The yellowfin mojarra (Gerres cinereus) is a species mojarra in the family Gerreidae. The species was originally described by Johann Julius Walbaum in 1792, as part the mullet genus Mugil. They mainly inhabit salt and brackish waters, but will enter fresh water. The species displays an ability akin to gyroscopic stability, allowing it to remain in a remarkably static spatial position relative to the water flowing around it. Compared to other fish in this family, this species is listed as least concern on the IUCN red list. This species thrives in large numbers across its distribution. Their large abundance also makes them a great resource for commercial fisheries today. Although not in high demand, their distribution and availability in shallow coastal areas make them an easy target for fisheries. In Mexico, they generate approximately $9.5 million in revenue per year.

Description The family Gerreidae is a widely distributed and diverse group.