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<p>This study investigates how contrasting oceanographic environments influence the biochemical composition of Pacific oysters (<i>Crassostrea gigas</i>), with particular emphasis on the interacting roles of hydrodynamics, salinity regimes, and phytoplankton community structure. Diploid and triploid oysters were cultured in three environments: a high-energy open-water (HEO) site characterized by strong tidal currents and high water exchange, a sheltered southern coast bay, and a land-based brackish pond used for post-harvest finishing of HEO-reared oysters. Phytoplankton analysis revealed a diatom-dominated assemblage at the HEO site, while the pond environment was enriched with flagellates and cryptophytes, under reduced salinity conditions. These contrasting physical and biological characteristics were reflected in oyster tissues: oysters from the HEO site exhibited the highest taurine concentrations, while southern coast oysters showed relatively higher levels of other free amino acids, including glutamic acid and alanine. Fatty acid profiles revealed enrichment of docosahexaenoic acid (DHA) in oysters from both the HEO and pond systems, reflecting cumulative assimilation and selective retention of diatom-derived lipids originating from the HEO rearing phase under contrasting hydrodynamic and salinity regimes, while eicosapentaenoic acid (EPA) was higher in southern coast oysters. Together, these findings suggest that hydrodynamics and salinity shape oyster biochemical responses in part through differences in phytoplankton availability/composition, feeding conditions, and metabolic allocation, highlighting the integrated influence of oceanographic drivers and cultivation history on the nutritional quality of marine bivalves.</p>

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Biochemical Responses of Pacific Oysters (Crassostrea gigas) to Contrasting Oceanographic Environments: Implications of Hydrodynamics, Salinity, and Phytoplankton Communities

  • 期刊论文

  • 发表日期：

    2026年4月22日

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  • Kyung-Il Park,
  • Soohwan Kim,
  • Seung-Hyeon Kim,
  • Jong-Deok Choi,
  • Hye-Mi Lee,
  • H. M. V. Udayantha,
  • Yu Chen,
  • S. D. N. K. Bathige

摘要

This study investigates how contrasting oceanographic environments influence the biochemical composition of Pacific oysters (Crassostrea gigas), with particular emphasis on the interacting roles of hydrodynamics, salinity regimes, and phytoplankton community structure. Diploid and triploid oysters were cultured in three environments: a high-energy open-water (HEO) site characterized by strong tidal currents and high water exchange, a sheltered southern coast bay, and a land-based brackish pond used for post-harvest finishing of HEO-reared oysters. Phytoplankton analysis revealed a diatom-dominated assemblage at the HEO site, while the pond environment was enriched with flagellates and cryptophytes, under reduced salinity conditions. These contrasting physical and biological characteristics were reflected in oyster tissues: oysters from the HEO site exhibited the highest taurine concentrations, while southern coast oysters showed relatively higher levels of other free amino acids, including glutamic acid and alanine. Fatty acid profiles revealed enrichment of docosahexaenoic acid (DHA) in oysters from both the HEO and pond systems, reflecting cumulative assimilation and selective retention of diatom-derived lipids originating from the HEO rearing phase under contrasting hydrodynamic and salinity regimes, while eicosapentaenoic acid (EPA) was higher in southern coast oysters. Together, these findings suggest that hydrodynamics and salinity shape oyster biochemical responses in part through differences in phytoplankton availability/composition, feeding conditions, and metabolic allocation, highlighting the integrated influence of oceanographic drivers and cultivation history on the nutritional quality of marine bivalves.