Keeltail Needlefish

Overview

The Keeltail Needlefish (Platybelone argalus) is a slender, surface-dwelling marine fish recognized by its elongated, needle-like jaws and distinct physical features. It is widely distributed across tropical and subtropical waters in the Atlantic, Pacific, and Indian Oceans, where it is often found in small groups near shorelines and reefs.

Appearance

This species possesses an extremely elongated, cylindrical body that transitions from a greenish-blue color on the back to a bright, silvery white on the lower sides. Its most diagnostic feature is the presence of a broad, flat lateral keel on each side of the caudal peduncle, which helps the fish maintain balance. The jaws are exceptionally long, with the lower jaw significantly longer than the upper, both lined with small, sharp teeth.

Biology & behavior

Keeltail Needlefish are diurnal, oceanic pelagic hunters that typically occupy the upper few meters of the water column. They are known to be somewhat wary of divers and often school in sheltered areas of reefs or offshore. As an oviparous species, they produce eggs that feature specialized tendrils, allowing them to attach to floating objects or debris in the water. Their diet consists primarily of small fishes and crustaceans, which they capture using their elongated, spear-like jaws.