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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Fisheries and Aquatic Sciences
Journal Basic Information
Journal DOI :
The Korean Society of Fisheries and Aquatic Science
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Volume & Issues
Volume 25, Issue 6 - Nov 1992
Volume 25, Issue 5 - Sep 1992
Volume 25, Issue 4 - Jul 1992
Volume 25, Issue 3 - May 1992
Volume 25, Issue 2 - Mar 1992
Volume 25, Issue 1 - Jan 1992
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On the Bottom Water in the Western Channel In the Korea Strait-1 - the inflow path of the bottom cold water -
YUN Jong-Hooi ; KANG Shin-Hyoun ; CHO Kyu-Dae ; MOON Chang-Ho ;
Korean Journal of Fisheries and Aquatic Sciences, volume 25, issue 1, 1992, Pages 1~14
With 16 years' oceanographic data(1973-1988) of the National Fisheries Research and Development Agency and the CTD data collected by a training ship of Korea Maritime University during Nov. 6-11, 1989, the inflow path of the bottom cold water in the western channel of the Korea Strait were investigated. Temperature of the bottom water in the western channel shows the lowest in summer and large annual variation. According to the temperature distributions in the years when the bottom cold water exists in the western channel in summer, the cold water in the southwestern region of the East Sea seems to intrude into the western channel through the sea southeast 10- 15 miles off Ulsan with its properties showing slight change during advection.
Influences of the Sea Surface Wind on Current and Thermal Structures in the Southwestern Part of the East Sea of Korea
NA Jung-Yul ; PAENG Dong-Guk ;
Korean Journal of Fisheries and Aquatic Sciences, volume 25, issue 1, 1992, Pages 15~28
Temporal variations of the path of the East Korea Warm Current(EKWC) which flows northward along the east coast of Korea were analysed to investigate whether the EKWC directly influences the existence of the so-called Warm Core in the Ulreung basin. From the 13 years(1975-1987) data of the Fisheries Research and Development Agency(FRDA), the
isotherm at the 100m depth and the depth of
isotherm and the temperature field at the 200m depth were used for identification of the path and the central position of the Warm Core. Sea surface winds computed from the surface pressure charts gave the monthly-averaged wind stress curl over the East Sea which was used for determination of the Sverdrup transport. And the mass transport stream functions were computed by use of the Sverdrup balance. The variations of the path show that the EKWC does not always have a fixed path and fluctuates with time. And the existence of the Warm Core is independent upon the presence of the EKWC even when the EKWC doesn't flow northward along the east coast of Korea. In view of the mass transport stream functions, the influences of the sea surface winds on the branching of the Tsushima Warm Currents and the presence of the EKWC were investigated. The presence of the EKWC may be hindered by the southward flow driven by the sea surface winds when the Tsushima currents are rather weak. A very weak correlation exists between the north-south component of the Sverdrup transport and the position of the Warm Core. However, a small but significant part of the southward transport across the latitudinal line of
indicates that cold water from the northern part of the East Sea may be driven and be forced to flow beneath the permanent thermocline in such a way that the thermal structure of the Warm Core and its position might be changed.
Estimation of Population Ecological Characteristics of Small Yellow Croaker, Pseudosciaena polyactis off Korea
ZHANG Chang-Ik ; KIM Yong-Mun ; YOO Sin-Jae ; PARK Cha-Soo ; KIM Su-Am ; KIM Chong-Kwan ; YOON Seong-Bong ;
Korean Journal of Fisheries and Aquatic Sciences, volume 25, issue 1, 1992, Pages 29~36
This paper deals with the estimation of population ecological parameters, including growth parameters, survival rates, instantaneous coefficient of natural mortality and age at first capture, of the small yellow-croaker, Pseudosciaena Polyactis in Korean waters, which determine fluctuations in stock abundance. For describing the growth of the small yellow croaker, von Bertalanffy growth equation was recommended for the purpose of stock assessment, although the Gompertz model yielded the closest fit. The survival rate (S) of the croaker was estimated to be 0.219 (variance=0.0000262), and the instantaneous coefficient of natural mortality (M) was 0.4
. From the estimates of S and M, the instantaneous coefficient of fishing mortality (F) was calculated to be 1.11
implying an impact from fishing three times that of natural mortality. Finally, the age at first capture
was estimated to be 0.602.
A Study on Fluctuations in Biomass of Small Yellow Croaker, Pseudosciaena polyactis, off Korea
ZHANG Chang-Ik ; KIM Yong-Mun ; YOO Sin-Jae ; KIM Chong-Kwan ; AHN Soon-Mo ;
Korean Journal of Fisheries and Aquatic Sciences, volume 25, issue 1, 1992, Pages 37~44
Annual biomasses of small yellow croaker, Pseudosciaena polyactis, were estimated by biomass-based cohort analysis (Zhang, 1987) , using data on annual catch in weight at age for 1970-88 in Korean waters. Annual biomass of croaker was highest in 1974 with about 100,000 mt, declining to a level of 20,000-30,000 mt after 1981. Adult biomass also showed a peak in 1974 with about 50,000 mt. Afterwards, however, it continuously dropped. According to the estimates of biomass at age obtained from this analysis, the age composition of small yellow croaker in the 1980's differed greatly from that in the 1970's. The proportions of older croakers (>5 years) were very low in the 1980's and even the biomasses of young croakers (1-4 years) were at a very low level in the 1980's. Year classes of 1968, 1972 and 1978 appeared to be relatively dominant. The mean value of instantaneous fishing mortality (F) in the 1980's was twice that of the 1970's. Recruitment of croaker exhibited an unusally linear relationship with adult stock biomass.
