Cambarus cryptodytes, the Dougherty Plain cave crayfish or Apalachicola cave crayfish, is a small, freshwater crayfish endemic to Florida and Georgia in the United States. It is an underground species known only from waters associated with the Floridan aquifer.
If I was to fish in any common water way in Florida and Georgia, I would not catch a Cambarus cryptodytes.
According to the context, Cambarus cryptodytes are not found in common water ways, only underground. Therefore, If i were to fish in a common water way, I would not catch one.