Hyperoxia does not improve the acute upper thermal tolerance of a tropical marine fish (Lutjanus apodus).

ABSTRACT: Fish can experience hyperoxia in shallow environments due to photosynthetic activity and this has been suggested to provide them with a metabolic refuge during acute warming. However, this hypothesis has never been tested on a tropical marine species. Thus, we fitted 29°C-acclimated wild schoolmaster snapper (Lutjanus apodus; a species known to experience diel hyperoxia in mangrove creeks and coastal waters) with Transonic® flow probes and exposed them to an acute increase in temperature (at 1°C h-1) in respirometers under normoxia and hyperoxia (150% air saturation), until their critical thermal maximum (CTmax). The CTmax of both groups was ∼39°C, and no differences in maximum cardiac function were recorded as the fish were warmed. However, temperature-induced factorial aerobic scope was

SUBMITTER: Sandrelli RM 

PROVIDER: S-EPMC11574356 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature