An indictment charging six people and two companies was unsealed Tuesday.
Prosecutors say Reeves Brothers of Port Norris, N.J., over-harvested its quota between 2004 and 2009. They say the extra oysters had a value of more than $600,000.
Also charged was Harbor House Seafood in Seaford, Del. Authorities say that business helped the Reeves Brothers hide their catches and bought in more oysters than allowed from another fisherman as well.
The government says it seized six oyster boats as part of the investigation.
A woman who answered the phone at Harbor House said the company would have no comment Tuesday. There was no answer at Reeves Brothers.