels of GTH I
and GTH II
by radioimmunoassay (RIA). The mRNA levels of the a subunit in T-treated fish were not changed more dramatically than those in control fish both in vivo and in vitro. Interestingly, the mRNA levels of GTH I
in T-treated fish were shown to be slightly lower than those in the control fish under these experimental conditions, but no differences were observed in pituitary GTH I
contents. In contrast, the mRNA levels and pituitary contents of GTH II
subunit were strongly increased by T both in vivo and in vitro. These results demonstrate that the expressions of GTH I
subunit genes in immatue rainbow trout pituitary are subjected to differential regulation by T.
Application of Optimum Multiparameter Analysis on Seawater Mixing in the South Sea of Korea Using Ra Isotopes
Lee Tongsup ; Yang Han-Soeb ; Kim Hyang-Bae ;
Fisheries and aquatic sciences, volume 3, issue 2, 2000, Pages 143~150
Assuming that summer surface waters in the South Sea (northern East China Sea) are formed mostly by a mixing of three source water (Changjiang Discharge Water; Kuroshio Water and Yellow Sea Surface Water) we apply optimum multiparameter (OMP) analysis to calculate the mixing ratio of each source water to a given surface water. Since OMP requires more parameters than the number of water types (three in this study), we utilize two radium isotopes of dissolved
along with temperature and salinity. Parameter values of each source water are deduced from in situ and historical data. Results with three source of waters on the surface waters are quite promising with less than
of unanswered portions. Results not only reproduce the measured temperature and salinity faithfully but also discern the water masses of similar T and S according to their source water mixing. Extending OMP analysis to a whole water column obviously requires more parameters because more source waters are involved in the water mass formation. Original OMP routine utilized dissolved oxygen and nutrients. However, they seem to be perturbed too much by biological activities in the case of shallow waters. We discussed the use of other potential parameters. Also the benefit of parameter substitution is briefly introduced for the future OMP application on shallow waters.
Effects of Nitrogen and Sodium on Growth in Phaeodactylum tricornutum (Bacillariophyceae)
Lee Soon Jeong ; Choi Han Gil ; Nam Ki Wan ;
Fisheries and aquatic sciences, volume 3, issue 2, 2000, Pages 151~155
Phaeodactylum tricornutum (Bacillariophyceae) is a marine diatom which has been supplied as a food of bivalves. In this study, growth responses of P. tricornutum to some nitrogen sources and sodium were investigated by measuring cell number and contents of chlorophyll a in culture. In medium with nitrogen and sodium, brisk cell division occurred and maximum growth rate was respectively found in the medium with 150 mg/l of nitrate and 10 mg/l of ammonium and urea. At 10-500 mg/l ammonium and urea and 200-500 mg/l nitrate, specific growth rate decreased slightly. However, no cell division observed in sodium-deficient medium, regardless of presence or absence of nitrogen. This suggests that sodium is required for the nitrogen uptake of P. tricornutum, resulting nitrogen uptake leading to cell division. Also the upper limits of ammonium and nitrate for the growth of P. tricornutum seem to be 10 mg/l and 500 mg/l, respectively.
Geometry of the Model Purse Seine in Relation to Enclosed Volume during Hauling Operation
Kim Yong-Hae ;
Fisheries and aquatic sciences, volume 3, issue 2, 2000, Pages 156~162
Model experiments for a purse seine were carried out in order to measure the geometry of net shape and to estimate an enclosed volume by using 1177 scale model purse seine of 12.62m float line from an offshore mackerel purse seine. A model purse seine was set from a net box of shooting equipments and then pursing and hauling net by hauling equipment. The 3- D geometry shape of the purse seine net during hauling operation was measured by video image processing and tension of purse line by load cell. The 3-D geometry of the model purse seine during hauling operation could be represented with variables such as a ratio of shooting diameter or maximum net depth and a ratio of hauling operation time. Horizontal shapes of float line and lead line were varied from a circle after shooting to an ellipse with pursing and hauling. Projected lateral shape of purse line was observed and formulated as a shape of a water drop. The cross sectional shapes of curved net from two directions were varied such as sine function or polynomial curves. Therefore, enclosed volume of a purse seine in relation to fish school behaviour can be approximated using two main variables from relevant equations.
A Numerical Experiment on the Inter-annual Variation Induced by the Current in a Basin with Dimension Comparable to the East Sea
Cho Kyoung-Ho ; Seung Young Ho ;
Fisheries and aquatic sciences, volume 3, issue 2, 2000, Pages 163~171
A series of numerical experiments are performed to examine the generation of inter-annual variations by an inertial current in an idealized semi-enclosed basin with dimension comparable to that of the East Sea. Model results indicate that the inter-annual variations dominate the kinetic energy spectrum with a peak around the time scales of 2-3 years. These variations are mostly due to the westward propagating meanders and large eddies induced by the instability of current, indicating their dependency on the eddy-resolving capacity of the model. They are generated in the interior of the basin but their energy is largely confined near the western boundary such that the east-west dimension of the basin cannot be considered as a critical factor as long as the basin covers enough western boundary region. Overall, this study suggests that the inter-annual variation observed in the East Sea is due to the meandering and large eddies induced by the instability of the current.