Needlefish are fast-swimming predators that feed on small fish and crustaceans. They are often found near the surface of the water, where they can leap out of the water to catch their prey. They are also capable of swimming at high speeds and jumping long distances out of the water, sometimes accidentally injuring people in the process.
In some cultures, needlefish are considered a delicacy and are consumed by humans. However, they can be potentially dangerous due to their sharp beaks and the risk of accidental injury from their jumping behavior.