Blackfin Squirrelfish

Overview

The Blackfin Squirrelfish (Neoniphon opercularis) is a tropical marine fish widely distributed across the Indo-Pacific region. It is typically found inhabiting coral-rich areas, including reef flats, lagoons, and seaward reefs, where it lives either alone or in small groups.

Appearance

This species features a fusiform, compressed body with an iridescent silvery appearance, marked by dark red or black spots on each scale. It is easily identified by the distinct black coloration on the spinous portion of its dorsal fin, which also displays white tips and triangular white marks along the base. The fish has a strongly projecting lower jaw and reddish-yellow soft dorsal, anal, and caudal fins. A notable defensive feature is the large, venomous spine located at the corner of its preopercle.

Biology & behavior

Primarily nocturnal, the Blackfin Squirrelfish spends much of the daylight hours hiding in caves, under ledges, or among branching corals. When threatened, it may raise or flash its conspicuously marked dorsal fin to startle potential predators. It is a gonochoristic species that reproduces via external fertilization, scattering pelagic eggs into the open water without providing parental care. While it possesses venomous spines that can inflict painful wounds if mishandled, it is generally considered to have low vulnerability to fishing pressure and is classified as Least Concern by the IUCN.

Feeding

As a nocturnal forager, this squirrelfish emerges at night to hunt. Its diet consists primarily of benthic prey, specifically crabs and shrimps.