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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 23, Issue 6 - Dec 1990
Volume 23, Issue 5 - Nov 1990
Volume 23, Issue 4 - Sep 1990
Volume 23, Issue 3 - Jul 1990
Volume 23, Issue 2 - May 1990
Volume 23, Issue 1 - Feb 1990
Volume 22, Issue 6 - Jan 1990
Selecting the target year
A Study on Sea Water and Ocean Current in the Sea Adjacent to Korea Peninsula 1. Physical Processes Influencing the Surface Distributions of Chlorophyll and Nutrient in the Southern Sea of Korea in Summer
YANG HaH-Soeb ; KIM Seung-Soo ;
Korean Journal of Fisheries and Aquatic Sciences, volume 23, issue 6, 1990, Pages 417~424
Effect of physical processes on the surface distributions of chlorophyll-a and nutrients was investigated in the southern sea of Korea during summer season. The northwestern area of Cheju Island had higher concentrations of the chlorophyll-a and nutrients than its southeastern area. A nutrient-rich patch was observed in the western area of Cheju Island and the northern area of
respectively. It seems that the patch in the western area of Cheju Island is formed by horizontal extension of the low-saline Coastal Water of China Contiental(CWCC), while the patch in the northern area of
by vertical mixing. Also, the high chlorophyll-a in the vicinity of Cheju Island appears to be ascribed to sufficient supply of nutrient from bottom water by coastal upwelling.
Distribution of Walleye Pollock, Theragra chalcogramma, Spawning in Shelikof Strait, Gulf of Alaska, Based on Acoustic and Ichthyoplankton Surveys 1981, 1984 and 1985
KiM Suam ; NUNNALLEE Edmund P. ;
Korean Journal of Fisheries and Aquatic Sciences, volume 23, issue 6, 1990, Pages 425~438
Acoustic and ichthyoplankton data collected from Shelikof Strait in 1981, 1984 and 1985 were examined to determine spawning ground and period of walleye pollock, Theragra chalcogramma. Walleye pollock in the Gulf of Alaska migrated into Shelikof Strait for spawning during late winter and early spring. They entered Shelikof Strait via the warm and saline deep layer (continental slope water mass) in the southwestern channel, and major fish schools concentrated for spawning along the deep trough (250~300m) in the western part of the central strait. Peak spawning activity occurred there from late March to early April. Peak spawning time and area in Shelikof Strait varied little between years, despite difference in hydrography. Geographical advantages together with some oceanographic phenomena (reduced water transport and reduced mixed layer depth in spring) made that area an optimal spawning ground in the Gulf of Alaska during early April. After early April, spawning intensity decreased rapidly and the spawning area tended to expand to the northeast and southwest.
A Harpacticoid Copepod Parasitic in the Cultivated Brown Alga Undaria pinnatifida in Korea
PARK Tai-Soo ; RHO Yong-Gil ; GONG Yong-Gun ; LEE Dong-Yeub ;
Korean Journal of Fisheries and Aquatic Sciences, volume 23, issue 6, 1990, Pages 439~442
We have examined harpacticoid copepods inhabiting the phaeophyte Miyok, Undaria pinnatifida (Harvey), on the southern coast of Korea and cultured in the laboratory pieces of Miyok frond heavily infested by frond-mining nauplii to identify the harpacticoid copepod to which those nauplii belong. Of the harpacticoids found in Miyok-washings, only Amenophia orientalis Ho and Hong and an unidentified species of the genus Scutellidium occurred consistently in all Miyok samples examined. Many females of both species carried egg sacs. In the cultures the frond-mining nauplii developed, in 15 days at
, into cope-podid stages or adults that were all identified with Amenephia orientalis. It is therefore concluded that this species is the causative agent for the so-called pinhole disease of the cultivated Miyok on the southern coast of Korea, which is diagnosed by the appearance on the thallus of numerous pinholes occupied by developing nauplii.
Fishing Mortality and Abundance of the Silver croaker, Otolithes argenteus in the Kuwait's Waters
LEE J. U. ;
Korean Journal of Fisheries and Aquatic Sciences, volume 23, issue 6, 1990, Pages 443~450
The virtual population analysis technique was applied to the silver croaker, Otolithes argenteus, stock based on length frequency composition, age-length key and nominal catches taken by the trawl fleet and fixed-stake nets in the Kuwait's waters during
. One-year-old fish was dominant, whereas three-year-old and older fish were at a very low level. Fishing mortality was much higher in the age groups of 2 and 3 than in the others. A strong year-class occurred in 1980 and 1981. Population size of fishable stock markedly decreased from 1982 to 1985 and remained at a low level during
. The effects of changes in fishing effort showed that an increase in fishing effort would not lead to benefits in yield and would comprise more young and fewer old fish, whereas a reduction in fishing effort to a certain level (by
) from the fishing effort level on the average during
could bring some small advantage to the fishery consisting of fewer young and older fish.
