heres what i have read about them:
Scientific name: Atractosteus spatula
Price: £10-£25 for a baby
Size: potentially up to 3m/10' in the wild
Notes:
Gars have unusal scales which preventy the body from flexing much. This means that they are not very bendy and they need an extra wide aquarium to allow them to turn around comfortably. You will need a large indoor pool to keep one properly. Outgrows most aquaria