Long-term mild hypoxia does not reduce thermal tolerance or performance of the freshwater prawn Macrobrachium tenellum

Nelly Tremblay, Marcelo García-Guerrero, Fernando Díaz, Claudia Caamal-Monsreal, Gabriela Rodríguez-Fuentes, Kurt Paschke, Paulina Gebauer, Carlos Rosas

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The present study was designed to assess the performance of the freshwater prawn Macrobrachium tenellum in optimal and sub-optimal dissolved oxygen conditions, considering increasing environmental pressures. Thermal tolerance and thermal metabolic scope (TMS) with related integrated biomarker response (IBR) were measured in prawns exposed to normoxia (80% air saturation), mild (40% air saturation) and severe hypoxia (25% air saturation) at three exposure time points (10, 20 and 30 days). Effects of hypoxia on thermal tolerance were not detectable over time; they were perhaps masked by hyperventilation, or by an increase or diversion of haemolymph processes. After 30 days, TMS was 11% higher in mild hypoxia compared with normoxia, while it was 64% lower in severe hypoxia, indicating the loss of aerobic metabolism capacity during the latter. Mild-hypoxia prawns maintained a high IBR over time, supported by antioxidant enzyme activities (mainly superoxide dismutase), which helped avoid the serious oxidative damage (proteins and lipids) seen in severe hypoxia animals, as well as lower acetylcholinesterase activity that indicated failure of communication between the nervous and locomotor systems. Our results documented a high tolerance by M. tenellum to mild-hypoxia events, which should be further tested under seasonal and extreme habitat/tank temperatures.

Original languageEnglish
Pages (from-to)63-74
Number of pages12
JournalAquaculture Research
Volume53
Issue number1
DOIs
StatePublished - Jan 2022

Keywords

  • cell stress markers
  • critical thermal limits
  • metabolic scope
  • metabolites
  • oxygen consumption

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