It was his nickname at Notre Dame, for some reason. He got it from preying upon weak secondaries (like a shark), if I'm not mistaken. I thought it was because with his nose that, from a profile view, he looks like a shark. Wade is correct. His teammates gave it to him as a poking-fun kind of thing. Samardzija was nicknamed Shark because of his resemblance to the animated Shark character on Finding Nemo (more on this below). In an interview to NBC, Samardzija himself said it all started on his freshman year at ND. He was new on the baseball team and out of nowhere they called him 'Shark'. It started during a game while he was pitching and they yelled at him from the dugout. Then Coach Paul Mainieri picked it up and it just snowballed from there. The funny thing is the actual representation of his character was not the one from Finding Nemo, but instead the one from Shark Tale; Lenny. http://us.movies1.yimg.com/movies.yahoo.com/images/hv/photo/movie_pix/dreamworks_skg/shark_tale/jack_black/jack_black1.jpghttp://graphics8.nytimes.com/images/2007/02/19/sports/190-jeff.jpg