User:Tracha3/sandbox

Morphology changes occur as Arapaima gigas undergoes the transition from water-breather to air-breather 8-9 days post-hatch. During this air-breathing transition, the structure of the gills change, making them better adapted for ion absorption but less able to undergo gas diffusion. Once developmental changes in the gills take place, the lamella is less recognizable. The adult gills are made up of smooth, column-shaped filaments instead. These actions are non-reversible and explain why the species is an obligate air breather. The kidneys have an important role in nitrogenous waste excretion in this species and are enlarged in adult fish.

I plan to make a new physiology section and add it right under the distribution section.