Prevalence and infection intensity of the ovarian parasite Marteilioides chungmuensis during an annual reproductive cycle of the oyster Crassostrea gigas
نویسندگان
چکیده
منابع مشابه
Survey on the Ovarian Parasite, Marteilioides chungmuensis in the Cultured Pacific Oyster, Crassostrea gigas in Korea
In Korea, oyster culture began in the early 1900’s. Commercial oyster culture using the hanging system started in the 1960’s, on the southern coast. After the 1960’s, production of cultured oysters has increased every year to the late 1980’s with the highest production recorded at 288,078 metric tons in 1987. This upward trend stagnated in the 1990’s and production dropped to 174,117 metric ton...
متن کاملIsolation and 18S ribosomal DNA gene sequences of Marteilioides chungmuensis (Paramyxea), an ovarian parasite of the Pacific oyster Crassostrea gigas.
To develop sensitive detection techniques with the aim of elucidating the life cycle of Marteilioides chungmuensis, an intracellular paramyxean infecting the ovary of the Pacific oyster Crassostrea gigas, we isolated the parasite at the sporont stage from infected oysters using a freeze-thaw procedure at -20 degrees C and differential centrifugations in discontinuous sucrose and Percoll gradien...
متن کاملSeasonality in the infection and invasion of Marteilioides chungmuensis in the Pacific oyster Crassostrea gigas.
The protozoan parasite Marteilioides chungmuensis causes irregular enlargement of the ovary in the Pacific oyster Crassostrea gigas. The parasite invades the oyster through the epithelial tissue of the labial palp, replicates in the connective tissue, and then moves to the gonad, producing spores inside the oocytes. In this study the seasonality and invasion period of the parasite into the host...
متن کاملNon-specific Defensive Factors of the Pacific Oyster Crassostrea gigas against Infection with Marteilioides chungmuensis: A Flow-Cytometric Study
In order to assess changes in the activity of immunecompetency present in Crassostrea gigas infected with Marteilioides chungmuensis (Protozoa), the total hemocyte counts (THC), hemocyte populations, hemocyte viability, and phagocytosis rate were measured in oysters using flow cytometry. THC were increased significantly in oysters infected with M. chungmuensis relative to the healthy appearing ...
متن کاملGonadal changes and serum steriod levels during the annual reproductive cycle of the pearl oyster Pinctada fucata gould
The annual reproductive cycle of peal oyster Pinctada fucata was characteised by documenting gonadal development and changes in serum levels of estradiol-17b (E2), testosterone (T) and progesterone (P) in the wild bivalve caught in natural beds in the Persian Gulf throughout the year. Bivalve populations employed in this study spawn in June-July and November-December. The pearl oysters had grou...
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ژورنال
عنوان ژورنال: Diseases of Aquatic Organisms
سال: 2003
ISSN: 0177-5103,1616-1580
DOI: 10.3354/dao056259