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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 24, Issue 3 - Dec 2008
Volume 24, Issue 2 - Aug 2008
Volume 24, Issue 1 - May 2008
Selecting the target year
Reproductive Biology of Common Octopus, Octopus vulgaris in the South Sea of Korea
Kim, Yeong-Hye ; Kang, Hyun-Jung ; Lee, Eun-Hui ; Lee, Dong-Woo ; Chang, Dae-Soo ; Gwak, Woo-Seok ;
The Korean Journal of Malacology, volume 24, issue 3, 2008, Pages 161~166
Samples were collected monthly from coastal water around Tongyeong and Sacheon in Gyeongsangnam-do, Korea, using traps. A total of 748 Octopus vulgaris were sampled from February 2007 to January 2008. Monthly changes of maturity stages and sex ratio of the common octopus were observed. Mean biomass (total wet weight) of the female specimens ranged from 129.8 to 3,381.4 g and that of the male specimens ranged from 128.6 and 2,378.4 g. The spawning periods were May to June and September. The fecundity ranged from 5,715 eggs at 252.0 g to 240,990 eggs at 3,381.4 g of total wet weight. The relationship between total wet weight (TW) and fecundity (F) was F = 26.539
) and fecundity increased with total wet weight. Sex ratio was not significantly different from the 1:1 (p > 0.05).
Effect of Water Temperature, Salinity and Food on Survival Rate and Growth of the Bladder Moon, Glossaulax didyma didyma (Gastropoda: Naticidae)
Hwang, Kyu ; Ryu, Dong-Ki ;
The Korean Journal of Malacology, volume 24, issue 3, 2008, Pages 167~173
The survival and growth of Glossaulax didyma didyma (
) were measured in the laboratory under controlled conditions, such as water temperature, salinity and diet. The effect of temperature on G. didyma didyma was examined at four different levels (15, 20, 25 and
) with 30 psu for 30 days. The results show that the growth and survival rates of G. didyma didyma were significantly higher at
than at other temperatures. The effect of salinity on G. didyma didyma was also examined at six different levels (10, 15, 20, 25, 30 and 35 psu) in
for 40 days. The results showed that the growth and survival rates of G. didyma didyma were significantly higher at 30 psu and 35 psu than at other salinities. Finally, the effect of diets on G. didyma didyma was examined with three single-component diets (prawn, shellfish and fish) at
and 30 psu for 60 days. The results showed that the growth and survival rates of G. didyma didyma fed on shellfish were significantly higher than those fed on prawn and fish.
The Influence of Water Temperature and Salinity on Filtration Rates of the Hard Clam, Meretrix petechialis
Lim, Kyeong-Hun ; Jang, Kyu-Sang ; Kim, In-Sou ; Lee, Jeong-Ho ; Shin, Hyun-Chool ;
The Korean Journal of Malacology, volume 24, issue 3, 2008, Pages 175~188
This study was performed to describe the influence of water temperature and salinity on the filtration rate of the hard clam, Meretrix petechialis. The filtration rates of hard clams showed significant differences depending on both water temperature and age group (two-way ANOVA, p < 0.001). The filtration rate of all the hard clams, aged from 1 to 4 years, was generally reduced in low temperature range (
). As the water temperature increased, the filtration rate increased exponentially. The filtration rate was relatively high in
water temperature range, but rapidly decreased again at around
. Variations in the data for filtration rates of hard clams, relative to age and changing water temperature, were used to determine the temperature coefficient
in each water temperature range. In
temperature range, every age group showed the highest
figure. It was found that on the whole, the higher the water temperature was, the lower the number of
was. Regardless of age, the number of
was higher in the lower water temperature range. In
temperature range, the number of
was less than 1.00 in all age groups, implying that this is the range in which the filtration rate decreased. Variations in the filtration rate also showed very clear differences (two-way ANOVA, p < 0.001) according to changing salinity and age. All the age groups, from 1 to 4 year olds, showed low filtration rates at both low salinity (10-15 psu) and high salinity (40 psu). The highest filtration rate was recorded at 30 psu, and relatively high filtration rates were found around 30 psu. However, the Student-Newman-Keuls post hoc multiple comparison test found that the hard clams in the 1-year group showed high filtration rates in a relatively narrower salinity range compared to those in the 2, 3, and 4 year groups. In other words, hard clams in the 2, 3, and 4 year groups showed high filtration rates at higher levels of salinity.
