Michael joins the Bluefish for his first season with the team and sixth of professional baseball. After starting last year with the Cincinnati Reds Single-A and Double-A teams, he finished the season with the Washington Nationals Single-A squad in Potomac, Virginia. In 59 games with Potomac, the infielder compiled a .241 batting average with nine doubles, three home runs, and a .355 on base percentage.

Gilmartin started his career in the Oakland Athletics organization after they selected him in the 27th round of 2009 Amateur Draft out of Wofford College. He recorded his best season with Class-A Stockton in 2011, recording career highs in nearly every statistical category including 14 home runs, 71 runs scored, nine triples and 75 RBI. Over the course of 514 career minor league games, the 26-year-old owns a .247 batting average with 96 doubles, 38 home runs, 242 runs scored and 232 RBI.