Definition: "Aplanobacter" refers to a genus of bacteria that can be found in certain marine environments such as the Pacific Ocean. This genus primarily causes diarrhea and other gastrointestinal issues, often due to overgrowth or inappropriate antibiotic treatment. The "Aplanobacter" name comes from a Greek word meaning "fish" or "crustacean," indicating it is often used by scientists to describe fish-like organisms found in water bodies like the Pacific Ocean.