Macruridae is a family of marine fishes that includes many species commonly referred to as rattails or grenadiers. However, there are several other names that can be used to describe these bottom-dwelling creatures, including roughies, whiptails, and deep-sea perch. The term "grenadier" is widely used for these fish because of their elongated body shape and pointed snouts, resembling the muskets used by the soldiers known as grenadiers. Another synonym for macruridae is "ocean pout," a name that comes from the French word "pot," meaning a fish or eel that is fat and fleshy. Whether you call them rattails, roughies, or whiptails, these deep-sea fish are fascinating creatures with unique adaptations for living in one of the harshest environments on Earth.