The Ranchu is a popular variety of goldfish known for its rounded body and lack of a dorsal fin. Originating from Japan, this fish is characterized by its unique shape, which resembles a small, plump ball. Ranchus come in various colors, including orange, red, and calico, making them visually appealing to aquarists. Ranchus are typically kept in aquariums or outdoor ponds and require proper care to thrive. They prefer a well-maintained environment with clean water and adequate filtration. Due to their body shape, they may be more susceptible to certain health issues, so monitoring their diet and water quality is essential.