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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The Korean Journal of Malacology
Journal Basic Information
Journal DOI :
The Malacological Society of Korea
Editor in Chief :
Volume & Issues
Volume 27, Issue 4 - Dec 2011
Volume 27, Issue 3 - Sep 2011
Volume 27, Issue 2 - Jun 2011
Volume 27, Issue 1 - Mar 2011
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Age and Growth of the Short Necked Ruditapes philippinarum on the South Coast of Korea
Yoon, Ho-Seop ; An, Yun-Keun ; Kim, Sun-Tak ; Choi, Sang-Duk ;
The Korean Journal of Malacology, volume 27, issue 1, 2011, Pages 1~7
DOI : 10.9710/kjm.2011.27.1.001
Age and growth of the short-necked, Ruditapes philippinarum were collected from Goheung coast in Korea. Relative growth equations among SL, SH, SW and TW of Ruditapes philippinarum were ranged from 0.8059 to 0.8859. The ring radius were estimated from a von Bertalanffy method with the values of
. Back calculated total weight at the formation of annual ring on the shell of Ruditapes philippinarum with the values
= 4.62 g,
= 5.84 g,
= 6.71 g,
= 7.50 g,
= 8.14 g. Growth curves for shell height and total weight fitted to the von Bertalanffy equation were expressed as:
Digestive Enzyme Activity within Crystalline Style in Three Species of Bivalves
Ju, Sun-Mi ; Kwon, O-Nam ; Kim, Jae-Won ; Lee, Jung-Sick ;
The Korean Journal of Malacology, volume 27, issue 1, 2011, Pages 9~14
DOI : 10.9710/kjm.2011.27.1.009
This study was examined digestive enzyme activity in the crystalline style of the three species of bivalves. Bivalves used in this study were Tegillarca granosa (n=61), Mytilus galloprovincialis (n=30) and Saxidomus purpuratus (n=30) and collected from southern coast of Korea on May 2010. Digestive enzymes activities in the crystalline style were assayed in spectrophotometer. Amylase and cellulase occupied approximately 90% of digestive enzyme in crystalline style of T. granosa, M. galloprovincialis, and S. purpuratus. And protease activity in crystalline style of T. granosa, M. galloprovincialis and S. purpuratus showed the lowest values to 0.02, 0 and 0.08%, respectively. Digestive enzyme activity in crystalline style of three species was measured in the order of cellulase > amylase > chitinase > laminarinase.
Fine Structure and Histopathological Changes Exposed to Acute High Salinity of the Gill of Japanese Clam, Corbicula japonica
Park, Jung-Jun ; Lee, Jung-Sick ; Lee, Jae-Seong ;
The Korean Journal of Malacology, volume 27, issue 1, 2011, Pages 15~27
DOI : 10.9710/kjm.2011.27.1.015
This study was performed to observe ultrastructure of the gill and to ascertain the effect of salinity on histopathological and ultrastructural changes in the gill of the Japanese clam, Corbicula japonica. Experimental period was 7 days. Experimental groups consisted of control, 5, 10, 20 psu.
(96 h.) by the probit was 19.55 psu. Mortality was significantly different from the control (p < 0.05). Inner demibranch of the gill of C. japonica was wider 1.37 times than outer demibranch (p < 0.001). The filament zone on the plica can be distinguished by the six epithelial celll cell; frontal ciliated epithelium (
), latero-frontal ciliated epithelium (
), postlatero-frontal epithelim (
), and lateral ciliated epithelium (
) in the frontal zone, endothelial cellin the intermediate zone, and abfrontal cell in the abfrontal zone. It had one type of secretory cell that was filled with fibrous substances of low electron density. The gill of C. japonica exposed to 5 psu for 7 days was observed partially disappearance of the cilia, and glycogen granule in the filament. In the 10 psu, gill appeared partially modification of epithelial cell and destruction of the glycocalyx. Gill exposed to 20 psu was extended nuclus of the ciliated epithelial cell, destruction of the organelles, and observed glycogen granules infiltration and numerous vacuoles. Moreover, more than 50% filaments were observed that come out chitinous rod from disappearance of epithelial cell in the filament. Therefore, the destruction of the cilia and epithelial cell induce physiological activity and it may be leading directly to death.
