Search

Your search keyword '"Lee, Jung Sick"' showing total 226 results
Start Over Author "Lee, Jung Sick"
226 results on '"Lee, Jung Sick"'

9. IMPLICATIONS FOR FISHERIES MANAGEMENT: SEX RATIO, SIZE AT SEXUAL MATURITY, AND REPRODUCTIVE CYCLE OF SAXIDOMUS PURPURATUS (BIVALVIA: VENERIDAE) IN KOREA

Author

Kim, Hyejin, Kim, Yeonghye, Park, Jung Jun, Jeon, Mi Ae, Lee, Yeon Gyu, and Lee, Jung Sick

Subjects
Veneridae -- Observations, Clam fisheries -- Observations, Fishery research, Biological sciences, Zoology and wildlife conservation
Abstract

This study was performed to obtain information on the sex ratio, size at sexual maturity, and main spawning period of the butter clam Saxidomus purpuratus in Korea to contribute to the management of fisheries resources of this species. The age-specific sex ratios (female:male) of S. purpuratus were 1:2.20 (31.3% female) and 1:1.03 (49.2% female) in the 0+and 1+y classes, respectively, illustrating the initially higher percentage of males in the butter clam population. From the 2+ y class onward, however, the percentage of females in the population tended to increase with age. The shell length at sexual maturity was analyzed using a logistic regression model, and was determined to be 54.5 and 45.5 mm for females and males, respectively. The gonad index displayed a definitive pattern of seasonal changes, with high values in the spring and fall and low values in the summer and winter for both males and females. The butter clam S. purpuratus was found to have two spawning seasons per year, with the main spawning period being in May-June.KEY WORDS: sex ratio, size at sexual maturity, reproductive cycle, Saxidomus purpuratus, INTRODUCTIONStudies on the reproduction of marine animals can provide information on basic biology of use in the preservation of biological resources, development of aquaculture technology, and fisheries management. These studies [...]

Published
2018
Full Text
View/download PDF

15. Gonadal development and reproductive cycle of cultured abalone, Haliotis discus hannai (Gastropoda: Haliotidae) in Korea: implications for seed production

Author

Kim, Hyejin, Kim, Byeong Hak, Son, Maeng Hyun, Jeon, Mi Ae, Lee, Yeon Gyu, and Lee, Jung Sick

Subjects
Gonads -- Growth, Abalones -- Growth, Sexual cycle -- Physiological aspects, Shellfish culture -- Methods, Company growth, Biological sciences, Zoology and wildlife conservation
Abstract

ABSTRACT The objective of this study was to examine gonad development and reproductive cycle of the abalone Haliotis discus hannai at three main abalone aquaculture farms (Uljin, Wando, and Jeju [...]

Published
2016
Full Text
View/download PDF

26. Gonadal development and reproductive cycle of the boring Bivalve Barnea davidi (Deshayes, 1874) in Hampyeong Bay, Korea (Bivalvia: Pholadidae)

Author

Jeon, Mi Ae, Park, Min Woo, Ku, Kayeon, Ju, Sun Mi, Ko, Panseok, Kim, Byeong Hak, Myeong, Jeong In, and Lee, Jung Sick

Subjects
Mollusks -- Research -- Growth -- Physiological aspects, Animal development -- Research, Company growth, Biological sciences, Zoology and wildlife conservation
Abstract

ABSTRACT This study describes histologically the reproductive cycle of Barnea davidi inhabiting Hampyeong Bay on the western seashores of Korea. A total of 578 B. davidi, collected from February 2010 [...]

Published
2012
Full Text
View/download PDF

29. Histology and ultrastructure of the mantle epidermis of the equilateral Venus, Gomphina veneriformis (Bivalvia: Veneridae)

Author

Lee, Jung Sick, Joo, Ja Young, and Park, Jung Jun

Subjects
Shells -- Physiological aspects -- Research, Bivalvia -- Physiological aspects -- Research, Ultrastructure (Biology) -- Research -- Physiological aspects
Abstract

ABSTRACT The histochemical characteristics and ultrastructure of the mantle of Gomphina veneriformis, were described using light and electron microscopy. When the mantle was distinguished into marginal, middle, and apical zones, [...]

Published
2007

30. Microscopic anatomy of foot of the spiny top shell, Batillus cornutus (lightfoot, 1786) (Gastropoda: Turbinidae)

Author

Jung, Gui Kwon, Park, Jung Jun, Lee, Jae Woo, and Lee, Jung Sick

Subjects
Transmission electron microscopes -- Usage -- Research -- Physiological aspects, Shellfish -- Research -- Physiological aspects -- Usage, Biological sciences, Zoology and wildlife conservation, Physiological aspects, Usage, Research
Abstract

ABSTRACT Foot structures of the spiny top shell, Batillus cornutus were investigated by light and transmission electron microscopy. The foot was composed of epithelial layer, connective tissue layer, and muscular [...]

Published
2006

35. Effects on the antioxidant and immunological parameters in two species of the abalone, Haliotis discus discus and Haliotis gigantea during thermal stress

Author

Ju-Chan Kang, Lee Jung Sick, Shin Hu Kim, and EunYoung Min

Subjects
biology, Abalone, Gigantea, biology.organism_classification, Haliotis gigantea, Superoxide dismutase, chemistry.chemical_compound, Animal science, chemistry, Catalase, biology.protein, Haliotis discus, Hepatopancreas, Lysozyme
Abstract

A study was conducted to evaluate the effects of elevated water temperature on antioxidant and immunological response in the abalones, Haliotis discus discus and Haliotis gigantea. The abalones were exposed to various water temperature; 20, 21, 22, 24, 26 and 28℃ for 96 hours. After thermal stress for 96 hours, in the control, superoxide dismutase (SOD) activities in hepatopancreas of H. gigantea were higher (1.3 times) than the values in H. discus discus. Although SOD activities showed no significant differences in H. discus discus, the values in H. gigantea were significantly increased in 24℃ or higher compared to the control after 24 hours exposure. Catalase (CAT) activities in hepatopancreas of H. discus discus were higher (1.4 times) than the values of H. gigantea in the control. After thermal stress (≥ 26℃), CAT activities significantly increased in both species compared to the control. The phenoloxidase (PO) activity of hemolymph was decreased in both species exposed to high temperature (≥ 26℃) compared to the control (P < 0.05). The values of lysozyme were significantly decreased in H. discus discus exposed to 28℃, and in H. gigantea to 26℃. In conclusion, in both species, there was a significant increase on antioxidant abilities (CAT) and a decrease on immunological parameters (PO and lysozyme) after thermal stress of 26℃ or higher. Also, antioxidant enzymes, SOD activities significantly increased in H. gigantea, but there was no significance in H. discus discus after thermal stress. These results suggested that H. gigantea is considered to be more sensitive than H. discus discus on thermal stress even though the similar warm current type.

Published
2017

Catalog

Books, media, physical & digital resources
See catalog results