Zadar IV was the inhabited fourth planet of its star system. This planet was the homeworld for a species of dolphins. Before stardate 41509, Starfleet oceanographer Lieutenant Harry Bernard, Sr. was stationed on Zadar IV with his son Harry Jr. They lived on the beach and Harry Jr. often saw dolphins playing in the ocean there. They were later the inspiration for his first attempt at sculpting. (TNG: "When The Bough Breaks" ) This planet was only mentioned in dialogue. According to the Star Trek: Star Charts ("United Federation of Planets I"), in 2378, Zadar IV was a Federation member.