Prolonged heat waves reduce the condition index and alter the molecular parameters in the pacific oyster Crassostrea gigas

: The entire shellfish farming sector is negatively affected by heat waves. Predictive models show that while heat waves are not predicted to exceed 28°C in the northern Adriatic Sea over the coming decades, their duration will increase to periods of up to 30 days. Knowledge regarding the effects of...

Full description

Bibliographic Details
Published in:Fish & Shellfish Immunology
Main Authors: De Marco, Antonina, Baldassarro, Vito Antonio, Calzà, Laura, Giardino, Luciana, Dondi, Francesco, Ferrari, Maria Giulia, Bignami, Giorgia, Parma, Luca, Bonaldo, Alessio
Format: Article in Journal/Newspaper
Language:English
Published: 2023
Subjects:
Concave oyster
Condition index
Heat shock protein
Heat wave
Overexpression
Thermal stress
Pacific
Crassostrea gigas
Pacific oyster
Online Access:https://hdl.handle.net/11585/918240
https://doi.org/10.1016/j.fsi.2023.108518
Description
Summary:: The entire shellfish farming sector is negatively affected by heat waves. Predictive models show that while heat waves are not predicted to exceed 28°C in the northern Adriatic Sea over the coming decades, their duration will increase to periods of up to 30 days. Knowledge regarding the effects of heat waves on bivalves at physiological and molecular level is still limited. This study attempted to simulate what will happen in the future in Pacific oysters exposed to prolonged heat waves, assessing morphometric and physiological indices, and investigating the expression level of a number of genes, including the chaperone heat shock proteins HSP70, HSP72 and HSP90, and the factor P53. A state of stress in the heat wave-exposed animals was found, with loss of body weight and energy resources: despite showing a higher clearance rate, these animals were unable to absorb the nutrients required to maintain homeostasis, as well as demonstrating an alteration in hemolymphatic AST activity, total calcium and magnesium concentration. mRNA levels of all examined genes increased in response to thermal stress, with long-term overexpression, activating cell stress defense mechanisms and modulating the cycle cell. The results of this study indicate that heat waves affect oyster welfare, with consequences for the productivity of the sector due to the lack of salable products.

Similar Items