Yellowfin Mojarra

Overview

The Yellowfin Mojarra is a common, silvery fish found throughout the Western Atlantic, ranging from Bermuda and Florida to Brazil. It is highly adaptable, inhabiting shallow coastal environments such as seagrass meadows, mangrove-lined creeks, and sandy reef channels, and it is known to occasionally enter brackish or fresh water.

Appearance

This species features a compressed, rhomboidal body with a pointed snout and a deeply forked tail. Its most distinguishing characteristics are the yellow pigment on its pelvic and anal fins and the six to seven faint, dark vertical bars often visible on the sides of adults. The mouth is highly protrusible, allowing it to extend forward and downward to feed.

Feeding

As a bottom-feeder, the Yellowfin Mojarra uses its specialized, extendable jaw to sift through sand and mud. It feeds primarily on benthic invertebrates, including small crustaceans, worms, and clams. When foraging, it is often observed thrusting its mouth into the sediment and expelling sand through its gill openings to extract prey.

Biology & behavior

The Yellowfin Mojarra is known for its ability to maintain a remarkably stable position in flowing water, a trait described as gyroscopic stability. While often seen in small groups or aggregations, they are generally approachable by divers and snorkelers. Younger individuals have been observed consuming a mix of plant material alongside small invertebrates like copepods and nematodes.