In order to study effects of chitosan on Fresh-keeping refrigerated fillets, fresh Ctenopharyngodon idellus were slaughtered and washed, then the Ctenopharyngodon idellus were divided into six treatment groups, and dipped in 0%(untreated), 1.0%, 1.5%, 2.0%, 2.5% and 3.0% chitosan solution for 5min, ...