Ecologically Sustainable Management of Short-necked Clam, Ruditapes philippinarum, on the Coast of Yeongi at Tongyeong, Korea
Cho, Sang-Man ; Jeong, Woo-Geon ; Lee, Sang-Jun ;
The Korean Journal of Malacology, volume 24, issue 3, 2008, Pages 189~197
In order to develop the sustainable ecological management, short-necked clams, Ruditapes philippinarum, were collected from Yoengi coast in Tongyoeng, Korea. The growth of the clam was estimated as:
from ring radius composition of shell. Instantaneous co-efficiency of total mortality and natural mortality were calculated as: 0.991/year and 0.494/year, respectively. The age of the clams from the first capture was estimated to be 3.28. The total biomass was estimated to be 212 MT in the fisheries area (6.4 ha). Applied by these parameters, the annual recruit biomass and the current yield per recruit were calculated to be 649.5 individual/
, respectively. The current fishing intensity was much lower for maximum sustainable yield and acceptable biological catch. Although higher yield per recruit could be achieved by increasing fishing intensity, it is favorable to retain the current fishing intensity because of the unique fishing attitude on Yeongi coast in Tongyoeng, Korea.
Report of Additional Molluscan Species from Rocky Inter- and Subtidal Area of Dokdo Island, Korea
Hong, Byung-Kyu ; Son, Min-Ho ; Seo, In-Soo ; Kim, Mi-Hyang ; Lee, Hae-Won ; Choi, Young-Min ; Chun, Yong-Yull ;
The Korean Journal of Malacology, volume 24, issue 3, 2008, Pages 199~203
Thirty one marine molluscan species were added to the malacofauna of Dokdo Island, Korea based on the samples collected from April 2006 to August 2008 with SCUBA diving. As a result, one hundred six marine molluscan species were recorded from Dokdo Island hitherto.
Preliminary Studies on the Growth Performance of the Subtrophic Noble Scallop Chlamys nobilis in Korean Waters - with a Special Focus on Nursery Life
Won, Seung-Hwan ; Jo, Q-Tae ; Han, Seock-Jung ; Kim, Jae-Woo ;
The Korean Journal of Malacology, volume 24, issue 3, 2008, Pages 205~214
To evaluate the aquaculture potential of a subtrophic noble scallop, Chlamys nobilis in Korean waters, nursery growth of the species was studied on two remote Jeju coasts, Jigwido and Ongpori. The early growth performance of the first 60 days after settlement was expressed as:
), where x stands for days after settlement and SL for shell length. The early spats sized 1 mm in average shell length became
after a month of nursery culture, thereafter grew to
for consecutive 4 months in Jigwido coastal area. Mean growth gains (mean daily gains in parenthesis) were
), in depths of 5, 10, 15, and 20 m, respectively. The growth rate was significantly decreased as cultured in deeper place (p < 0.05). As culturing density was higher, growth performance of the scallop was decreased in both locations. Overall, in our preliminary study, the growth performance of scallop in Korean waters was not better than that in Japan, but it seems to be worth doing further study for successful introduction to Korean waters.
