lautnusantara.com The yellowtail fusilier (Caesio cuning) is one of the most striking and beautiful reef fish in the tropical waters of the Indo-Pacific. With its sleek, silvery-blue body and bright yellow tail, this fish often catches the attention of divers and underwater photographers.

1. Physical Characteristics

This fish has an elongated body with a smooth dorsal fin and a bright yellow fork-shaped tail—the characteristic that gives it the name "yellowtail." It can grow up to 40 cm in size, although it is generally found in smaller sizes.

2. Habitat and Distribution

The yellowtail fusilier generally lives in shallow waters around coral reefs, especially at depths of 5–30 meters. They are widely distributed from the Red Sea and Indian Ocean to the western Pacific Ocean, including Indonesia, the Philippines, and Australia.

3. Social Behavior

This fish lives in large groups and is known to be very active in the water column. They are plankton eaters that are often seen filtering seawater with their mouths open. Their synchronized swimming patterns create a stunning underwater scene.

4. Ecological Role

As plankton eaters, yellowtail fusiliers help maintain the balance of the marine ecosystem. They are also a food source for marine predators such as groupers and sharks.

5. Conservation and Threats

Although not yet an endangered species, overfishing and coral reef damage can disrupt populations

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