Lisa M Robertson, Daiani Kochhann, Adalto Bianchini, Victoria Matey, Vera F Almeida-Val, Adalberto Luis Val, Chris M Wood
In the traditional osmorespiratory compromise, fish increase their effective gill permeability to O2 during exercise or hypoxia, and in consequence suffer unfavorable ionic and osmotic fluxes. However oscars, which live in the frequently hypoxic ion-poor waters of the Amazon, actually decrease ionic fluxes across the gills during acute hypoxia without changing gill paracellular permeability, and exhibit rapid paving over of the mitochondrial-rich cells (MRCs). But what happens during prolonged exercise? Gill paracellular permeability, ionic fluxes, and gill morphology were examined in juvenile oscars at rest and during aerobic swimming...
October 2015: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology