From the Back of the Book:
Still waters run deep....
The world called Tobibak lies slightly off the beaten track in Corridor Sector, a world 99% covered by ocean and overlooked by history for many centuries. When Humans came, it was to exploit, not to settle, but Tobibak was already inhabited—by a primitive intelligence mysteriously similar to another aquatic race from many light years away. TobiCorp exploited the natives as unpaid labor, using them to help mine the sea bottom and harvest the teeming schools of shrimp for sale offworld.
When a TobiCorp scientist discovered the truth, his conscience led him to expose the company's crimes and Tobibak was taken over by the Imperial Ministry of Colonization.