Gerres cinereus, also known by its common name yellowfin mojarra is a species from the family Gerreidae. The species was originally described by Johann Julius Walbaum in 1792, in the mullet genus Mugil, as 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.

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