.... Scanning electron microscopy of the gill epithelium revealed no remodelling at a macro-level, but pronounced changes in surface morphology. Under normoxia,mitochondria-rich cells were exposed only through small apical crypts, and these decreased in number by 47% and in individual area by 65% during 3 h...

... of increased mucous production) but comes with an ionoregulatory cost, as indicated by a 10 and 15% reduction in plasma [Na + ] and [Cl – ],respectively, within 12–24 h of hypoxia. Within 12 h of hypoxia exposure, `wavy-convex'-mitochondria rich cells (MRCs) with large apical crypts and numerous branched...