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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Fisheries and Aquatic Sciences
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Journal DOI :
The Korean Society of Fisheries and Aquatic Science
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Volume & Issues
Volume 32, Issue 6 - Nov 1999
Volume 32, Issue 5 - Sep 1999
Volume 32, Issue 4 - Jul 1999
Volume 32, Issue 3 - May 1999
Volume 32, Issue 2 - Mar 1999
Volume 32, Issue 1 - Jan 1999
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Physico-chemical Properties and Cold Storage of River Puffer (Takifugu obscurus) Milt
CHANG Young Jin ; LIM Han Kyu ; CHANG Yun Jeong ; KIM Hyung Sun ; HUH Hyung Tack ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 243~246
To obtain the basic data for the preservation of river puffer (Takifugu obscurus) sperm, experiments were carried out on the physico-chemical properties and cold storage of milt. The average number of sperm and spermatocrit in milt stripped were
1.4, respectively. Osmolality of seminal fluid was 266
2 mOsm/kg, Total protein and total lipid from sperm were higer than that from seminal fluid.
concentrations were higher in the seminal fluid than in the sperm, while
concentrations were lower in the seminal fluid. When sperm of river puffer were preserved in
with various diluents for 16 days, fertilization rate was
. It suggested that cold storage of river puffer sperm was detrimental to sperm fertility.
Calcium Absorption Accelerating Effect of Chitosnn Oligosaccharides prepared by Ultrafiltration Membrane Enzymatic Reactor
JEON You-Jin ; KIM Gyu-Hyung ; PARK Pyo-Jam ; KIM Se-Kwon ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 247~251
In spite of various bio-functionalities of chitosan, the effects in vivo were still ambiguous because of its low absorption on organism. Therefore, chitosan oligosaccharides (COSs) are necessary to elucidate for an efficient utilization in vivo. COSs were prepared from chitosan using ultrafiltration membrane enzymatic reactor system with MWCO (molecular weight cut-off) 3,000 Da of membrane. Calcium absorption accelerating effect using COSs was examined by two methods, in vitro and in vivo. In vitro experiment, calcium absorption by the addition of COSs in a mixture solution of calcium and phosphate was higher approximately
than that by control. In vivo using rats, group taken the diet contained
COSs anil calcium chloride decreased about
of calcium content excreted from feces, and then, showed about
increase in breaking force of femur. These results demonstrated that COSs definitely involved in calcium metabolism in vivo.
Quality Characteristics of Salt-Fermented Anchovy Sauce and Sandlance Sauce
OH Kwang-Soo ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 252~255
The quality characteristics of the Korean traditional salt-fermented fish sauces, the traditional anchovy sauce (TAS) and the sandlance sauce(TKS) were evaluated comparing to the commercial anchovy sauce (CAS) and sandlance sauce (CKS). The acidity was higher in TKS than in TAS, whereas the contents of VBN, total-N and amino-N were higher levels in TAS. In color values, L and b values in TAS were generally higher than those in TKS, whereas a and
values were higher in TKS. The contents of total free amino acids in TAS and TKS were
(w/v), respectively. The contents or six amino acids, alanine, glutamic acid, leucine, isoleucine, valine and Iysine were higher in TAS, whereas the contents of arginine, glutamic acid, leucine, alanine and valine were higher in TKS. Nucleotides such as IMP and hypoxanthine were principal components in both TAS and TKS. The nitrogen related compounds, TMAO, TMA and total creatinine were determined to be
(w/v) in TAS, and those in TKS were
Comparison of Detectable Levels for Screening Residual Antibacterial Agents by Bioassay
JUNG Sung Hee ; KIM Jin Woo ; SOHN Sang-Gyu ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 256~260
Minimun-detectable levels to 28 antibacterial agents used for the prevention and the treatment of fish diseases were determined to establish optimal detective method of bioassay in fish by the EEC 4-plate method, the modified method of EEC 4-plate and the standard method of analysis in food safety regulation. The test organisms used in the methods of bioassay were as follows: Bacillus subtilis BGA (B. subtilis) and Micrococcus luteus ATCC 9341 (M. luteus) in the EEC 4-plate method, B. subtilis, M. luteus and Bacillus cereus var. mycoides ATCC 11778 (B. cereus) in the modified of EEC 4-plate, and B. subtilis, M. luteus, B. cereus and Bacillus stearothermophilis var. calidolactis C-953 (B. stearothermophilis) in the standard method. The standard method showed predominant sensitivity in the detection of penicillins (PCs), and was also highly sensitive to aminoglycosides (AGs). The sensitivity of standard method in the detection of tetracyclines (TCs), marrolides (MLs), nitrofuran derivatives(NFs) and quinolones (QNs) was very low, and against sulfonamides (SAs), however, was extremely low. The modified method of EEC 4-plate showed very high sensitivity to TCs. Both the EEC 4-plate and the modified method of EEC 4-plate showed competitively high sensitivity in the detection of PCs, MLs, NFs, QNs and SAs. All the methods studied in the experiment showed very low sensitivity against chloramphenicol (CMs). Consequently, the modified method of EEC 4-Plate was the best bioassay method with a wide range of sensitivity for the optimal detection of the residual antibacterial agents in fish.
