Charles Marcus Breder (1897-1983) was an ichthyologist who held curatorial and directorial positions at the New York Aquarium and the American Museum of Natural History, including the Museum’s Lerner Marine Laboratory. His repute rests in part on work in fish behavior, including locomotion, and prodigious writing. Throughout his career he undertook fieldwork within the Americas. Breder died at age eighty-six on October 28, 1983, in Englewood Hospital, Florida.