The Senegalese government has reportedly demanded €1.5m (£1.2m) in fines for its alleged illegal fishing in the exclusive 12-mile fishing zone on 23 December.
The ship's seizure has provoked a diplomatic row with the Russian government, which suggested Greenpeace had orchestrated the seizure of the trawler in retaliation for Russia's detention of the Greenpeace ship Arctic Sunrise in October 2013, following its activists' protest against Gazprom's oil drilling in the Arctic.