User:Tracha3/Arapaima gigas

Development in air-breathing Arapaima gigas evolved around 67 times, which is why they vary in physiology. They undergo the transition of water-breather to air-breather in 9 days post hatch. Physiology relocation of the gills to the kidney during air-breathing transition and the kidney also becomes enlarged. "In A. gigas the kidney most likely plays an important role ion and pH regulation." Once changes in gills take place the lamella is less recognizable due to physiology changes. The lamella is no longer visible, and the gills consists of what appears to be smooth, column-shaped filament. This action is non-reversible and as the species increase in size the pH is better balanced and it is more ion-regulated with development.