Chronic Toxicity of Cyanide on Survival, Feeding and Growth of Israel Carp, Cyprinus carpio
JEE Jung-Hoon ; KANG JU-Chan ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 261~265
Chronic toxicity of cyanide on survival, feeding and growth rate were examined in the Israel carp, Cyprinus carpio under a continuous-flow system. Survival rate of the Israel carp was significantly affected by
cyanide concentration, and feed efficiency and feeding rate were also reduced above
cyanide concentration. Growth rate of the Israel carp exposed to
cyanide concentration were significantly decreased than that exposed to normal condition.
Immunohistochemical Identification of the Two Forms of Gonadotropin Releasing Hormones (sGnRH, cGnRH-II) in Spotted Sea Bass (Lateolabrax sp.) Brain
KIM Jung-Woo ; LEE Won-Kyo ; YANG Seok-Woo ; JEONG Kwan-Sik ; CHO Yong-Chul ; RHO Yong-Gil ; BANG In-Chul ; KIM Kwang-Soo ; KIM Sang-Koo ; YOO Myung-Sik ; KWON Hyuk-Bang ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 266~270
Two forms of gonadotropin releasing hormone (GnRH) are identified in the brain of adult mature spotted sea bass (Lateolabrax sp.) by immunohistochemical methods. Salmon GnRH immunoreactive (sGnRH-ir) cell bodies were distributed in the olfactory bulb, ventral telencephalon and preoptic region. Immunoreactive fibers were observed in the vicinity of the brain including the olfactory bulbs, the telencephalon, the optic nerve, the optic tectum, the cerebellum, the medulla oblongata and rostral spinal cord. In most cases, these fibers did not form well defined bundles. However, there was a clear continuum of immunoreactive fibers, extending from the olfactory bulbs to the pituitary. cGnRH-II-ir cell bodies were only found in olfactory bulbs. However, the distribution of cGnRH-II-ir fibers was basically similar to that of sGnRH-ir fibers except for the absence of their continuity between the olfactory bulbs and the pituitary. These data suggest that sGnRH and cGnRH-II are endogenous peptides and indicate the presence of multiple neuroendocrine functions in the brain of the spotted sea bass. It seems that sGnRH not only regulates GTH secretion but also functions as a neurotransmitter, whereas cGnRH-II functions only as a neurotransmitter.
Chemical and Gelling Properties of Alkali-Modified Porphyran
KOO Jae-Geun ; PARK Jin-Hee ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 271~275
The chemical and gelling properties of porphyran from Porphra yezoensis collected from Buan and Wido in Korea at different months of the year were studied. Crude porphyran was prepared by hot-water extraction and further purified by cetylpyridinium chloride precipitation, Crude porphyran and porphyran were modified by alkali treatment to eliminate sulfate. The yields of alkali-modified crude porphyran (AMCP) and porphyran(AMP) were between
of the dried algae weight and were maximum in February for Buan and January for Wido, respectively. Gel strength of AMCP were highest in February (
) for Buan and January (
) for Wido. Alkali modification increased 3,6-anhydro galactose content and the molar ratio of galactose and 3,6-anhydrogalactose of AMCP and AMP showed 1 : 0,8
1.1. GLC and FT-IR measurement of AMP showed that most of sulfate residues were combined to C-6 of galactose, Thus, results of this study suggest that crude porphyran extracted from Porphra yezoensis produces an agar of a reasonably good quality after alkali treatment.
