Calamus
Calamus is a genus of marine fish in the family Acropomatidae. They are known for their elongated bodies and distinctive, often colorful, patterns. These fish are commonly found in shallow waters, particularly coral reefs and rocky areas, in tropical and subtropical regions around the world. While they are often referred to as “squirrelfishes” due to their appearance and nocturnal habits, they are not closely related to the true squirrelfishes in the family Holocentridae.
Common Names
Calamus species are known by a variety of common names, including:
- Squirrelfish
- Sea Perch
- Flagtail
- Sweetlips
Characteristics
Calamus fish exhibit several distinctive features, including:
- Elongated Body: They have a slender, elongated body shape, typically with a compressed profile.
- Large Eyes: Possessing large, prominent eyes, which are adapted for vision in low-light conditions.
- Small Mouth: Their mouth is relatively small and usually equipped with small, brush-like teeth.
- Coloration: The coloration of Calamus species varies, with many exhibiting vibrant colors and patterns, often with bands, spots, or stripes.
- Spines: They have sharp spines on their dorsal, anal, and pelvic fins, which serve as a defense mechanism.
- Nocturnal Habits: Calamus fish are primarily active at night, feeding on small crustaceans and invertebrates.
Environments
Calamus species are typically found in coastal waters, often in areas with abundant coral reefs and rocky outcrops. They prefer shallow, inshore habitats, but can also be encountered in deeper waters. Their distribution extends across tropical and subtropical regions, including the Indo-Pacific, Atlantic, and Caribbean.