The multilevel responses of Acipenser baerii and its hybrids (A. baerii ♀ × A. schrenckii ♂) to chronic heat stress

Abstract The global warming profoundly impacts on fishes' survival by imposing a chronic heat stress condition, but the thermoregulation mechanism of fishes, especially for cold-water fishes, against chronic heat stress remains to be explored. In this study, we evaluated the thermal resistance of Acipenser baerii and its hybrids (A. baerii ♀ × A. schrenckii♂). In the analysis of cumulative survival rate (CSR) and histologic section, the hybrids showed higher survival rate and lower gill damage than A. baerii. Under the chronic heat stress, plasma cortisol and glucose levels were increased at different degrees in A. baerii and the hybrids. At the same time, oxidative stress markers (LPO, SOD, CAT, GSH-Px and GSH) levels, and the mRNA expression levels of heat shock proteins (HSP70, HSP90, GRP75 and HSC70) and inflammation factors (IL-1β and TGF-β) were also increased in A. baerii and the hybrids. Among these results, the increases were relatively higher in A. baerii at the early period (day 7) of heat stress, indicating that A. baerii is more susceptible to heat stress. In addition, the expression levels of HSP70 protein were greatly increased in A. baerii, in support of the low survival ability of A. baerii under chronic heat stress. Our study provides a direct evidence to prove the outstanding thermal resistance of the hybrids, and also contributes to understand the coping strategy of cold-water fishes to chronic heat stress.

• Publication year

  2021

• Venue

  Aquaculture

• Publication date

  2021-04-16

• Fields of study

  Biology, Environmental Science

• Identifiers
  DOI 10.1016/J.AQUACULTURE.2021.736773
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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