Effects of Dietary Carotenoids on the Nuptial Color of the Bitterling (Rhodeus uyekii)
KIM Hwa Sun ; KIM Youhee ; CHO Sung Hwoan ; JO Jae-Yoon ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 276~279
The body color of fish fed were improved to be clearer by feeding the bitterling an artificial diet containing different carotenoids. The possibilities of using the bitterling, Rhodeus uyekii, an aboriginal fish of Korea, were studied by feeding the experimental diets supplemented with the various carotenoids (astaxanthin, lutein, and
-carotene). Amount of total carotenoids in the groups of fish fed by supplementation carotenoids were relatively higher than the control group of fish fed by no supplementation carotenoids. Especially, the group of fish fed by lutein supplementation diet showed most clarity in body color. The group of fish fed by astaxanthin supplementation diet showed the highest growth while the group of fish fed by lutein or
-carotene supplementation diet showed no significant different comparing to the control group of fish. The results from this study indicated that the bitterling could be a new ornamental fish as long as provided with the proper diet and culture condition.
High Density Cultivation of Rotifer, Brachionus rotundiformis in the Different Diets
PARK Huem Gi ; KIM Sung Koo ; PARK Kie Young ; PARK Young Je ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 280~283
The experiment was carried out in a 10
vessel in order to evaluate the growth and nutritional quality of rotifer, Brachienus rotundiformis fed by different diets (Freshwater Chlorella, Marine Chlorella and
-yeast) for the high density cultivation. The maximum densities for the rotifer fed on the marine Chlorella, freshwater Chlorella and
2,750 inds./ml, respectively. Therefore, the maximum densities for the rotifer fed on the marine Chlorella and freshwater Chlorella were higher than that for rotifer fed on the
-yeast The essential n-3 highly unsaturated fatty acid in rotifer fed on the marine Chlorella was
which was slightly lower than that in rotifer fed on the
, while it was higher than that in the rotifer fed on freshwater Chlorella,
. This result indicated that marine Chlorella could be appropriate diet for the high density cultivation of rotifer.
Effects of Formulated Diet or Macroalgae ( Undaria pinnatifida) on the Growth and Body Composition of Juvenile Abalone (Haliotis discus hannai) Cultured in Different Water Temperature and Shelter Type
LEE Sang-Min ; PARK Chan-Sun ; GO Tae Seung ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 284~289
A 15-week feeding trial was conducted to investigate the effect of formulated diet or macroalgae (Undaria pinnatifida) on the survival, growth and body composition of juvenile abalone (Haliotis discus hannai) under the different rearing environmental conditions (four shelter types and two water temperatures). Water temperature was maintained to
by heated and
by not heated natural sea water. The survival rate, weight gain and shell growth of abalone were affected by diet and water temperature (P<0.001). Survival rate of abalone fed the formulated diets was higher than that of abalone fed the Undaria pinnatifida at natural sea water (P<0.05), but this value was not influenced within abalone stocked at heated sea water in each shelter group (P>0.05). Weight and shell growth of abalone fed the formulated diets were significantly higher than those of abalone fed the Undaria pinnatifida at each temperature or shelter (P<0.05). Moisture, lipid and ash contents of the soft body were mainly affected by feeding diet than temperature or shelter (P<0.05). This study indicate that formulated diet used in this experiment could improve the growth of abalone independent of water temperature or shelter. and heated water could show a better growth of abalone in winter season.
Effects of Supplemental Squid Meal, Attractant, Herb or Lecithin in the Formulated Diets on Growth Performance in Juvenile Abalone (Haliotis discus hannai)
LEE Sang-Min ; LIM Yong-Su ; LEE Jong Kwan ; PARK Sung-Real ; MYEONG Jeong-In ; PARK Yun Jeong ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 290~294
An 18-week growth trial was conducted in flow-through aquarium system to investigate the effects of several additives in formulated diets on the growth and body composition of juvenile abalone (Haliotis discus hannai). Four replicate groups of abalone averaging 150 mg were fed one of four isonitrogenous (
) and isolipidic (
) diets containing
lecithin. In addition, these formulated diets were compared to commercial diet. Survival rate and shell growth of abalone were not significantly affected by the different dietary additives and commercial diet (P>0.1). Body weight gain of abalone fed the diet containing herb was higher than those of abalone fed the diets containing squid meal or lecithin and commercial diet (P<0.1). Moisture, protein, lipid and ash contents of soft body were not influenced by dietary additives and commercial diet (P>0.1). The results suggest that herb as additive in this formulated diet can improve weight gain of abalone.
