Research articles
ScienceAsia 51 (2023): 1-7 |doi:
10.2306/scienceasia1513-1874.2023.001
Health evaluation of the sexually mature Crassostrea belcheri
(G.B. Sowerby II, 1871) in an enclosed rearing condition
Kattinat Sagulsawasdipana, Supatcha Chooseangjaewb,*, Pahol Kosiyachindac, Natthawut Charoenphond, Sinlapachai Senarate
ABSTRACT: Studies on the health status of a variety of oyster species in aquaculture have been widely reported,
except that of Crassostrea belcheri despite its commercial significance. The quality of the oyster depends greatly only
on the physiological conditions of the broodstock. The present study aimed to evaluate ultrastructures, presence
of apoptotic cells, and other histopathology of sexually mature C. belcheri to provide basic information of this
commercial oyster species. The oyster specimens of each sex were randomly sampled (n = 5) and cultivated under the
aquaculture laboratory and the water quality within acceptable limits for broodstock oyster culture. The specimens were
processed using the histology, ultrastructure, and terminal deoxynucleotidyl transferase (TdT) dUTP Nick-End Labeling
(TUNEL) assay. We demonstrated that the selected organs including gill, mantle, and gonads showed no abnormal
histopathological findings, as commonly found in the oyster histology. No apoptosis was observed in general. The
ultrastructure of gametes appeared normally chartered. However, with high magnifications, brown cells were observed
in the lamina propria of the stomach, indicating that the sampled oysters were under certain physiological stress. Our
findings and reports on the ultrastructure and histopathology of C. belcheri could provide baseline information on health
conditions for aquaculture design and maintenance to pursue higher reproductive success of the oyster in aquaculture
settings.
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| a |
Department of Marine Science and Environment, Faculty of Science and Fisheries Technology,
Rajamangala University of Technology Srivijaya, Trang 92150 Thailand |
| b |
Department of Aquaculture and Fishery Products, Faculty of Science and Fisheries Technology,
Rajamangala University of Technology Srivijaya, Trang 92150 Thailand |
| c |
Department of Biology, Faculty of Science, Mahidol University, Bangkok 10400 Thailand |
| d |
Department of Anatomy, Faculty of Medical Science, Naresuan University, Phitsanulok 65000 Thailand |
| e |
Division of Biological Sciences, Faculty of Science, Prince of Songkla University, Songkhla 90110 Thailand |
* Corresponding author, E-mail: Supatcha.c@rmutsv.ac.th
Received 31 Mar 2024, Accepted 29 Sep 2024
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