Recruitment patterns of sessile organisms on the artificial PVC panels in Jangmok Bay, southern coast of Korea
Choi, Jin-Woo ; Park, So-Hyun ; Seo, Jin-Young ;
The Korean Journal of Malacology, volume 27, issue 1, 2011, Pages 29~33
DOI : 10.9710/kjm.2011.27.1.029
This study was conducted to investigate the recruitment pattern of sessile organisms on the artificial substrates of PVC in Jangmok Bay, Geoje Island, southern coast of Korea. Five PVC plates were submerged from March to October, 2007 at one month interval, and two plates were retrieved after one month. The dominant recruiters were a green algae, Entermorpha prolifera in March, Mytilus galloprovincialis in April, M. galloprovincialis and Styela plicata in May, S. plicata and Bugula sp. in June. During August, Balanus amphtrite and anthozoans were dominant recruiters, and a serpulid worm, Hydroides ezoensis in October. There was a clear specific recruiting period of sessile faunas depending on their reproduction cycles in a sheltered embayment like Jangmok Bay.
Effect of Polycyclic Aromatic Hydrocarbon (PAH) on Shell Repair in the Pacific oyster, Crassostrea gigas
Cho, Sang-Man ; Lee, You-Me ; Jeong, Woo-Geon ;
The Korean Journal of Malacology, volume 27, issue 1, 2011, Pages 35~42
DOI : 10.9710/kjm.2011.27.1.035
In order to understand effect of polycyclic aromatic hydrocarbon (PAH) on shell repair of the Pacific oyster, Crassostrea gigas, shell regeneration experiments were carried out using oysters drilled a hole on the right valve. The change of pH and hemocytic characteristics in both extrapallial fluid and hemolymph were observed during the shell repair. The thickness of mantle tissue was apparently decreased, while necrosis in epithelium and periostracal gland was increased in response to PAH exposure. Our finding suggested that PAH could adversely influence on shell repair.
Gametogenic Cycle and the Spawning Season by Quantitative Statistical Analysis and the Biological Minimum Size of Cyclina sinensis in Western Korea
Chung, Ee-Yung ; Lee, Chang-Hoon ; Park, Young-Je ; Choi, Moon-Sul ; Lee, Ki-Young ; Ryu, Dong-Ki ;
The Korean Journal of Malacology, volume 27, issue 1, 2011, Pages 43~53
DOI : 10.9710/kjm.2011.27.1.043
The gametogenic cycle and the spawning season in female and male Cyclina sinensis were investigated by quantitative statistical analysis using an image analyzer system, and the biological minimum size (the size at 50% of sexual maturity) was calculated by combination of quantitative data by size and von Bertalanffy's equation. Compared the gametogenic cycle by quantitative statistical analysis with the previous qualitative results in female and male C. sinensis, monthly changes in female and male gametogenic cycles calculated by quantitative statistical analysis showed similar patterns to the gonadal stages in female and male reproductive cycles by qualitative histological analysis. Comparisons of monthly changes in the portions (%) of each area to eight kinds of areas by quantitative statistical analysis in the gonads in female and male C. sinensis are as follows. Monthly changes in the portions (%) of the ovary areas to total tissue areas in females and also monthly changes in the portions of the testis areas to total tissue areas in males increased in March and reached the maximum in May, and then showed a rapid decrease from June to October. Monthly changes in the portions (%) of oocyte areas to ovarian tissue areas in females and also monthly changes in the portions of the areas of the spermatogenic stages to testis areas in males began to increase in March and reached the maximum in June in females and males, and then rapidly dropped from July to October in females and males when spawnig occurred. From these data, it is apparent that the number of spawning seasons in female and male C. sinensis occurred once per year, from July to October. Monthly changes in the number of the oocytes per mm2 and in the mean diameter of the oocyte in captured image which were calculated for each female slide showed a maximum in May and reached the minimum from December to February. Therefore, C. sinensis in both sexes showed a unimodal gametogenic cycle during the year. The percentage of sexual maturity of female and male clams ranging from 25.1 to 30.0 mm in length was over 50% and 100% for clams over 40.1 mm length. In this study, the biological minimum size (sexually mature shell lengths at 50% of sexual maturity) in females and males were 26.85 and 26.28 mm, respectively.
Germ cell Differentiation During Spermatogenesis, and Ultrastructural Characteristics of Mature Sperm in Male Phacosoma japonicus (Bivalvia: Veneridae)
Kim, Jin-Hee ; Chung, Ee-Yung ; Choi, Moon-Sul ; Lee, Ki-Young ; Lee, IL-Ho ; Seo, Won-Jae ;
The Korean Journal of Malacology, volume 27, issue 1, 2011, Pages 55~65
DOI : 10.9710/kjm.2011.27.1.055
Some characteristics of germ cell differntiations during spermiogenesis and mature sperm ultrastructure in male Phacosoma japonicus were investigated by transmission electron microscope observations. The morphology of the spermatozoon of this species has a primitive type and is similar to those of other species in the subclass Heterodonta. Morphologies of the sperm nucleus and the acrosome of this species are the cylindrical type and cap shape, respectively. The spermatozoon is approximately 45-50
in length, including a long curved sperm nucleus (about
long with 45
of the angle of the nucleus, an acrosome (about
in length), and tail flagellum (about 42-
)The axoneme of the sperm tail shows a 9+2 structure. As some characteristics of the acrosomal vesicle structures, the basal and lateral parts of basal rings show electron opaque part (region), while the anterior apex part of the acrosomal vesicle shows electron lucent part (region). These characteristics of the acrosomal vesicle were found in the family Veneridae and other several families in the subclass Heterodonta. These common characteristics of the acrosomal vesicle in the subclass Heterodonta can be used for phylogenetic and systematic analysis as a taxonomic key or a significant tool. The number of mitochondria in the sperm midpiece of this species are four, as one of common characteristics appear in most species in the family Veneridae and other families in the subclass Heterodonta. However, exceptionally, only three species in Veneridae of the subclass Heterodonta contain 5 mitochondria. The number of mitochondria in the sperm midpiece can be used for the taxonomic analysis of the family or superfamily levels as a systematic key or tools.
