My friends sold now,

Pets to some,

blue in me is the rarest colour you could ever see.

People eat me like sushi,

Even if we’re vomit green,

Or colours as beautiful as the sunset,

My looks are the same from birth to death

I’m almost extinct,

 water is where I live.

If i’m bitten i’ll regenerate my body,

I’m the favourite pet of Minecraft.

What am I ?