Utilization of Chitin Prepared from the Shellfish Crust 1. Functional Properties of Chitin, Chitosan, and Microcrystalline Chitin
AHN Chang-Bum ; LEE Eung-Ho ;
Korean Journal of Fisheries and Aquatic Sciences, volume 25, issue 1, 1992, Pages 45~50
To utilize shellfish by-products effectively, chitin, chitosan, and microcrystalline chitin were prepared from 6 kinds of crustacean shells(Antarctic krill, Euphausia superba; Red snow crab, Chinonecetes japonicus: Daelongsuyum shrimp, Solenocera prominentis: Lobster, Linuparus trigonus: Gasibal shrimp, Nephrops thomsoni: Blue crab, Portunus trituberculatus) and their functional properties were studied. Apparent volume(AV), settling volume(SV), water binding capacity(WBC), and fat binding capacity(FBC) of various chitins, chitosans, and microcrystalline chitins ranged from
, respectively, and the krill chitin and chitosan had the highest AV, SV, WBC, and FBC of them. Chitins and chitosans did not produce emulsion but microcrystalline chitins showed emulsifying properties. Emulsifying capacity and stability of various microcrystalline chitins ranged from
, respectively. Dye binding capacity of microcrystalline chitins was higher than that of chitins or chitosans.
Utilization of Chitin Prepared from the Shellfish Crust 2. Effect of Chitosan Film Packing on Quality of Lightly-Salted and Dried Horse Mackerel
AHN Chang-Bum ; LEE Eung-Ho ;
Korean Journal of Fisheries and Aquatic Sciences, volume 25, issue 1, 1992, Pages 51~57
The preservative effect of chitosan film packing on quality of lightly-salted and dried horse mackerel was studied. In preparation of chitosan film, blue crab shell chitosan was dissolved in dilute acetic acid
, filtered, and spreaded on plastic plate and dried at
. The chitosan film thus obtained was neutralized with 1.0N NaOH for 2 hrs and dried at room temperature after washing several times with distilled water. The lightly-salted and dried horse mackerel product was prepared by drying for 4 hrs at
in hot air dryer after packing with the chitosan film. During storage at
, moisture content of the product was higher than that of the reference, but contents of VBN(volatile basic nitrogen) , amino nitrogen, and TMA of the product on dry basis were lower than those of the reference. Viable cell count, TBA value, and peroxide value of the product were also lower than those of the reference. Judging from the result of sensory evaluation, the chitosan film packing in the storage of lightly-salted and dried horse mackerel was remarkably elongated shelf-life of the product. From the results of chemical and sensory evaluation, it was concluded that chitosan film packing was an effective method for retaining the quality of lightly-salted and dried horse mackerel.
A Numerical Model on the Inflow into the Japan Sea: the Formation and Transport of the Tsushima Warm Current
NAM Soo-Yong ; SEUNG Yong-Ho ;
Korean Journal of Fisheries and Aquatic Sciences, volume 25, issue 1, 1992, Pages 58~64
A barotropic model is run over the Northwest Pacific Ocean to examine the formation and transport of the Tsushima Warm Current. The results indicate that the Tsushima Warm Current is a downstream extension of the Taiwan Warm Current. Local wind does not change the amount of transport of Tsushima Warm Current but it changes much the initial flow pattern of Tsushima Warm Current such that for southerly wind, the transport is through the Taiwan Strait but for northerly wind, it is through the eastern side of Taiwan.
A Two-layer Model for the Effect of Cold Water Formation on the East Korean Warm Current
SEUNG Young-Ho ; NAM Soo-Yong ;
Korean Journal of Fisheries and Aquatic Sciences, volume 25, issue 1, 1992, Pages 65~72
It is believed that the lower cold water is formed by winter cooling in the north of the East(Japan) Sea. To examine its effect on the general circulation of the East Sea, we performed a two-layer numerical model with realistic bottom topography. First a circulation is generated by imposing only an inflow and an outflow which is then modified by adding the cooling effect in the north. The interface between the two layers rises due to cooling and propagates along the coast as internal Kelvin waves. About 7 months after the cooling starts, all coastal areas of the basin have higher elevation than that in offshore region. This induces baroclinic currents resulting in clockwise(anticlockwise) circulation in upper (lower) layer of the basin. It is concluded that the East Korean Warm Current strengthens as a result of lower cold water formation.