Distribution of Ichthyoplankton in the Adjacent Waters of Yousu
YOO Jae Myung ; LEE Eun Kyung ; KIM Sung ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 295~302
To study the distribution of ichthyoplankton in the adjacent waters of Yousu, ichthyoplankton were sampled 4 times (September 1996, November 1996, February 1997 and May 1997). Four species of fish eggs and twenty-four species of fish larvae were identified. Among fish eggs, Engraulis japonicus eggs were the dominant species comprising
of the total fish eggs collected, followed by Callionymidae spp.
, Konosirus punctatus and Maurolicus muelleri occupied below
were unidentified. Most larval fish species were found in September (17 species). In fish larvae, Callionymidae spp. was the dominant species occupying
of total fish larvae collected and than followed by Gobiidae spp.
, Sillago japonica
, Omobranchus elegans
and the unidentified species were less than
. The larvae fish species collected in this study area were comprising the coastal sedentary species (Gobiidae, Callionymidae, Hexagrammos otakii and io on), and the warm water species (Auxis spp. and Coryphaena hipurus and Pomacentridae spp.) which were appearing by warm water current flowing near the costal area of Cheju Island.
Epizootiology of Perkinsus sp. Found in the Manila Clam, Ruditapes philippinarum in Komsoe Bay, Korea
PARK Kyung-Il ; CHOI Kwang-Sik ; CHOI Jin-Woo ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 303~309
Mass mortality of the Manila clam, Ruditapes philippinarum has been reported all along the west and south coast of Korea for the past several years. As a pathogenic agent, Perkinsus sp., an endoparasitic protozoan has been identified in this study and believed to be responsible for the mass mortalities. Prevalence and infection intensity of Perkinsus sp. was investigated from a Manila clam population inhabiting at Komsoe Bay in the west coast where mass mortality of the clam has been reported. A total of 142 Manila clam, 50 oyster, Crassostrea gigas, 10 ark shell, Scapharca broughtonii, and 5 predatory gastropada, Rapana venosa were examined for the presence and the quantity of Perkinsus sp. Ray's fluid thioglycollate medium method (FTM method) with modified Mackin's infection intensity scale and Choi's quantitative method were used in detecting and quantifying the parasite. All individuals of R. philippinarum examined in this study were infected with Perkinsus sp., indicating
prevalence while none of the oysters and the gastropods exhibited the parasite. Six to ten individual hypnospores of Perkinsus sp. were counted from the ark shells. The number of hypnospores in the clam tissues varied from 16,667 to 4,091,667, with a mean number of 1,077,628. Average infection intensity according to Mackin's was 2.87, indicating a moderate infection. A negative correlation was observed between the number of Perkinsus sp. in the tissue and the condition index, a ratio tissue wet weight to shell cavity volume. The clam size and the infection intensity in terms of total number of parasites were positively correlated; the bigger clam, the heavier infection. Such high number of Perkinsus sp. counted in the clams could be enough to cause physiological disturbance of clams, such as retarded growth and reproduction. It is also believed that such a high infection leads mortality of the clam via continuous draining of the energy by metabolic activities and reproduction of the parasites. Correlation between the condition index and the infection intensity observed in this study supports this hypothesis.
Physiological Responses of Grey Mullet (Mugil cephalus) and Nile Tilapia (Oreochromis niloticus) by Rapid Changes in Salinity of Rearing Water
CHANG Young Jin ; HUR Jun Wook ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 310~316
Physiological responses (cortisol, glucose, GPT, GOT, total protein, hematocrit, sodium, chloride, potassium, total calcium and osmolality), growth and survival rates of grey mullet (Mugil cephalus) and Nile tilapia (Oreochromis niloticus) by the manipulation of salinity were studied. Salinity was increased directly from freshwater to
and remained for 15 days. Then, salinity was decreased directly from seawater to freshwater and remained for other 15 days. All tilapias were dead at the third day, but
of grey mullet were survived at the 30th day. The grey mullet showed no significant differences for cortisol and glucose concentrations in the seawater and freshwater. However, those of the Nile tilapia were increased in seawater. The grey mullet showed no significant differences for sodium, chloride and potassium concentrations during experimental period. However, those of the Nile tilapia were significantly increased when exposed to seawater. The osmolality of grey mullet ranged between 293.5 mOsm/kg and 335.0 mOsm/kg for the whole experimental period.
