The financial scandal - named after a 2019 Wikileaks release called the "Fishrot Files" - stretches from Namibia to Iceland, taking in government ministers and involving at least $20m.
Namibia is now preparing for the biggest corruption trial in its short history.
In the Fishrot scandal, a number of prominent politicians and businessmen are accused of running schemes to get control of valuable fishing quotas, for example, those held by the state fishing company Fishcor.
It is alleged that they then diverted them to the Icelandic fishing company Samherji in return for kickbacks.
Ten suspects, including former Fisheries Minister Bernard Esau and ex-Justice Minister Sakeus Shangala, are alleged to have benefitted.