Yellowfin Mojarra

The family Gerreidae is a widely distributed and diverse group. The family includes over 50 different nominal species. Frequent confusion exists between the varying species in the Gerreidae family, but the Yellowfin mojarra's morphology can give insight into its distinguishing features. The body of the Yellowfin mojarra follows a compressed, slim shape with a dorsal profile that is uniformly convex. Their jaws protrude slightly and have terminal mouth structures. They are identified through their stark silver color on their body with no dark stripes along their scales. They do, however, have about 6 to 8 vertical bars on their sides. The spinous dorsal, pelvic, and caudal fins have a deep yellow or golden color, but all other fins are darker in color. Covering most of the body are the thin, overlapping ctenoid scales that contribute to their silver-like appearance.

Yellowfin mojarra inhabits many places along the western coasts of Southern America and parts of Northern America. Gerres cinereus distribution geologically. Specifically, variations of Yellowfin can be found around the Gulf of Mexico, the Caribbean, Rio de Janeiro, Baja California, Peru, and the Galapagos Islands. They like tropical and subtropical coastal waters but have been reported in some freshwater environments as well. The shallow waters, usually between 1 and 15 meters, are where these fish tend to roam. Sandy bottoms, coral reefs, mangrove zones, and seagrass beds are where they hunt and reside. These fish excel in shallow brackish waters that have plenty of prey and places to camouflage. Atlantic and Pacific yellowfin mojarra, although they are the same species, tend to have non-overlapping ranges.

The morphological features of the Mojarras' bodies make them efficient in their natural environment. Its slender and compressed body and forked tail enhances its swimming efficiency, allowing it to move quickly. This makes it easier to navigate in estuarine or shallow turbid coastal waters where mobility is more advantageous. The terminal, slightly protruding mouth aids in feeding. Worms, clams, crustaceans, and other small fish are often in their diets, although plant detritus was found to make up 74.9% of their diet on average. On top of this, their mouth protrusion allows them to push their snouts into the sand to capture invertebrates. Their terminal mouth shape allows them to hunt both in the lower to middle water column and in the benthic zone. Because of their more generalized diets, the Yellowfin Mojarra is adapted to many diverse environments.