Changes in Carbohydrates and N-Acetylglucosamine (Glcnac) In Response to an Experimental Increase of Temperature in Tissues of Two Oyster Species, the Temperate Introduced Crassostrea Gigas and the Native Tropical Crassostrea Corteziensis

• Published in: Aquaculture & Fisheries
• Main Authors: Rodríguez-jaramillo, Carmen, García-corona, José Luis, Estrada, Norma, Palacios, Elena
• Format: Article in Journal/Newspaper
• Language: English
• Published: HSOA 2023
• Subjects: Carbohydrates; GlcNAc; Introduced oysters; Native oysters; Reproduction; Summer mortality; Thermal stress; Crassostrea gigas
• Online Access: https://archimer.ifremer.fr/doc/00834/94620/102015.pdf; https://doi.org/10.24966/AAF-5523/100056; https://archimer.ifremer.fr/doc/00834/94620/

The present study evaluates the presence and location of carbohydrates in general, and the monosaccharide N-acetylglucosamine (GlcNAc) on tissues of temperate oyster Crassostrea gigas and tropical oyster C. corteziensis during an increase in temperature during reproduction, a stress which is probably one of the main causes of the oyster’s summer mass mortality events. Adult oysters from both species were placed at 22 °C and exposed to a gradual increase in temperature (1 °C day-1) until reaching 34 °C. The values of the GlcNAc index were higher in C. corteziensis compared to C. gigas in the gonads, vesicular connective tissue and digestive gland of males and females during the experiment, except for the hemocytes in the gonads, where the GlcNAc index was significantly highest in C. gigas at 34 °C. A PCA revealed an inverse association between GlcNAc in tissues (gonad, digestive gland, and vesicular connective tissue) and GlcNAc in hemocytes for females and males. The present study shows evidence that water temperature increase affects the overall immune system capability and hemocyte-tissues signaling function, with deep differences between C. gigas and C. corteziensis, particularly in females. This information provides valuable insights for further studies into the immunological mechanisms of oyster summer mortality events.