help pls re wolffish not eating

hi guys i just acquired a wolf fish cpl days back bout 9-10 inches the bro i got it from said he had been trained to market prawns ... i also first timer to mp. been cutting off prawn heads and tails then slicking prawn and rinsing under water to defrost the wolfy still wont accept them ...any ideas suggestions please...i have ehard of wolfs being able to train on pellts if so which brand or at its size will it not be able to adapt? any info at all pls help i love my wolffish and if he keeps not eating i worried he gonna starve.... thanks guys
-cichlid fanatic