Growth performance of the longline-suspended Pacific oysters Crassostrea gigas on the coasts of Jeonnam, Korea
Sang-Jun Lee, Qtae Jo, Yong-Hyun Do, Sang Soo Kim and Young Chul Park
Aquaculture Division, South Sea Fisheries Research Institute, NIFS, Jeonnam 59780, Korea Southeast Sea Fisheries Research Institute, NIFS, Gyeongnam 53085, Korea Fisheries Resources and Environmental research Division, South Sea Fisheries Research Insti
Two provinces of Korea, Jeonnam (J-site) and Gyeongnam (G-site), take longline systems for the Pacific oyster Crassostrea gigas aquaculture. The two sites, however, differ in the system deployment and operation. We monitored growth performances of the two oysters from May to November, 2018, together with environmental variables in waters and sediments. J-site system was characterized by higher culture density and earlier seed load. In the comparison of growth performance, survivals were highly comparable, but growths differed. The earlier load of seeds in J-site made the oysters grow faster in first two months, particularly in shell length, shell width, and meat weight. The difference, thereafter, became clearly narrowed due to retarded growth in J-site, even though it was still statistically different at P < 0.05. Of all the environmental variables monitored, chlorophyll-a, dissolved oxygen, and suspended solid were less favorable for J-site oysters while still being remained in levels allowable for the oyster aquaculture. Higher culture density appeared to be an additional factor responsible for the retarded growth of J-site oysters. However, we might need further studies covering expanded years and locations to generate realistic information representing the oyster growth performance for each site.
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