Scientifically, it’s a fish known as Rutilus rutilus caspicus - a member of the carp family that lives in fresh and brackish water in Europe.
Forbes(Sep 19, 2014)
Originally the dictator was a patrician, but in 356 B.C. the plebeian Marcius Rutilus was called upon to fill the office of dictator.
Various, The New Gresham Encyclopedia—Volume...(2011)