Improvement of the Accuracy of Supershort Baseline Acoustic Positioning System by Kalman Filter
PARK Hae-Hoon ; YOON Gab-Dong ;
Korean Journal of Fisheries and Aquatic Sciences, volume 23, issue 6, 1990, Pages 451~456
Underwater acoustic navigation and position fixing systems have been extensively used not only in surface position fixing but also in underwater position fixing. Tn recently, application of these systems has been in the field of underwater inspection of offshore platforms, where it is vital to track the position of an unmanned submersible or diver carrying underwater cameras and nondestructive testing equipment. But these systems are included the fixing errors as results of a signal with additive noise, the attenuation of sound and the interference effects due to multipath reflection and forward scattering. In this paper to improve the position fixing by the supershort baseline acoustic position system, a method to apply the Kalman filter to the fix of the system is proposed and the digital simulation under noise condition is conducted. The optimal positions by the Kalman filter are compared with original positions, and it is confirmed that the results of the pro-posed method are evidently more accurate.
Larval Development of Balanus trigonus Darwin(Cirripedia: Thoracica: Balanidae) reared in the laboratory
LEE Chu ; KIM Chang-Hyun ;
Korean Journal of Fisheries and Aquatic Sciences, volume 23, issue 6, 1990, Pages 457~467
Sessile barnacle, Balanus trigonus Darwin, was collected from the intertidal rocks and the external shells of bivalve Mylius coruscus. The nauplius and cyprid larvae were cultured in a constant temperature cabinet at a temperature of
and a light regime of 14 h light and 10 h darkness. Larval development includes the six nauplius stages and a cyprid stage prior to settlement and metamorphosis to the young adult. Morphological characteristics including antennules, antennae and mandibles are described and illustrated. All nauplius larvae have trilobed labra typical in balanoides. The developmental time taken from newly hatched nauplius I to cyprid was
days and averaged 11 days.
Coastal Algal Blooms Caused by the Cyst-Forming Dinoflagellates
KIM Hak-Gyoon ; PARK Joo-Suck ; LEE Sam-Geun ;
Korean Journal of Fisheries and Aquatic Sciences, volume 23, issue 6, 1990, Pages 468~474
Eight species, 6 Dinophyceae and 2 Raphidophyceae, caused a bloom in the southeastern coastal waters mainly in Chinhae Bay in Korea from March to September since 1982. Scrippsiella trochoidea and Heterocapsa triquetra bloomed in March then ensued a vernal species Heterosigma akashiwo. And Cochlodinium sp. and Alexandrium affine were occurred as causative organism in fall next to the estival dinoflagellates Gyrodinium instriatum and Pheopolykrikos hartmannii. Among them, spatio-temporal similarity of outbreak was significant in Heterosigma akashiwo since 1983, and a bit apparent for Cochlodinium sp.. The density was in the level from
and was dependent on the cell size rather than environmental characteristics.
Effects of Changes in Fishing Effort on Yield of Kuwait's Commercial Fish Stocks
LEE J. U. ;
Korean Journal of Fisheries and Aquatic Sciences, volume 23, issue 6, 1990, Pages 475~483
An assessment of Kuwait's commercial fish stocks: hamoor (Epinephelus tauvina), zobaidy (Pampus argenteus), nakroor (Pomadasys argenteus) and sheiry (Lethrinus nebulosus), was conducted using length-frequency data, mean growth and mortality estimates obtained during 1981
1988. The length-cohort analysis indicated that increases in fishing effort would not lead to long-term gains in yield of the stocks at the current estimate of natural mortality rate (M). At high M which was assumed arbitrarily, some benefit in yield could be obtained, especially for hamoor and sheiry. At low M, the yield of all stocks decreased with increased fishing effort. Increases in fishing effort resulted in significant dec-line in spawning stock size for all the stocks. Yield-per-recruit analysis indicated that, un-der low M assumption, a higher yield can be obtained for zobaidy and nakroor by reducing fishing effort. At moderate M, decreases in fishing effort brought gains in yield per recruit of the stocks, but it was not substantial compared with the present level of M. At high M, most of the stocks reached the maximum yield-per-recruit. Overall, increased fishing effort either will not be associated with large long-term gains in yield or, in some stocks, might cause a decline from the present level.