sentences:  It was once thought that pufferfish held their breath in order to display this behavior.A 2014 study, however, found that oxygen consumption actually increases while fish are inflated.It had been previously understood that respiration through the gills ceased during inflation while cutaneous respiration increased, but this study found that cutaneous respiration is nearly nonexistent, and oxygen intake through the gills is almost five times higher than normal while "C. valentini" is inflated.