Cyst formation of the marine ciliate, Vorticella sp. using MCCF medium
JUNG Min-Min ; RHO Sum ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 317~319
The ciliate, Vorticella was often observed in the rotifer mass culture tanks as common co-existing organism. This Vorticella performed as a predator for aquatic bacteria population in the rotifer mass culture tanks. This study was carried out to investigate a cyst formation medium of Vorticella in the laboratory for keeping Vorticella seed. The test organism Vorticella sp. was isolated from culture water of rotifer mass culture tanks. The cyst of Vorticella was formed by dried-method for the formation and maintainance of cyst. MCCF (Marine Ciliate Cyst Formation) medium was used for cyst formation (incystment), preservation and return to moving cell (excystment) of the marine ciliate, Vorticella sp. The cyst shape and size were ellipical type and
SD) of minor axis and
SD) of minor axis (n=10), The Vorticella cyst was kept in the room temperature (
) and total dark condition (24D:0L) during 1 year. The preserved cyst was transferred to moving cell state (excystment) only by the addition of fresh sea water in the MCCF medium. The five Vorticella sp. moving cells of excysted from cysts showed the growth up to 912
64 cells/10 ml in MCCF medium during the culture period of 16 days. This MCCF medium was very useful tool for cyst formation and species preservation of marine ciliate Vorticella.
Community Structure of Macrobenthos in the Subtidal Soft Bottom in Semi- enclosed Youngsan River Estuarine Bay, Southwest Coast of Korea
LIM Hyun-Sig ; PARK Kyung-Yang ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 320~332
Investigations were made on the community structure of macrobenthos in the subtidal soft bottom around semi-enclosed Youngsan River estuarine bay, southwest coast of Korea during the period from April 1995 to February 1996. Three macrobenthos samples were collected at 40 stations using a van Veen grab(0.1 m^2) during the study period. A total of 206 species of macrobenthos was identified. Their mean density and biomass (wet-weight, wwt) were
, respectively. Of these, there were 74 species of polychaetes (
), 60 molluscs (
), 51 crustaceans (
) and 21 miscellaneous taxa. Molluscs were represented as a density- and biomass-dominant faunal group with a mean density of
of the total benthic animals) and biomass of
of total biomass): It was followed by polychaetes with
of the total density). Total number of species and diversity were Bow in the inner estuarine bay containing high mud content and organic matter, whereas they were high in the outer stations containing low mud content and organic matter. Major dominant species were one biralve, Theora fragilis and three Polychaetes, Tharyx sp., Poeciloceatus johnonni and Lumbrineris lontifolia whose mean densities were
, respectively. Cluster analysis indicated that the study area could be divided into four station groups: two innermost station groups, a central bay and an outer station group. The species diversity increased from the inner station group toward the outer groups. These results were discussed in terms of both the environmental factors and distribution of benthic community.
Biosorption and Desorption of Pb by using Sargassum horneri
SUH Kuen-Hack ; AHN Kab-Hwan ; KIM Byong-Jin ; CHO Jin-Koo ; JIN Hyung-Joo ; HONH Yong-Ki ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 333~337
Biosorption of Pb to Sargassum horneri was evaluated. An adsorption equilibrium was reached in about 15 min. for Pb and Pb uptake was 185.5 mg Pb/g biomass. When Ca and Mg concentration increases in Pb solution, Pb was selectively adsorbed. The Pb adsorbed by S. horneri could be recovered by desorption process, and the desorption efficiency of Pb by 0.1 M HCl, 0.1 M
, and 0.1 M EDTA was above
, whereas the elution by 0.1 M NaOH was less efficient in the desorption of Pb. S. horneri was reused 6 cycle repeatedly after adsorption/desorption and the sum of uptake was 636.6 mg Pb/g biomass.
