Shubhankar Nayak, the alleged middleman was arrested by the agency late in the evening, a CBI official said.
"In the Odisha chit fund case, CBI has arrested Subhankar Nayak on the basis of documents seized from his residence which prima facie shows nexus with Seashore company for channellisation of funds," the official said.
The agency carried out search operations in Delhi and Mumbai besides 16 locations in Odisha. These included the residence of Rajya Sabha MP from Odhisa Pyarimohan Mohapatra in Delhi and Bhubaneswar and two retired IAS officers -- PK Hota and S C Pattnaik from the state, the sources said.
In Bhubaneswar, Mohapatra told reporters, "I welcome the CBI's search at my residence. They (CBI team) searched my residence this morning and have taken away some documents including my bank pass book, property records, party documents and others."
Claiming that he had no link with any ponzi scheme companies, Mohapatra said he would cooperate with CBI to unearth the truth.
The MP had earlier admitted that he had met Seashore Group CMD Prashant Dash, who is now in jail.
"I had met him (Dash) when he came to my house and proposed to set up a maize processing unit in Nabarangpur district. Then he (Dash) came to my house for the second time to invite me to a function.
