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Growth, Reproductive Condition, And Digestive Tubule Atrophy Of Pacific Oyster Crassostrea Gigas In Gamakman Bay Off The Southern Coast Of Korea
Kang, DH Chu, Fu-Lin E. Yang, HS Lee, CH Lee, CH Koh, HB Choi, KS
Kang, DH
Chu, Fu-Lin E.
Yang, HS
Lee, CH
Lee, CH
Koh, HB
Choi, KS
Abstract
Spat of Pacific oysters (Crassostrea gigas) were collected from Gamakman Bay, Korea, and raised in a spat hardening facility located in the low intertidal zone of the bay for a "hardening/stunting" period of 10 mo. Seasonal changes in growth, reproductive condition, and digestive tubule atrophy (DTA) of these "hardened/stunted" oysters were monitored for more than a year after transplanting to a suspended longline system in a grow-out area in the bay. After transplantation, the hardened/stunted oysters showed a logarithmic increase in shell size for the first 4 mo, from June to October, and growth remained stable from late fall to early spring. During the 12 mo of the grow-out, the shell size of the hardened/stunted oysters increased from 15.4-74.2 mm, and tissue weight increased from 0.49-12.85 g. Histological analysis revealed that gametogenesis of hardened/stunted oysters commenced as early as February when water temperature remained at 10 degrees C, and spawning occurred from July to September when water temperature reached 25-27 degrees C. DTA assessed from histological analysis was higher from September to February, when the chlorophyll a level in the bay was lower. These data suggest that seasonal fluctuations in water temperature and food availability in the water column are the 2 main environmental parameters governing reproduction and growth of oyster in Gamakman Bay, and DTA could be a useful biomarker for monitoring the nutritional condition of oysters.
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2010-01-01
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Aquatic Health Sciences Peer-Reviewed Articles, Oyster; Crassostrea Gigas; Hardening; Reproduction; Digestive Tubule Atrophy; Gamakman Bay; Korea
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Virginia Institute of Marine Science
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https://doi.org/10.2983/035.029.0418