A Study on the Distribution and Composition of Floating Debris in the Coast of Korea II. Transport of Debris in Middle Part of Southern Sea
KIM Jong-Hwa ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 338~344
Floating debris was recorded from a training ship,
1 Kwanaksan, of Pukyong National University with about 10 knots speed at July 15th and 20th of 1997. The sampled area is the middle of southern sea of Korea, divided into 44 unit segments on survey routes. Debris fabrication materials were categorized with 6 items using the following; man-made or natural wood items, paper and cardboard, nylon netting and rope, styrofoam, plastics, floating metal and glass containers. All identified items within a 100
2 m wide band were recorded but ignored if beyond this boundary. The results of distribution and transport of floating debris in the area are as follows: 1. The quantities of debris during the survey were distributed from
. The most obvious trend is the widespread distribution of all debris. The highest densities of all debris were discovered in the coastal waters of Namhae and Yokji island, and of about 50 km off from the southward of Yokji and about 74 km off from the eastward of Komun island. Especially many of small styrofoams within
20 cm were observed in these segments. 2. Styrofoams and plastics were composed of
among all debris, next woods items,
. 3. The quantities, distribution shapes and composition of debris were varied as the observed duration and the natures of each items. 4. These phenomena are concluded that firstly they depend on the river discharges included debris due to precipitation falls, secondly inflow or dumping debris are drifting to the off-shore by Kuroshio currents present at their adjacent sea, But on the basis of the observed data it is difficult that source position, quantities and inflow items of debris are identified, and also the transport processes is pursue. further more surveys are continuously being investigated, and from this it is hoped that a much wider coverage can be achieved, perhaps on all sites of the Coast of Korea and contributed to the stationary area, finding of sources, removal method of debris and resistants of marine productivity.
An Ecological Study on the Sand Dollar, Astriclypeus manni (VERRIL 1867), in Hamdock, Cheju Korea
KANG DO-Hyung ; CHOI Kwang-Sik ; CHUNG Sang-Chul ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 345~352
The sand dollar, Astriclypeus manni is commonly encountered on a subtidal sand bottom along the coast of Cheju Island. limited information has been reported on their ecology despite their natural abundance. This study reports ecology and an annual reproductive cycle of the sand dollars present at Hamdock, northern coast of Cheju Island. A. manni collected from Hamdock revealed that they are 80 to 200 mm in test diameter. Sediment Brain size analysis indicated that A. manni mostly occurs on medium (particle diameter of 500
m) to very find sand (particle diameter of 125
m), particularly on fine sand (particle diameter of 250
m). Internal morphology and in situ observations on their feeding habit indicated that A. manni is a deposit feeder, feeding on organic debris contained in the sediment around its habitat. A. manni were more frequently observed near Zostrea marina bed where content of organic matter in the sediment is considered to be higher. Gonadal tissues of the male were yellow in color while female gonads appeared to be purple. Fully mature eggs, with a mean diameter of 381
m, and sperm were observed from the histological slides of the sand dollars collected in late July to August, suggesting that A. manni spawn during July to August when water temperature reaches 20 to
Ecophysiological Responses and Subsequent Recovery of Olive Flounder, Paralichthys olivaceus, Exposed to Hypoxia and Iron. I. Effect of Iron Concentration on the Growth of Olive Flounder
KANG Ju-Chan ; KIM Chang-Hoon ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 353~358
This study is to find out the effects of various iron concentrations on growth, feeding and feed efficiency of olive flounder, Paralichthys olivaceus, The growth rate, feeding rate and feed efficiency of olive flounder in each experiments were represented by the relative value. The relative growth rate and relative feed efficiency of olive flounder were kept almost constant below the iron concentration of 1.0 mg/
, but were significantly decreased above the 5,0 mg/
iron concentration. The growth rate, feeding rate and feed efficiency of olive flounder exposed to 10.0mg/
iron concentration were significantly decreased than that exposed to normal condition. From these results, it could be concluded that the high level of 5.0 mg/
iron concentration in the bottom water would curtail production of olive flounder in coastal area.
