Simplify the following text for a Grade 6 native English-speaking person.
Original: The Atlantic sturgeon ( Acipenser oxyrinchus ) is a member of the Acipenseridae family and is among one of the oldest fish species in the world .
Simplified: The Atlantic sturgeon ( Acipenser sturio ) is a member of the Acipenseridae family . It is one of the oldest fish species in the world .