Characteristics of Ocean Environmental Factors and Community Structure of Macrobenthos around Munseom, Jeju Island, Korea
Ko, Joon-Chul ; Koo, Jun-Ho ; Yang, Moon-Ho ;
The Korean Journal of Malacology, volume 24, issue 3, 2008, Pages 215~228
This study was performed to find out the community structure of macrobenthos and the environmental factors around Munseom coastal water in Jeju Island from June to December, 2007. Mean temperature and mean salinity were
and 34.03 psu, indicating stable water masses. Concentrations of DO, COD and SS were as low as those in the standard sea-water-quality classes I. Chlorophyll a concentrations ranged from 0.40 to 1.09 mg/L (mean, 0.69 mg/L), and higher concentration was observed in December rather than in June due to a blooming in winter. The mean concentration (their ranges are in parentheses) of nitrate, phosphate, and silicate were 0.15 mg/L (0.073-0.264 mg/L), 0.01 mg/L (0.004-0.011 mg/L) and 0.23 mg/L (0.039-0.464 mg/L), respectively. The values were higher near the Munseom due to influxes from the land. Of the 112 species that were identified, 40 species (36.0%) were Mollusca; 33 (28.8%) were Cnidaria; 13 (11.7%) were Porifera; 8 (7.2%) were Arthropoda and 17 species (15.3%) were others including Echinodermata. Density and biomass were estimated to be 4,340 individual/
respectively. Anthozoa was the most dominant group in abundance (
) as well as in the number of species, whereas Cnidaria was predominant in biomass (
). The dominant species were Dendronephthya gigantea, Scleronephthya gracillimum, Anthoplexaura dimorpha, Dendronephthya castanea, Thecocarpus niger, Dendronephthya spinulosa, Dendronephthya putteri, and Acabaria bicolor in the depth of 10-30 m. The seasonal variations of the number of individual and biomass of Cnidaria and Mollusca were observed. There was a slow increment in June, a decrement in October, and a drastic increasing in December. The biodiversity, evenness and richness index in surveyed stations were 2.715-3.413 (H'), 0.758-0.851(E'), and 5.202-8.720 (R) respectively. The dominance index was the highest in station M2 and the lowest in station M1.
Tributyltin Chloride (TBTCl) Toxicity on the Growth and Mantle Structure of the Equilateral Venus, Gomphina veneriformis (Bivalvia: Veneridae)
Park, Jung-Jun ; Lee, Jung-Sick ;
The Korean Journal of Malacology, volume 24, issue 3, 2008, Pages 229~241
Changes of growth and histopathological feature in the mantle structure of the equilateral venus, Gomphina veneriformis exposed to tribultyltin chloride (TBTCl) for 36 weeks were observed. Concentrations of TBTCl were 0, 0.4, 0.6, and
. A regression analysis by power function of SPSS was shown that the growth of experimental groups was significantly decreased after 12 weeks of exposure. For histological analysis, mantle tissues were characterized using H-E stain, AB-PAS (pH 2.5) reaction and Masson's trichrome stain, and epidermal layer thickness and mucous cell distribution were analysed using the image analyser. The mantle had 4-folds (inner-inner, inner-outer, middle, and outer) and its epidermal layer consisted of simple epithlia. A periostracum was observed in the periostracal groove between middle and outer fold. Inner epidermal layer consisted of simple ciliated columnar epithelia, but the outer epidermal layer consisted of simple non-ciliated columnar epithelia. Alcian blue positive mucous cells showed blue color (7462c, 653c) in the inner fold, violet color (2583c) in the middle fold, and blue color (647c, 7455c) in inner epidermal layer (numbers in the parenthesis are codes of Pantone process coated color). Hemolymph sinus in the mantle was extended, and mucous cells in inner plica of the middle fold were stained as blue (7455c) and violet (2587c), after 12 weeks of TBTCI exposure. Cilia and striated border were disappeared, and number of mucous cells in the inner epidermal layer was reduced. Serious histopathological changes in middle and outer fold near the periostracum were observed after 36 weeks. Moreover, epidermal layer thickness and mucous cell distribution were showed decreasing tendency as exposure time to TBTCI was increased. Results of this study suggested that TBTCl induced growth disorder with histopathological changes.
