Needlefishes

Needlefishes in Hawaii

Needlefishes are long, slender fish that usually swim just below the ocean surface. In Hawaii, they are called 'aha, meaning “cord.” The name fits their thin, stretched-out bodies and quick surface movement.

At least four needlefish species live in Hawaiian waters. They have pointed, needlelike beaks with sharp teeth, which they use to catch small schooling fish. Juvenile needlefish can look like tiny floating twigs near the surface.

Surface Hunters

Needlefishes feed mainly on small fish that gather near the top of the water. They swim fast, strike quickly and swallow prey whole. Their slim bodies help them blend with ripples, reflections and surface light.

They can also leap out of the water. This may help them escape predators or move quickly, but it can create a safety concern around boats, swimmers and divers, especially at night.

Night Light Safety

Needlefishes may be attracted to bright lights after dark. Divers should use caution in areas where needlefish are common and avoid shining lights directly at the surface. Large needlefish can cause serious puncture wounds if they leap toward a light.

If a needlefish injury happens, clean the wound promptly and seek medical care for deep punctures or if any beak fragments may remain. For most visitors, the best approach is simple: watch from a calm distance and avoid chasing or touching them. Related pages include the Hawaii fish guide, barracudas, jacks, trumpetfishes and cornetfishes and Hawaii beach safety tips.