The man who laced frozen food with pesticide last fall at a subsidiary in Gunma Prefecture of seafood company Maruha Nichiro Holdings Inc. was sentenced Friday to 3½ years in prison.

Contract worker Toshiki Abe, 49, tampered with 22 products at a factory run by Aqlifoods Co. by spraying them with the pesticide malathion between Oct. 3 and Nov. 5, the Maebashi District Court said.

Abe has no plans to appeal, according to his lawyer, who met with him after the trial ended.