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Rachycentron canadum, commonly known as the cobia, is a species of fish belonging to the family Rachycentridae. Here are some key characteristics and information about Rachycentron canadum:

1. Physical Appearance: Cobia have a streamlined and elongated body with a broad, flattened head. They are typically brown to dark gray in color on their upper body, fading to a lighter shade on the sides and belly. They have a distinctive elongated dorsal fin and a prominent lower jaw that extends past the upper jaw.
2. Size: Cobia are known for their large size and can grow up to 2 meters (6.6 feet) in length and weigh over 68 kilograms (150 pounds). They are one of the largest fish in the family Rachycentridae.
3. Distribution: Cobia are found in warm-temperate to tropical waters worldwide. They are commonly found in the Atlantic Ocean, ranging from the eastern coast of the Americas (including the Gulf of Mexico and Caribbean Sea) to Africa and Europe. They are also found in the Indo-Pacific region, including the waters around Australia and Southeast Asia.
4. Habitat: Cobia are pelagic and can be found in a variety of habitats, including coastal waters, estuaries, and offshore reefs. They are often associated with structures such as shipwrecks, buoys, and floating debris, where they find shelter and prey.
5. Behavior: Cobia are fast-swimming predators that feed on a variety of prey, including fish, crustaceans, and cephalopods. They are known to follow larger marine animals, such as sharks, rays, and sea turtles, to scavenge on scraps or feed on associated fish species.