Freddi Fish 4: The Case of the Hogfish Rustlers of Briny Gulch is a 1999 video game and the fourth of five adventure games in the Freddi Fish series of games. It was developed and published by Humongous Entertainment. As the game opens, Freddi and Luther are on their way to Calico Ranch in the Gulf of Mexico to meet Freddi's cousin, Calico Catfish, who agreed to teach them to raise hogfish. When they arrive, Cousin Calico tells them that her prized hogfish herd had been rustled (which in Calico's way means "someone came in and took them without asking", in other words stealing). Calico couldn't call the authorities as the Sheriff was possibly out of town. Freddi and Luther offer to help find the hogfish and catch the rustlers. After heading into Briny Gulch, the two detectives meet Saltwater Stella, the owner and operator of the local sodaloon. She tells them that two suspicious characters entered the sodaloon the other day. While investigating, Luther finds a note dropped by the rustlers. It mentions a meeting at the Rusty Rustler, a local shipwreck, at high tide. When they arrive at the wreck, they enter the combination code from the note to the hatch entrance and succeed to pry open the entrance. Freddi hears the hogfish grunting from inside. A rustler, the slim fish, stops them from entering and mentions that the hideout is for rustlers only. The rustlers are seriously fashion-cautious, so they won't accept Freddi and Luther until they have the proper attire. Using the magazine advertisement the rustler gave them, Freddi and Luther then set out to find materials for making rustler disguises.