A fire at The Fish Market restaurant on the Embarcadero caused an estimated $1.2 million in damage Wednesday night, a fire official said. The grease fire started in the kitchen hood vent system in the attic, said Lee Swanson, spokesman for the San Diego Fire-Rescue Department. It was reported about 6:20 p.m. About 160 patrons and 75 employees were in the restaurant at the time, said port spokeswoman Tanya Castaneda. The popular restaurant, which is a port tenant, is located on San Diego Bay near the USS Midway.