The Activities and Characteristics of Algicidal Bacteria in Chindong Bay
KIM Mu Chan ; YU Hong Sik ; OK Mi Sun ; KIM Chang Hoon ; CHANG Dong Suk ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 359~367
For investigating the activities of algicidal bacteria, the variations of algicidal bacterial population and chlorophyll-a were checked weekly in Chindong Bay, Korea from May to July, 1998. For identifying their killing characteristics, three strains were selected from the isolated algicidal bacteria. The density of algicidal bacteria kept changing in the range of
. The density flux of algicidal bacteria coincided with that of chlorophyll-a by a week of lag time. Three algicidal bacteria isolated from field strains, H519S5-4, H605S5-15 and H605S5-22, were investigated in nine microalgal species, Heterosigma akashiwo, Chattonella sp. (Raphidlphyceae), Gymnodinium catenatum, Gyrodinium impudicum, Cochlodinium polyklikoides (Dinophyceae), Chaetoceros sp., Coscinodiscus granii, Ditylum brightwellii, Thalassiosira rotula (Bacillariophyceae). Strain H605S5-22 showed a wide algicidal activities over nine microlgae, strain H605S5-15 over H. akashiwo, G. catenatum, T. rotula, Chattonella sp. and strain H519S5-4 over H. akashiwo, Chattonella sp., Chaetoceros sp., G. catenatum. The activities of the three strains were detected by the secretion of algicidal substances. Therefore, it is suggested that the activities of algicidal bacteria have a significant influence over the population dynamics of phytoplankton and get involved with the sharp decrease in red tides in the coastal area.
Comparison of Topex/poseidon Sea Surface Heights with Tide Gauge Sea Levels in the South Indian Ocean
YOON Hong-Joo ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 368~373
Topex/Poseidon sea surface heights are compared to tide gauge sea levels in the South Indian Ocean in the period of January 1993 to December 1995. A user's handbook (AVISO) for processing sea surface height data was used in this study. Topex/Poseidon sea surface heights were obtained from satellite data at the proximity of tide gauge stations. These data were reproduced by a linear interpolation with the interval of 10 days and were processed by the Gaussian filter with a 60-day window. The tide gauge sea levels were obtained in the same manner as the satellite data. The main results on RMS (Root-Mean-Square) and CORR (CORRelation coefficient) in our study were shown as follows: 1) on the characteristics between two data (in-situ and model data), the results (RMS=2.96 cm & CORR=
in the Amsterdam plateau, and RMS=3.45 cm & CORR=
in the Crozet plateau) of the comparison of Topex/Poseidon sea surface heights with tide gauge sea levels, which was calculated by in-situ data of obsewed station showed generally low values in RMS and high values in CORR against to the results (RMS=4.69 cm & CORR=
in the Amsterdam plateau, and RMS= 6.29 cm & CORR=
in the Crozet plateau) of the comparison of Topex/Poseidon sea surface heights with tide gauge sea levels, which was calculated by model data of ECMWF (European Center for Medium-range Weather Forecasting), and 2) on the characteristics between two areas (Kerguelen plateau and island), the results (RMS=3.28 cm & CORR=
in the Kerguelen plateau) of open sea area showed low values in RMS and high values in CORR against to the results (RMS= 5.71 cm & CORR=
in the Kerguelen island) of coast area, respectively.
Benthic Marine Algal Flora and Community Structure of Yongho-dong Area in Pusan, Korea
NAM Ki Wan ; KIM Young Sik ;
Korean Journal of Fisheries and Aquatic Sciences, volume 32, issue 3, 1999, Pages 374~384
Benthic marine algal flora and community structure of Yongho-dong area in Pusan, Korea were investigated seasonally in intertidal and subtidal zones by a quadrat method along 5 transect lines from July 1996 to April 1997. In this area, a total of 99 species including 3 blue-green, 13 green, 26 brown and 57 red algae was found. Among them, 33 taxa, together with dominant Ulva pertusa and Corallina pilulifera, occurred throughout the year. Enteromorpha spp. and Ulva spp. vertically distributed in upper and middle zone, while Simphyocladia latiuscula, Chondria crassicaulis, Corallina pilulifera and Sargassum sup. in lower zones. Biomass per unit area exhibited a wide range of variation, from 1,241 g/
(spring) to 1,648 g/
(summer) in fresh weight. Maximum and minimum species diversity were recorded in spring and autumn, respectively. Results of the UPGAM cluster analysis suggest that the examined 5 sites can be divided into two groups, sites exposed to open sea (transects 1, 2, 3) and comparatively sheltered sites (transects 4, 5) faced with the Pusan Harbor. The former group is represented by large brown algae, Sargassum and Hizikia, while Ulva pertusa and Lomentaria species are mainly found in the latter group. A calcareous alga, Corallina pilulifera occurred dominantly in both groups throughout the year. In conclusion, number of species in this area was remarkably reduced as compared to the previous data. This result may suggest probably more change of algal vegetation in future, considering the physical and chemical pollutions loaded in the coastal marine environment of this area.