All depends on the size and the species the smaller ones Dwarfs when small bloodworms then on to red worm then cut up prawn river shrimps mussels lob worms then white bait then when I had the 2 big ones it was pike dead baits smelts roach very rarely fed them feeders later in life the stewartii I have at the moment is proving a pain and like a guppy or two.
beefheart,prawms,mussels, gambusias, goldfish,chiken and today tryed squid for my big striata . my baby marulius only prawms ,small peaces of beefheart and also some squid today