Don Ira Feinberg is one of the supporting, but semi, antagonists of Shark Tale.
In Shark Tale
He is first seen singing a song at the restaurant of the Titanic about one of Lino's sons in the film.
Don Ira(singing): I am the eagle, if you are the wind….
Lino: Thank you for singing for Frankie.
Don Ira(ignoring Lino): That one's finished. Any requests, anyone? How about the Titanic song?
Audience sharks: Please, don't!!
Don Ira seemed to have a slight self-confident side, as it is shown when he asked the audiences whether he'll sing another song such as the Titanic theme(since they were staying inside the shipwreck), while ignoring the audience sharks' complaints of dissent.
Don Feinberg is a slender, old leopard shark.