New Record of Columbarium pagoda pagoda (Lesson, 1834, Gastropoda, Turbinellidae) in Korean water
Lee, Yong-Seok ; Lee, Jun-Sang ;
The Korean Journal of Malacology, volume 27, issue 1, 2011, Pages 67~68
DOI : 10.9710/kjm.2011.27.1.067
The Turbinellidae shell Columbarium pagoda pagoda (Lesson, 1834), from the southern coast of Korea was recorded as new to the Korean molluscan fauna. The shell is typically solid and fusiform, with a well elongated spire and long anterior canal, and keel with a row developed spine. The protoconch is small, planorboid to depressed dome-shaped. The family Turbinellidae is reported from Korea for the first time.
Gill Ultrastructure of the Spiny Top Shell, Batillus cornutus (Gastropoda: Turbinidae)
Jung, Gui-Kwon ; Park, Jung-Jun ; Ju, Sun-Mi ; Jeon, Mi-Ae ; Lee, Jung-Sick ;
The Korean Journal of Malacology, volume 27, issue 1, 2011, Pages 69~76
DOI : 10.9710/kjm.2011.27.1.069
Gill morphology and ultrastructure of the spiny top shell, Batillus cornutus were described using light and electron microscopy (SEM and TEM). The spiny top shell, Batillus cornutus has bipectinate gill. The epithelial layer of gill filament was simple and composed of columnar epithelium, ciliated cell, mitochondria-rich cell and secretory cell. Microvilli were well-developed on the free surface of columnar epithelial cell. The epithelial cells are connected to the neighboring cells with intercelluar junctions at the apico-lateral surface. The cilia and microvilli were commonly observed on the free surface of ciliated cell. Tubular mitochondria appeared in the apical cytoplasm, and connected ciliary rootlet. Mitochondria-rich cells contained a oval-shaped nucleus in the basal area. And majority of cytoplasm was occupied by well-developed mitochondria. Result of AB-PAS (pH 2.5) and AF-AB reaction showed that secretory cells contained mainly acidic carboxylated mucosubstances. Secretory cells are unicellular glands and can be divided into four types (A, B, C and D) depending on the cell shape and ultrastructure of secretory granules.
A study on the effects of an artificial oil-spill on the ultrastructural changes in the digestive glands of Crassostrea gigas
Jun, Je-Cheon ; Kang, Se-Won ; Baek, Moon-Ki ; Jeong, Ji-Eun ; Shin, Yun-Kyung ; Park, Young-Je ; Han, Yeon-Soo ; Lee, Yong-Seok ;
The Korean Journal of Malacology, volume 27, issue 1, 2011, Pages 77~86
DOI : 10.9710/kjm.2011.27.1.077
The unwanted artificial oil-spill has severely contaminated the coastal environment in the world. Level of contamination has so far been monitered by various indicator species including mussel, oysters, flounder, and cockle. In this study, we decided to use the oyster as a model organism to observe the morphological changes being exposed to the artificial oil-spill in the coastal areas in Taean, Korea. The oysters were collected from four local sites (Sindu-ri, Uiwang-ri, Jonghyeon-dong, Ansan and Uihang-ri) exposed to various levels of pollution after an oil spill in Taean. Microscopic analysis of the hepatopancreatic microstructure in the digestive gland from the collected oysters show that the swelling, whorl, and destruction phenomenon of the nuclear membrane, a well-known microstructure induced by heavy metal exposure, was observed. Nuclear body (Nb), another typical characteristic of contamination or infection were also observed in some samples. Necrosis was observed in tissue samples collected from the area with a high degree of oil pollution. In addition, parasite-like particles (virus, perkinsus) were observed in most samples. Taken together, these results suggest that oil contamination in the oyster habitats influences the cytopathological changes in Crassostrea gigas.