Don Ira Feinberg is one of the minor characters of Shark Tale.
He is voiced by Peter Falk inside the film adaptation.
Don Feinberg first appeared as a singer at the restaurant inside Don Lino and his gang's Headquarters, while singing a song about Lino's deceased son Frankie. As he finished the song, Lino thanks him for his composition until another member, the hammerhead shark Giuseppe, comes and tells Lino that Lenny was missing.
Don Feinberg seemed to be another alpha of another gang of sharks that shared Lino's worries about Lenny's safety next to Lino's secretary Luca. He and Lino were very good friends, and it's possible that Feinberg also understands about the two young sharks. After that, the audience raised their cups to all honor the deceased one, and Lino thanks Feinberg for the song. Also, not only friendly with Lino, Ira seemed to have a slightly self-confident side, as shown that he ignored the audience sharks' complaints of dissent when he asked whether he'll sing the Titanic theme song.
Don Feinberg is the only other alpha known inside the film, and the only other alpha shark to have followers not only of leopard sharks, but also swordfish and orcas.