UV-Vis and ED-XRF Analyses of Natural Black Colored Pearls from Freshwater Cultured Shells
Kim, Hea-Yeon ; Park, Jong-Wan ;
The Korean Journal of Malacology, volume 24, issue 3, 2008, Pages 243~251
Analyses of UV-Vis spectrum and reflectance are useful tools to identify pearls of which color was naturally made or chemically changed. Contents of some trace elements of pearls by using ED-XRF may give us the information that the pearls were originated from marine shells or freshwater shells, and may give us whether the pearls were chemically treated or not. Three types of chemically untreated pearls, freshwater cultured, Akoya cultured and Tahitian cultured, were treated with silver nitrate. UV-Vis absorbance spectrum of Ag was changed after treatment, and reflectance of pearls was decreased. Absorbance of natural black colored Tahitian cultured pearls at 400, 500 and 700 nm was observed. Natural black colored freshwater cultured pearls showed two characteristic absorption patterns in UV-Vis spectra at 380-400, 480-500 nm. Unlike naturally black colored Tahitian cultured pearls, the absorption spectrum at 700 nm could not be found from black freshwater cultured pearls. Manganese was not detected in the pearls from marine shells, and strontium content of the pearls from marine cultured shells was higher than that from freshwater cultured shells. According to ED-XRF analysis, Ag contents of silver nitrate treated pearls increased as more time passed, because silver ion invaded to nacre layer of the pearls. Since Ag content of the black pearls known as untreated ranged under 0.1%, analysis of Ag content may used to distinguish the black pearls are treated or not in marketplace.
Factors Affecting Concentration of Polycyclic Aromatic Hydrocarbons in Oyster, Laver and Rockfish
Kim, Kang-Jeon ; Choi, Sang-Hoon ; Park, Kwan-Ha ;
The Korean Journal of Malacology, volume 24, issue 3, 2008, Pages 253~260
A total of 15 different residues of polycyclic aromatic hydrocarbons (PAHs) in each 20 samples of Pacific oysters, dried laver and rockfish obtained from seafood markets were analyzed. The prevalence of samples in which more than one PAH residues were found was 75% in oyster, 35% in rock fish hepatopancreas, 0% in rockfish muscle and laver, respectively. To estimate factors contributing to this residue level difference among organisms, tissue concentrations were analyzed after exposing three organisms to phenanthrene, a representative PAH, with concentration of 0.01 or
for 2 weeks. Phenanthrene levels after exposure were higher in the oyster digestive gland, laver and rockfish hepatopancreas, but were lower in the oyster whole meat or rockfish muscle. This finding disproved that any close relationship between the residue difference of market samples and concentrating properties of PAHs. The second possible factor analyzed was total lipid contents in the three organisms. Although higher lipid level in hepatopancreas of rockfish may contribute accumulation of PAH residues in the rockfish, lipid factor did not affect to PAH levels in other organism samples. Activity of 7-ethyoxyresorufin-O-deethylase (EROD), a kind of cytochrome
enzyme, was measured to evaluate the eliminated amount of PAHs through metabolism. The higher EROD activity in rockfish, compared to that in oyster, was likely to contribute to the lower PAH residues in the rockfish. More factors, such as different exposure history, organisms' ability to escape, ingestion through prey organisms, and post-harvest loss, should be studied in the future.
Effect of Temperature and Body Size on Oxygen Consumption and Ammonia Excretion of Oyster, Crassostrea gigas
Shin, Yun-Kyung ; Hur, Young-Baek ; Myeong, Jeong-In ; Lee, Sik ;
The Korean Journal of Malacology, volume 24, issue 3, 2008, Pages 261~267
The tendency of metabolism in oyster, Crassostrea gigas, was investigated in relation to the water temperature and salinity. Oxygen consumption and ammonia excretion were measured and O:N ratio were calculated according to the water temperature from February 2007 to September 2008 and body size. The relationship between oxygen consumption and body weight has been examined in C. gigas. The weight-specific oxygen consumption rate (mg
/g/h) varied inversely with size. Oxygen consumption and ammonia excretion increased with an increase in water temperature. O:N ratio measured in this study ranged from 8 to 40 under ordinary sea water and the ratio was 8 at
and 16 at
. This indicates that oyster mainly use the protein as the primary catabolic substrate during gametogenesis. Lower O:N ratio in winter suggests that oysters have to meet their energy demand by metabolizing protein to survive in stressful conditions such as low temperature and lack of sufficient food supply. This studies will provide the basic data for oyster culture farm in assessing the carrying capacity and sustainable management.