Apprentice Peter G. Fiato, who has four victories in the early days of the Bowie meeting, leads the jockeys' standings at the track. Fiato, son of a former jockey, is attempting to follow in the footsteps of Donald Miller, Paul Nicol and Alberto Delgado as top apprentice on the Maryland circuit.

The native of Northampton, Mass., can weigh in at 107 and is handled by agent John Wilkie. He will get an opportunity to ride for trainers Ron Alfano and Richard Delp.

Fiato said yesterday: "I've been riding in races for only six weeks, but I've been getting on horses for years. I think I'm ready." His apprentice allowance will be in effect until May 9, 1984.

Jockey Alberto Delgado has severed connections with his contract trainer, Jack Wheeler, following a successful two-year association. Delgado will be replaced as Wheeler's first-string rider by Mark Slaven, who was impressive at Bowie on opening day when he scored with longshot Last Riddle.

Trainer Bill Boniface is considering an invitation for Preakness champion Deputed Testamony to run in the Super Derby at Louisiana Downs this fall.

Pimlico finished its 76-day meeting with declines of 4.5 percent in attendance and 1.2 percent in the betting. King T. Leatherbury edged out Tom Caviness for the trainer's title, 43-40, and jockey Paul Nicol beat his nearest rival, Donald Miller, 109-61.